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Defensible space: the landscaping rules fire codes impose

Plant, mulch, fence and clearance rules in 11 fire-country states and 6 local codes, with the legal status of each 5-foot zone.

Updated September 2026 · Data as of Statutes and ordinances retrieved September 5, 2026

Written by HyreYard Research Desk Primary-source research, data analysis and fact checking

11 fire-country states read at the statute 7 with no statewide clearance statute found
6 municipal overlays cited by section LA County, City of LA, Boulder city and county, Truckee, Austin
Pending California Zone 0, not yet in the CCR Board vote Aug. 19, 2026; OAL file 2026-0828-03E

The finding

California is the only state in this table that puts a defensible-space duty on existing homes: 100 feet, or to the property line, under PRC § 4291 and Gov. Code § 51182.

Its 5-foot ember-resistant “Zone 0” is in statute but not yet in the regulations as of September 5, 2026. Colorado, Oregon and Utah work through construction or model codes. For Washington and six other states we found no statewide yard rule. Austin, Boulder and Truckee already enforce a 5-foot zone.

Read these limits first

Not legal advice. Defensible-space duties sit at four levels: state statute, state administrative code, municipal fire code and insurance guideline, and the stricter one can govern. A row is what we read on the retrieval date. Confirm the parcel with the local fire authority.

Stay away from power lines. Never trim or clear vegetation near a line yourself: call the utility, which is responsible for line clearance (see Los Angeles County Fire Code § 325.1.1). This page does not tell anyone to fell or climb a tree, run a chainsaw, or clear brush on a red-flag day.

HyreYard does not landscape, inspect yards or pull permits. Our company files cover seven states and are not an inspection log. Roofs and insured losses belong to our sister sites; this page covers the landscaping clearance rule.

WUI is not coverage. 44,100,000 houses sat in the conterminous-US wildland-urban interface in 2020: 32% of US housing on 9.4% of the land (Radeloff et al., Science 2023). That is a geographic fact, not the number of households under a defensible-space rule.

When we checked, and what can change

Published September 5, 2026. Last verified September 5, 2026. Next review December 5, 2026, or sooner if OAL publishes the Zone 0 package, CAL FIRE changes its inspection forms, Utah’s 2024 IWUIC takes effect, or Washington finalizes its DNR hazard maps.

Primary sources: Pub. Resources Code § 4291; Gov. Code § 51182; 14 CCR § 1299.03; Board of Forestry emergency package 2026-0828-03E; 2025 Colorado Wildfire Resiliency Code; OAR 837-040-0030; RCW 19.27.560.

Update trigger: an OAL decision on file 2026-0828-03E; Secretary of State filing; a State Fire Marshal appropriation finding under PRC § 4291(h); local CWRC compliance reports; a new IWUIC edition adopted by a state in this table.

A date on this page is a retrieval date, not a claim that the rule is stable. California has been writing its Zone 0 rule since AB 3074 in 2020. Read the status column before acting on a row.

What is a defensible space zone?

“Defensible space” is the buffer a fire code requires between a building and the plants, mulch, fences and stored fuel that could carry fire to it.

The familiar diagram (Zone 0 at 0–5 feet, Zone 1 at 5–30, Zone 2 at 30–100) is a teaching template, not a statute.

California’s administrative code still uses two zones: Zone 1 from the structure to 30 feet and Zone 2 from 30 to 100, both capped at the property line (14 CCR § 1299.03). The 5-foot ember-resistant band is a third zone the Legislature added in 2020 (AB 3074) and has not yet specified in regulation.

The International Wildland-Urban Interface Code, which Utah, Nevada’s fire marshal, Oregon’s model code, Austin and Boulder draw from, does not use “Zone 0.” IWUIC Table 603.2 sets one fuel-modification distance by hazard class (Moderate 30 ft; High 50 ft; Extreme 100 ft) and regulates trees, groundcover, firewood and LP-gas inside it.

HyreYard analysis. One 0 / 5 / 30 / 100 diagram hides three questions a homeowner can act on: which rule applies to the parcel, whether it covers existing yards or only new permits, and what it says about the first five feet, where embers land.

Is California’s Zone 0 rule in force?

Zone 0, also called the ember-resistant or immediate ignition zone, is the band against the structure. Ember research, including IBHS’s, points to the first five feet as where embers collect against siding, under decks and at a fence base. That is a research point, not an ordinance.

California statute. Public Resources Code § 4291(a)(1)(A), as amended by AB 1455 (effective October 13, 2025), requires 100 feet of defensible space in the State Responsibility Area.

The section continues: “with more intense fuel reductions being utilized between 5 and 30 feet around the structure, and an ember-resistant zone being required within 5 feet of the structure, based on regulations promulgated by the board.”

Government Code § 51182 says the same for occupied dwellings in locally designated Very High Fire Hazard Severity Zones. For Zone 0, a structure includes an attached deck (PRC § 4291(i); Gov. Code § 51182(e)).

California regulation, September 5, 2026. The Board of Forestry and Fire Protection voted on August 19, 2026 to adopt emergency regulations adding 14 CCR §§ 1298.01–1298.04 (Local Responsibility Area VHFHSZ) and amending §§ 1299.01–1299.03 (State Responsibility Area).

The package went to the Office of Administrative Law on August 28, 2026 as file 2026-0828-03E, “Zone 0 Defensible Space.” Comments closed September 2, 2026. As of September 5, 2026 we found no OAL approval and no Secretary of State filing. 14 CCR § 1299.03, the rule CAL FIRE inspects against, still defines two zones.

The statute adds its own delays. PRC § 4291(g)(1) says the ember-resistant-zone requirement “shall not take effect for new structures until the board updates the regulations… and the guidance document.” Subsection (g)(2) adds three years for existing structures.

Subsection (h) bars CAL FIRE from changing inspection practices or forms until the State Fire Marshal finds the Legislature has funded it. A Board vote does not end that chain.

HyreYard analysis. Selling “California Zone 0 compliance” as a current statewide duty gets ahead of the regulations. Calling Zone 0 imaginary ignores a statute that has required it since 2020, the Board’s August 2026 vote and local ordinances already in force.

The accurate version: the duty is in statute pending regulation; the regulation is with OAL; the rule inspectors use today is still Zone 1 and Zone 2.

11 fire-country states, read at the statute

JurisdictionStatewide statusZone 0 / 0–5 ftCitation
California (statewide) · sourceIn forceStatute yes; CCR noPRC § 4291; Gov. Code § 51182; 14 CCR § 1299.03
Oregon (statewide) · sourceModel, local opt-inIn the model codeORS 476.392 as amended by SB 83 (2025); OAR 837-040-0030 (OSFM 2-2026, effective Apr. 29, 2026)
Washington (statewide) · sourceNo statewide statute foundNone foundRCW 19.27.560 (ESB 6120, 2024); chapter 51-55 WAC (sections reserved)
Colorado (statewide) · sourceNew constructionNew work onlySB 23-166; C.R.S. §§ 24-33.5-1236 to 1237; 8 CCR 1507-39; 2025 Colorado Wildfire Resiliency Code (effective July 1, 2025)
Utah (statewide) · sourceIn forceLocal onlyUtah Code § 15A-2-103; 2006 Utah Wildland Urban Interface Code (in force until Jan. 1, 2027); H.B. 41 (2026) adopts the 2024 IWUIC effective Jan. 1, 2027; H.B. 215 (2026) landscaping preemption in designated WUI
Nevada (statewide) · sourceNo statewide statute foundGuidance onlyNevada SFM Wildland-Urban Interface Code 2018 (IWUIC 2018 as published by the State Fire Marshal); no statewide homeowner landscaping-clearance statute found as of Sep. 5, 2026
Arizona (statewide) · sourceNo statewide statute foundGuidance onlyNo statewide defensible-space statute found as of Sep. 5, 2026. UA Cooperative Extension (az1290, az1416, Firewise Landscapes) and Arizona Department of Forestry and Fire Management publish guidance. Cities, counties and fire districts adopt IWUIC or local "survivable space" ordinances (e.g. Pinetop-Lakeside Town Code § 17.96.070).
New Mexico (statewide) · sourceNo statewide statute foundGuidance onlyNo statewide defensible-space statute found as of Sep. 5, 2026. 2025 SB 33 directed a task force to develop standards for building codes and defensible space, including a noncombustible five-foot zone; that is a study mandate, not an enforceable clearance rule. EMNRD Forestry Division and NMSU Extension publish Firewise guidance. Some counties (e.g. Bernalillo) have adopted a local WUIC.
Texas (statewide) · sourceNo statewide statute foundGuidance onlyNo statewide defensible-space statute found as of Sep. 5, 2026. Texas A&M Forest Service and the State Office of Risk Management publish 0–5 / 5–30 / 30–100 guidance. Municipal WUI codes (Austin) are the enforceable layer.
Idaho (statewide) · sourceNo statewide statute foundGuidance onlyNo statewide defensible-space statute found as of Sep. 5, 2026. Idaho Department of Lands Fire Management Handbook Policy 821, Attachment 2 (revised Jan 2026) is an evaluation form, not an ordinance. Cities (e.g. Boise WUI-O) and counties adopt local overlays.
Montana (statewide) · sourceNo statewide statute foundGuidance onlyNo statewide defensible-space statute found as of Sep. 5, 2026. MCA § 33-24-101 lets insurers discount policies for a 5-ft nonflammable border and for IWUIC compliance; that is an insurance statute, not a clearance duty. DNRC Living With Fire / Home Ignition Zone guides are recommendations. Some counties (e.g. Anaconda-Deer Lodge) write defensible space into zoning and subdivision regulations.

Statewide defensible-space instruments in eleven fire-country states, retrieved September 5, 2026. “No statewide statute found” means we looked and did not find a PRC-4291-style duty on existing homeowners. It is not a finding that the state has no wildfire problem, and it is not a finding that cities in that state have no ordinance.

Oregon’s ORS 476.392 is still on the books in a form that talks about a statewide wildfire hazard map.

Senate Bill 83 (signed July 24, 2025) repealed the map mandate and converted the Fire Marshal’s job to publishing a model code. OAR 837-040-0030, filed April 29, 2026, is the current implementing rule.

We score Oregon as model / local opt-in, not as a statewide existing-home duty.

Six regimes, not one 100-foot rule

HyreYard grouped the eleven states by the legal instrument, not by climate. The groupings are ours. The citations are the states’.

A. Statewide existing-home clearance statute

California. A named duty on the person who owns, leases, controls, operates or maintains the structure. 100 ft, two (soon three) zones, inspections, liens. Zone 0 is in the statute and not yet in the CCR.

B. Statewide new-construction WUI code, including 0–5 ft

Colorado. A minimum code for new buildings and significant additions in the mapped WUI. Existing yards are not retrofitted by the CWRC itself. Locals may go further.

C. Statewide WUI construction code, locally enforced

Utah. The state adopts an IWUIC edition; cities and counties must adopt and enforce it or risk wildfire-suppression cost-share. 2006 code until Jan. 1, 2027, then 2024 IWUIC. Zone 0 is a local add-on today.

D. State model code, local opt-in

Oregon. The 2021 statewide mandate was repealed in 2025. OSFM publishes a 2026 model with a 5-ft noncombustible band. Nothing happens on a given street until the city or county adopts it.

E. Statewide structure hardening; vegetation reserved

Washington. RCW 19.27.560 is a roof-and-wall code triggered by maps that were not final as of the retrieval date. Chapter 6 defensible space is not in the statewide adoption. Locals may add it.

F. No statewide defensible-space statute found

Nevada, Arizona, New Mexico, Texas, Idaho, Montana. Extension programs and fire-marshal publications describe 0–5 / 5–30 / 30–100 zones. The enforceable rule, if any, is a city, county or fire-district ordinance. Several of those ordinances are stricter than anything the state has written.

What may be planted, mulched or fenced against the structure

In the first five feet, the rule changes from thinning brush to changing materials. Where a Zone 0 or Ember Ignition Zone is in force, the pattern holds across section numbers: hardscape or bare mineral soil, no wood mulch, no firewood, no juniper against the siding, and noncombustible fence where the code covers it.

City of Boulder, Colorado: in force on new work. Boulder Revised Code chapter 10-8.5, § 603.2.4, requires a five-foot noncombustible zone around new buildings, decks and additions. Section 603.2.6 bans planting any Juniperus species citywide from August 1, 2025, and requires juniper removal on new-development permits.

Boulder’s Landscape Manual allows squeegee gravel in the noncombustible zone, not aged arbor-chip mulch, and prohibits cedar bark and “gorilla hair” mulch in all WUI ignition-risk areas. New fences and walls within 8 feet must be noncombustible.

City of Austin, Texas: in force on WUI parcels. Austin’s 2024 IWUIC § 603.2.1 applies to applications from July 10, 2025. Within five feet of the roof overhang: gravel or pavers, no plants, no combustible furniture, no artificial turf. Protected and Heritage trees on existing buildings are excepted.

Proximity Zone C may use green, closely mowed lawn instead of hardscape. Ignition-resistant fence is required within 10 feet in Zones A and B and within 5 feet in Zone C.

Town of Truckee / Truckee Fire Protection District, California: in force as an inspection criterion. Truckee Fire defines Zone 0 as 5 feet horizontally and vertically from any structure, with no combustible bark or mulch, and inspects for real-estate transfers, short-term rentals and building-permit finals.

The Town Development Code already bars landscaping, including combustible mulch, within five feet of any building. The district ordinance on its website is still 02-2012, so ask the District which text governs an inspection.

Colorado (statewide): in force on new construction. The 2025 Colorado Wildfire Resiliency Code (8 CCR 1507-39), Structure Ignition Zone 1: noncombustible hard surface, tree crowns at least 10 feet from the structure, ignition-resistant plants only, and noncombustible or ignition-resistant fencing within 8 feet.

The Colorado code does not retrofit existing yards; locals such as Boulder County (IRC § R390.4.12.1) apply a 0–5 foot rule at permit.

Oregon (statewide): in the model code, not in force until a local government adopts it. The 2026 Oregon Defensible Space Model Code § 301.2 is a five-foot noncombustible band that names bark mulch as a prohibited fuel. OAR 837-040-0030 lets a local government adopt it. Until then, OSFM’s homeowner guidance is education.

California (statewide): in the statute, not yet in the CCR. Until OAL publishes the Board package and the PRC § 4291(g) guidance gate is met, the inspectable rules are Zone 1 and Zone 2 in 14 CCR § 1299.03.

Those rules are: dead fuel out of the first 30 feet, firewood covered or moved, 4-inch grass and 3-inch litter in Zone 2.

Local rules are already stricter: Los Angeles County’s named flammable ornamentals, the City of Los Angeles’s 200-foot brush standard and Truckee’s 5-foot mulch ban.

Zone 0 plant, mulch and fence rules, where we could cite them

JurisdictionPlants against the structureMulchFence
California (statewide)Single well-pruned specimens that do not transmit fire are exempt from the 100-ft fuel-modification duty.Not specified as a statewide ban in the current CCR.Not specified as a statewide ban in the current CCR.
Oregon (statewide)OSFM homeowner guidance (not the model code itself): no junipers in the 0–5 ft band; space crowns 10 ft; prune 6 ft from the ground.Model code § 301.OSFM guidance recommends metal gates for fence sections within 5 ft of the house.
Colorado (statewide)Zone 1: ignition-resistant plants only, from the CSFS/CSU list.Zone 1: noncombustible hard surface (rock, gravel, sand, concrete, bare earth, stone/concrete pavers).Class 1 and 2: noncombustible or ignition-resistant material within 8 ft of the structure.
City of Boulder, ColoradoNo species of Juniperus may be planted on or after Aug.Landscape Manual Table 2-1 (WUI): in the noncombustible zone and defensible space, squeegee (≤ ½ in gravel, no fines) is allowed; aged arbor-chip mulch is prohibited in the noncombustible zone; cedar bark / "gorilla hair" organic mulches are prohibited in all WUI areas; living short native grasses are prohibited in the noncombustible zone.New fences and walls within 8 ft of any building or structure: noncombustible materials (§ 503.
Town of Truckee / Truckee Fire Protection District, CaliforniaFire-resistant landscaping may remain in Zone 0 only if maintained so it is not likely to be ignited by embers and spread fire to the structure (draft 2025 ordinance language the District has been using in inspections).No combustible bark or mulch around the structure.District education materials treat the first 5 ft of combustible fence/gate as a home-to-home ignition pathway and a rebate-eligible upgrade.
City of Austin, TexasNew trees should be sited so the mature canopy is outside the EIZ.Combustible mulch is not an EIZ surface.Ignition-resistant fences required within 10 ft of structures in Zones A and B and within 5 ft in Zone C.
City of Los AngelesDoes not apply to healthy fruit trees, privacy hedges or ornamental shrubbery that is free of dead and dry material.Chipped material depth caps as above.10 ft of clearance from combustible fence or roadway used for vehicular travel.

The first five feet, in the jurisdictions that have written a plant, mulch or fence rule we could cite. Rows are excerpts; the full text is in the sources, all retrieved September 5, 2026. California’s statewide row describes the current CCR, not the Board package sitting with OAL.

6 municipal overlays that change the advice

JurisdictionZone 0 / 0–5 ftCitation
Los Angeles County (unincorporated) · sourceStatute yes; CCR noLos Angeles County Fire Code (Title 32) § 325.2.1; § 4907
City of Los Angeles · sourceLocal onlyLAMC § 57.4906.5.2 (Los Angeles Fire Code)
City of Boulder, Colorado · sourceIn force (0–5 ft)Boulder Revised Code ch. 10-8.5 (Wildland Code), adopting the 2024 IWUIC with local amendments including §§ 603.2.4–603.2.6; Landscape Manual Table A-1 and Table 2-1
Boulder County (unincorporated) · sourceIn force (0–5 ft)Boulder County Building Code Amendments, IRC § R390 (effective July 1, 2026); Building Publication B-37
Town of Truckee / Truckee Fire Protection District, California · sourceIn force (0–5 ft)Truckee Fire Protection District Defensible Space Ordinance 02-2012; Town of Truckee Development Code § 18.40 (landscape standards, as amended); TFPD Zone 0 inspection criteria as published 2026
City of Austin, Texas · sourceIn force (0–5 ft)Austin City Code ch. 25-12 art. 8, 2024 International Wildland-Urban Interface Code with local amendments; § 603.2.1 Ember Ignition Zone. Council adopted Apr. 10, 2025 (ord. 20240410-041); applications on or after July 10, 2025.

Municipal and fire-district instruments retrieved September 5, 2026. Not a sample of American cities: these are the overlays we could cite by section, each stricter than or shaped differently from its state row.

City of Los Angeles inspects 200 feet of brush clearance in the VHFHSZ, including onto neighboring lots. Los Angeles County (unincorporated) can push extra-hazard parcels to 200 feet but defaults to 100. That difference inside one metro is why a state row is not enough.

44,100,000 WUI houses is not 44,100,000 covered households

We planned to join the rules table to the SILVIS Lab wildland-urban interface dataset to count covered households. We retrieved the housing numbers, but they measure something else, so we publish them as context only.

Radeloff, Mockrin, Helmers and colleagues mapped the conterminous-US WUI from Census housing and National Land Cover Data for 1990–2020, using the Federal Register definition (66 Fed. Reg. 751). In 2020, 9.4% of CONUS land was WUI, holding more than 44,100,000 homes, 32% of US housing.

WUI housing grew 46% from 1990 to 2020 and WUI area 31%. The 2010s added 2,600,000 WUI houses. California held 5,100,000 in 2020 (244,000 added in the 2010s); Texas held 3,200,000 (534,000 added). Source: Science 382:702–707, 2023; USFS RDS-2015-0012-4.

Why we do not join them. WUI is a geographic class: houses where development meets wildland vegetation. PRC 4291 is a legal class: buildings in the State Responsibility Area.

Gov. Code 51182 is another: occupied dwellings in a locally designated VHFHSZ. Oregon has no statewide map, Washington’s were not final, and Colorado’s code covers new construction.

Texas’s 3,200,000 WUI houses are not houses under a clearance ordinance, because Texas has no statewide one. The accurate sentence: tens of millions of American houses sit where vegetation meets development, and in this table only California puts a statewide landscaping duty on existing homes.

WUI housing, 2020 vintage

44,100,000 CONUS houses in the WUI, 2020 Radeloff et al. 2023, Science
5,100,000 California WUI houses, 2020 Same paper; not a PRC 4291 count
3,200,000 Texas WUI houses, 2020 Same paper; Texas has no statewide clearance statute
2,600,000 WUI houses added, 2010–2020 USFS NRS / SILVIS

These figures describe where houses sit, not which fire code applies. Retrieved September 5, 2026 from https://research.fs.usda.gov/treesearch/67041.

What a homeowner can actually do with this table

Identify the instrument, not the diagram

Ask the local fire authority which text applies to the parcel: PRC 4291, a municipal fire code, a WUI overlay, an HOA rule, an insurer’s guideline, or none of them. The 0–5–30–100 diagram is a teaching aid. It is not a citation.

Treat the first five feet as a materials problem

Where Zone 0 is in force (Austin, Boulder new work, Truckee inspections, Colorado new construction), wood mulch, firewood and an attached wood fence are what the code targets. Swapping bark for gravel is landscaping work, and in those places it is also code work.

Do not wait for California’s CCR to do the 30- and 100-foot work

Zone 1 and Zone 2 in 14 CCR § 1299.03 are in force today in the SRA: dead fuel out of the first 30 feet, 4-inch grass and 3-inch litter to 100 feet, 10 feet from the chimney, firewood covered or moved. Zone 0 is the delayed piece, not the whole statute.

Check the HOA before the plants go in, and after

Utah H.B. 215 (2026) stops a municipality from prohibiting vegetation removal required for IWUIC defensible space. In California, Gov. Code § 51182(f) lets a local agency adopt alternative practices or go stricter. An HOA rule requiring a juniper hedge against the siding would conflict with several codes here. Related: HOA landscaping preemption.

Irrigation is not clearance

A watered lawn in the 5–30 foot band can be a Zone 1 approach. It is not a Zone 0 compliance path in Austin Zones A and B, Boulder’s noncombustible zone or the CWRC. Drought-killed plants are fuel. Watering rules are a separate legal object: see the watering restrictions tracker.

Stop at the power line

Stay away from power lines and call the utility about vegetation near them. Los Angeles County Fire Code § 325.1.1 puts utility-pole clearance on the line owner, not the homeowner. Never climb, fell or cut a tree that could touch a line. Related: tree removal permit rules.

A license is a floor on who may do the work, not a finding that the work is required

Defensible-space work is specified and inspected by the fire authority. A contractor’s license says who may do the work, not whether the work is required. Related: landscaping licensing by state.

Method and limitations

Sources

Primary instruments only: state statutes, administrative codes, enrolled bills, municipal fire and building codes, and the agency page that publishes the current inspection criteria. Extension publications are cited as guidance and labelled as such. Retrieval date on every row: September 5, 2026.

Inclusion

Eleven fire-country states (CA, OR, WA, CO, UT, NV, AZ, NM, TX, ID, MT) plus six municipal overlays we could cite by section. Florida and North Carolina, in HyreYard’s company files, were not part of this pass.

“No statewide statute found” is a search result

It means we did not find a PRC-4291-style duty on existing private yards in that state’s code on the retrieval date. It does not mean no bill was ever introduced, or that no city in the state has an ordinance; the municipal table shows the second can be true.

Zone 0 status is a legal-status field, not a recommendation

In force, adopted but not effective, model opt-in, new construction, guidance, none found. A guidance row is not a rule in force; California’s Zone 0 is the test of that.

No SILVIS household-coverage join

We retrieved Radeloff et al. 2023 and the USFS Research Data Archive WUI product. We assigned no covered-household count to any row, because WUI geography and fire-code geography are different layers.

Board of Forestry Zone 0 text

We describe the Board vote, the OAL file number and the statutory delay gates from instruments we retrieved. We do not reproduce the August 2026 draft as if it were 14 CCR. When OAL publishes, this page should be updated in place.

Snapshots age

A fire code retrieved on a date was current on that date. California Zone 0, Colorado local CWRC adoptions, Utah’s January 1, 2027 IWUIC switch and Washington’s DNR maps are all in motion. Re-read the instrument before relying on a row for a permit or inspection.

Questions

What are defensible space requirements?
They are fire-code rules for the yard around a building. The statewide form, where it exists, is a 100-foot fuel-reduction area, or to the property line, split into inner and outer zones, with a 5-foot ember-resistant band against the building. California PRC § 4291 is the model; no other state in our table applies it statewide to existing homes.
Is California Zone 0 in effect?
Not statewide, as of September 5, 2026. The Board of Forestry voted to adopt Zone 0 regulations on August 19, 2026 and filed them with OAL as 2026-0828-03E, but they were not in the CCR. PRC § 4291(g) then delays new structures until the guidance is updated, and existing homes three more years. Some cities already inspect a 5-foot band.
What is Zone 0 landscaping?
Zone 0 is the 0–5 foot band against the building, including attached decks. Where a code has specified it (Austin, Boulder new work, Truckee inspections, Colorado new construction) the rule is hardscape or bare soil, no wood mulch, no firewood, few or no plants, and in some codes noncombustible fencing.
Can I use bark mulch next to the house?
Not where a 0–5 foot noncombustible zone is in force: Austin, Boulder new work, Truckee inspections and Colorado new construction. California’s current regulations do not yet ban it statewide. Check your local fire authority; the mulch calculator sizes a replacement but cannot say what the code allows.
Do fire codes restrict wood fences?
Some do, near the house. Boulder requires noncombustible fences and walls within 8 feet of new buildings. Austin requires ignition-resistant fence within 10 feet in Zones A and B and 5 feet in Zone C. Colorado’s CWRC uses 8 feet on new work. California’s current regulations do not.
Does living in the WUI mean I have to clear 100 feet?
No. The wildland-urban interface is a geographic class; in 2020 it held 44,100,000 houses in the conterminous US. A clearance duty is a legal class, tied in California to the State Responsibility Area and local high-hazard zones. Texas had 3,200,000 WUI houses and no statewide clearance statute.
Is this legal advice?
No. It is a table of rules we retrieved on September 5, 2026. Fire codes change, local amendments override model text, and a parcel can sit in several overlays. Your local fire authority confirms what applies. HyreYard does not landscape or inspect yards.

Written and audited by

HyreYard Research Desk

Primary-source research, data analysis and fact checking

We are a research desk, not a landscaping company. We read the statute, the municipal code, the water-district rule or the federal soil file ourselves, and we publish the figure with the document it came from and the date we retrieved it.

Where a number cannot be traced to a primary source, we publish the shorter page and say what we could not verify. This desk is new.

The counts below are what we can already stand behind, and every one of them is counted from the studies on this site.

255
source documents cited, each linked
112
government (.gov) domains among them
258
citations carrying a retrieval date
10
research studies published

How this desk works

  • Primary sources only. A rule comes from the statute, ordinance, board or agency that issued it, cited by section, with the URL and the retrieval date. We do not cite a blog that cites a code.
  • Coverage is a number. A table titled to fifty states has fifty sourced rows. A table of cities is titled to the cities we actually read. Gaps are published as gaps.
  • Company counts stay inside seven states. Texas, Arizona, Washington, California, Oregon, Florida and North Carolina. Texas is the largest roster on the weakest evidence, a self-reported NAICS sales-tax permit, because Texas licenses no landscaper. National claims rest on federal or state agency data, never on our counts.
  • Fact, calculation, analysis and recommendation stay labeled. "According to…" is a source. "HyreYard analyzed… and calculated…" is ours. "This suggests…" is interpretation. We do not present our reading as something the source stated.
  • We do not landscape, irrigate, plant, cut trees or pull permits, and we take no payment for placement, ranking or a favorable mention. Nobody buys a position on this site.

Data as of Statutes and ordinances retrieved September 5, 2026. Authorship on this site is organizational: the analysis belongs to the desk rather than to a named individual, and we do not publish credentials we do not hold. Our editorial policy sets out how we source, date and correct what we publish.

The data behind this page

Every figure on this page is computed from one file, and that file is published here so the analysis can be checked, disagreed with, or reused.

Download the dataset (CSV)

Sources & retrieval dates

California Legislature: Public Resources Code § 4291, Statewide SRA defensible-space duty; 100 ft; ember-resistant zone within 5 ft based on Board regulations; (g) and (h) delay gates. Amended by Stats. 2025, ch. 731 (AB 1455), effective Oct. 13, 2025. Retrieved September 5, 2026.
California Legislature: Government Code § 51182, Parallel 100-ft and ember-resistant-zone duty for occupied dwellings in locally designated VHFHSZ. Amended by Stats. 2025, ch. 731. Retrieved September 5, 2026.
14 CCR § 1299.03, as reproduced in the 2025 California Wildland-Urban Interface Code App. H, Current inspectable zones: Zone 1 (0–30 ft) and Zone 2 (30–100 ft). Zone 0 is not in this section. Retrieved September 5, 2026.
California Board of Forestry and Fire Protection: Notice of Proposed Emergency Action, Zone 0 Defensible Space, Board adoption Aug. 19, 2026; planned OAL submittal on or after Aug. 28, 2026; file 2026-0828-03E. Not treated here as an in-force CCR section. Retrieved September 5, 2026.
Oregon Secretary of State: OAR 837-040-0030, Adopts the 2026 Oregon Defensible Space Model Code (IWUIC 2024 §§ 603–604 as amended). Local governments may elect to adopt. OSFM 2-2026, filed Apr. 29, 2026, effective Apr. 29, 2026. Retrieved September 5, 2026.
Oregon State Fire Marshal: Defensible Space, Model-code landing page, homeowner zone explorer, and local-adoption notice. Education program, not a statewide inspection mandate. Retrieved September 5, 2026.
Oregon Legislature: ORS 476.392, Minimum defensible-space requirements; read against SB 83 (2025), which repealed the statewide map mandate. Retrieved September 5, 2026.
Washington Legislature: RCW 19.27.560, Statewide WUI adoption is selected ignition-resistant construction (roof, walls, appendages) plus driveways, triggered by DNR maps. Locals may adopt the IWUIC in whole. Vegetation management is not in the statewide list. Retrieved September 5, 2026.
Washington Administrative Code: Chapter 51-55, State Building Code adoption of the 2021 IWUIC; vegetation-management sections reserved. Last update noted Mar. 17, 2026. Retrieved September 5, 2026.
Colorado Division of Fire Prevention and Control: Wildfire Resiliency Code Board, SB 23-166 board; 2025 CWRC established July 1, 2025 through 8 CCR 1507-39; local compliance reports due July 31, 2026. Retrieved September 5, 2026.
Colorado DFPC: CWRC testing requirements and Structure Ignition Zones, Class 1 / Class 2 hardening; Zone 1 (0–5 ft) noncombustible hard surface and ignition-resistant plants; fencing within 8 ft. Retrieved September 5, 2026.
Utah Legislature: H.B. 41 (2026), enrolled, Adopts the 2024 IWUIC in § 15A-2-103, effective Jan. 1, 2027; deletes IWUIC § 602; postpones high-risk WUI fee. Retrieved September 5, 2026.
Nevada SFM Wildland-Urban Interface Code 2018, Chapter 6, IWUIC Table 603.2 fuel-modification distances as published by the State Fire Marshal. Locally adopted; not scored here as a PRC-4291-style statewide homeowner statute. Retrieved September 5, 2026.
University of Nevada Cooperative Extension: Living With Fire Defensible Space Guide, Zone 0 / 1 / 2 guidance for Nevada ecosystems, including cheatgrass. Guidance, not an ordinance. Retrieved September 5, 2026.
University of Arizona Cooperative Extension: Firewise Landscapes, Immediate / Intermediate / Extended zone guidance. Not a statewide statute. Retrieved September 5, 2026.
New Mexico Office of Superintendent of Insurance: Wildfire Hardening & Defensible Space Checklist, Updated January 28, 2026. Insurance/preparedness checklist, not a clearance statute. Retrieved September 5, 2026.
New Mexico Legislature: 2025 SB 33 (final), Task force to develop building-code and defensible-space standards, including a noncombustible five-foot zone. Study mandate, not an adopted clearance rule. Retrieved September 5, 2026.
Texas State Office of Risk Management: Wildfire Preparedness, 0–5 / 5–30 / 30–100 guidance, April 13, 2026. Not a statute. Retrieved September 5, 2026.
Idaho Department of Lands: Fire Management Handbook Policy 821, Attachment 2, Home-protection-zone evaluation form, revised January 2026. 4-ft non-flammable break as an evaluation criterion, not a statute. Retrieved September 5, 2026.
Montana Code Annotated § 33-24-101, Insurer discounts for fire-preventative measures, including a 5-ft nonflammable landscaping border. Insurance statute, not a clearance duty. Retrieved September 5, 2026.
Los Angeles County Fire Code § 325.2.1 and Chapter 49, 100-ft defensible space; extra-hazard up to 200 ft; ember-resistant zone language tracking the state statute. Retrieved September 5, 2026.
Los Angeles Fire Department: Brush Clearance Requirements, LAMC § 57.4906.5.2: 200 ft in the VHFHSZ, including adjoining lots; 3-in grass; 5-ft roof clearance; chip-depth caps. Retrieved September 5, 2026.
City of Boulder: Landscape Manual (WUI mulch table and Wildland Code summary), Noncombustible 0–5 ft zone; juniper planting ban from Aug. 1, 2025; 8-ft noncombustible fence; squeegee vs arbor-chip vs bark. Retrieved September 5, 2026.
Boulder County: Building Publication B-37 / IRC § R390, 5-ft weed-barrier and ¾-in gravel perimeter; CSFS defensible-space standard or Wildfire Partners certificate. Retrieved September 5, 2026.
Truckee Fire Protection District: Defensible Space, Published Zone 0 / 1 / 2 inspection criteria; required inspections for real estate, short-term rentals and permit finals; Ordinance 02-2012 still posted as the numbered ordinance. Retrieved September 5, 2026.
City of Austin: 2024 IWUIC Chapter 6, § 603.2.1 Ember Ignition Zone, 5-ft noncombustible EIZ; Zone C lawn exception; Protected/Heritage tree exception; ignition-resistant fence distances. Applications on or after July 10, 2025. Retrieved September 5, 2026.
Radeloff, V.C. et al. 2023: Rising wildfire risk to houses in the United States, especially in grasslands and shrublands, Science 382:702–707. CONUS WUI housing 44,100,000 (2020); California 5,100,000; Texas 3,200,000. Used as geographic context only. Retrieved September 5, 2026.
USFS Research Data Archive: The 1990–2020 wildland-urban interface of the conterminous United States, RDS-2015-0012-4. SILVIS Lab, UW-Madison, with USFS Northern Research Station. Retrieved September 5, 2026.
USFS Northern Research Station: Wildland-Urban Interface Growth in the U.S., Project page restating the 2020 WUI housing and area figures. Retrieved September 5, 2026.

Put the clearance rule in the written scope

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