Soil Texture: Sand, Silt, Clay and How to Test It

Quick answer

Soil texture is the weight share of sand, silt and clay particles in the part of a soil finer than 2 millimeters, and USDA sorts every mix into one of twelve texture classes, such as sandy loam, loam or clay.

Texture is set by the minerals in the ground, so it changes little over time. It strongly shapes how fast water drains, how much water and nutrients a soil holds and how easily it compacts.

Quick facts

The key facts about Soil Texture, with sources:

Size limits (USDA): Sand 2.0 to 0.05 mm; silt 0.05 to 0.002 mm; clay 0.002 mm or less (finer than 2 mm overall) ¹
Number of classes: Twelve, from sand to clay, placed on the USDA texture triangle ¹
What it measures: Weight proportion of the separates, from a lab particle-size test ¹
Feel in the hand: Sand gritty, silt smooth or floury, clay sticky ¹²
Can you change it?: Not easily. WSU calls texture a fixed property that management cannot change ⁵
Field tests: Ribbon test and jar test give estimates, not lab values ¹²³
Parcel lookup: USDA Web Soil Survey maps mapped soils for most U.S. counties ¹⁰

Key takeaways

Texture is about particle size, not about how dark or rich the soil looks. Sand is the largest particle, silt is in the middle and clay is the smallest.
USDA names twelve classes. Loam, a balanced mix, is the one most gardeners want.
You can estimate texture at home with the ribbon test or a jar test. Both are estimates, and a lab test is the check.
You cannot change the texture of a whole yard in practice. You can change how you manage it, and you can add organic matter.
Adding sand to clay soil does not make loam. Two extension sources say it can make the soil worse.

Texture is the size mix of the mineral grains

Every mineral soil is a blend of three kinds of particles. The USDA Soil Survey Manual defines soil texture as the weight proportion of the separates for particles less than 2 millimeters, as found by a laboratory particle-size test ¹. Sand, silt and clay are the three groups.

USDA draws the lines at these sizes. Sand runs from 2.0 down to 0.05 mm, silt from 0.05 to 0.002 mm, and clay is 0.002 mm and smaller ¹. Colorado State Extension prints the same breaks and adds that sand is gritty, silt is smooth or floury, and clay is sticky ².

Not every publisher uses the USDA scale. Oregon State’s soil guide, for example, lists silt as 0.002 to 0.02 mm and fine sand from 0.02 to 0.2 mm ⁶. The Soil Survey Manual itself compares the USDA system with four others ¹. When you compare two reports, check which scale each one used.

Texture should not be mixed up with structure. Texture is the size of the grains. Structure is how those grains clump into aggregates. Our soil structure page covers clumping, and the soil compaction page covers what happens when the pores squeeze shut.

How a jar test works, step by step

Clemson Extension’s factsheet HGIC 1656 describes this test. It gives an estimate, because the result depends on careful measuring and timing ³.

Sift the sample. Pass the soil through a mesh sieve or old colander to remove debris, rocks and large organic matter ³.
Fill a straight-edged jar one-third full of soil, then add clean water, leaving some room at the top ³.
Shake until it is a uniform slurry. Set the jar on a level surface ³.
Wait one minute and mark the sand. The coarse sand layer settles first ³.
Wait two hours and mark the silt layer ³.
Wait 48 hours and mark the clay layer, which settles on top of the silt ³.
Measure each layer and the total height, then divide each layer by the total and multiply by 100 to get percent sand, silt and clay ³.
Plot the three numbers on the USDA triangle to find the class ³¹.

Process The jar test timeline

Sift and fillOne-third soil, then water
Shake to slurryLevel surface
1 minuteMark the sand layer
2 hoursMark the silt layer
48 hoursMark clay, measure, calculate

Times are from Clemson Extension HGIC 1656. Other extension offices print different times and a dispersing agent, so follow one protocol throughout. Source: [3]

Sand, silt and clay compared

Size limits are the USDA separates [ssm]. Behavior notes are from University of Maryland Extension and WSU Extension.
Particle	Size (USDA)	How it feels	Water and nutrients
Sand	2.0 to 0.05 mm; can be seen one grain at a time ¹	Gritty ¹	Drains quickly after a storm; nutrients can move below the root zone, so plants may need more frequent watering and feeding ⁴
Silt	0.05 to 0.002 mm; cannot be seen without magnification ¹	Smooth, floury ¹²	Medium-textured soils such as silt loams have moderate water and nutrient holding and moderate drainage ⁴
Clay	0.002 mm and smaller ¹	Sticky in some areas ¹	Drains slowly because tiny particles pack tightly; high water and nutrient holding; more susceptible to compaction ⁴
Loam	A balanced mix of all three	Crumbly, in between	WSU says a soil with roughly equal influence from sand, silt and clay is called a loam ⁵

Side by side Three particle sizes, three behaviors

Sand

Largest grains, gritty
Large pores, fast drainage
Nutrients can leach below roots

Silt

Smooth or floury
Moderate drainage and holding
Cannot be seen without magnification

Clay

Smallest, sticky
Slow drainage, high holding
Compacts more easily

Source: [1] [4] [5]

Texture sets pore size, and pore size sets drainage

WSU says pores between sand particles tend to be large, while pores between silt and clay particles tend to be small ⁵.

Wisconsin soil scientist Birl Lowery adds that a soil with lots of pore space can still drain poorly if the pores are small and poorly connected ¹¹. See soil drainage and infiltration for rates.

Example: reading three jar tests against USDA class definitions

The three jars are invented. The class rules are taken from the USDA Soil Survey Manual definitions ¹. Percentages are layer height divided by total height, the method Clemson prints ³.

Jar (example)	Layer heights (mm)	Percent sand / silt / clay	USDA class by the Manual’s rules
A: sandy bed by the fence	Total 60; sand 39, silt 12, clay 9	65 / 20 / 15	Sandy loam: clay 7 to less than 20 and more than 52 percent sand, with silt plus twice clay at 30 or more (here 50) ¹
B: vegetable bed	Total 60; sand 24, silt 24, clay 12	40 / 40 / 20	Loam: 7 to less than 27 percent clay, 28 to less than 50 percent silt and 52 percent or less sand ¹
C: new-build backyard	Total 60; sand 12, silt 18, clay 30	20 / 30 / 50	Clay: 40 percent or more clay, 45 percent or less sand and less than 40 percent silt ¹

A jar gives estimates. If the answer matters, as it does when buying topsoil or planning a drain, send a sample for a lab particle-size test. See soil testing for lawns and gardens.

Where soil texture shows up

In a soil test report. Some reports list a texture class or percent sand, silt and clay. Check whether yours does before you assume it.

On a topsoil or fill order. Utah State Extension’s topsoil guidelines list loam and silt loam as ideal texture classes, with sand, silt and clay each under 70 percent and clay under 30 percent ⁷. See compost vs. topsoil.

In a drainage plan. The NRCS sorts mapped soils into hydrologic soil groups partly by texture, so a sandy soil and a clay soil land in different groups ⁹. See our soil drainage research.

On a plant tag. Tags that say well-drained or loamy soil are making a texture claim. A tag cannot tell you what your own soil is.

On a landscaping bid. A bid for grading, bed prep or a drain often assumes a soil type. Read how to compare estimates and ask what texture the crew found.

What knowing your texture lets you do, and what it cannot tell you

What it can tell you

How fast water is likely to drain and how much it can hold ⁴.
Whether the soil is likely to compact. UMD says soils with a lot of clay are more susceptible to compaction ⁴.
Which plants and amendments to ask about. UNH says high-sand soils will not hold water or nutrients well and high-clay soils will not drain well ⁸.
A starting point for the NRCS hydrologic soil group, which uses texture along with other traits ⁹.

What it cannot tell you

How the soil clumps. That is structure, not texture ¹¹.
Whether it is packed. Compaction can squeeze pores in any texture.
The pH, nutrients or organic matter. These need a soil test.
Exactly what is under the surface. Texture can change with depth, so one jar is a sample of one place.

Limits of home tests and of the triangle

The Soil Survey Manual says field estimates of texture are qualitative, and that an estimated class should be checked against laboratory determinations ¹. Some soils, such as those high in gypsum, do not disperse fully in a lab test, which makes feel and lab results differ ¹.

The jar test depends on timing and shaking. Extension offices print different protocols, some with a dispersing agent such as detergent, and different settle times. The same soil can come out a little differently in each. Pick one method and keep to it when you compare results.

The ribbon test is a feel test. Colorado State adds that as little as about 20 percent clay can make a soil behave like clay, and that a soil needs roughly 45 to over 60 percent medium-to-coarse sand to behave as sandy ². A numbers-only reading can mislead.

Texture varies by place and depth in a yard. A single sample from the back corner does not describe a front lawn that was regraded during construction. Take samples from several spots.

Chart Percent thresholds printed by Utah State and Colorado State

Colorado State says about 20 percent clay can make a soil behave as clayey and 45 to over 60 percent sand is needed to behave as sandy, while Utah State treats topsoil above 30 percent clay or above 70 percent sand or silt as unacceptable.

Percent thresholds printed by Utah State and Colorado State (percent)
Item	Value (percent)
Clay at which a soil can act clayey (CSU)As little as about 20 percent clay ²	20 %
Medium-to-coarse sand needed to act sandy, low end (CSU)Roughly 45 to over 60 percent ²	45 %
Clay above which topsoil is unacceptable (USU)Unacceptable above 30 percent clay ⁷	30 %
Sand above which topsoil is unacceptable (USU)Unacceptable above 70 percent sand ⁷	70 %
Silt above which topsoil is unacceptable (USU)Unacceptable above 70 percent silt ⁷	70 %

Data period: Colorado State GardenNotes #214 (reviewed Sept. 2022), Utah State Extension Topsoil Quality Guidelines (Dec. 2010), read 2026-10-14

Source: [2] [7]

What drives the cost of finding out, and what texture means for the job

We publish no prices. A jar test costs the price of a jar and some time. A lab particle-size test is the paid step. Lab fees and what a report includes vary by lab, so ask for the method.

Texture itself drives the price of other work. Clay slows digging and drainage. Very sandy soil may need more irrigation. A bid that assumes one soil and finds another can change. See the cost hub for what moves a landscaping bid.

Texture does not wear out. It stays about the same for as long as you own the land, unless soil is stripped, buried or imported. Only management changes, so there is no lifespan to give.

How to estimate texture by feel, and who can help

Colorado State’s ribbon test is quick and needs only your hands and water. It is an estimate, and a soil lab or extension office can confirm it ².

Take a handful of soil from several spots in moist, not wet, soil.
Squeeze it into a ball. Coarse soils such as sand and loamy sand break with slight pressure; fine soils such as clay resist breaking ².
Form a moist ribbon between thumb and forefinger and let it extend over the forefinger until it breaks ².
Read the ribbon. Under 1 inch and gritty points to a coarse, sandy soil. 1 to 2 inches suggests a medium soil. Over 2 inches suggests a fine, clayey soil ².
Use the CSU key: no ball forms means sand; a ball with no ribbon means loamy sand; a ribbon under 1 inch is the loam family; 1 to 2 inches is the clay loam family; 2 inches or longer is the clay family ².
Call 811 before you dig any hole or trench to compare layers ¹⁴.

Call 811 before digging below the surface layer

USA North 811 says to call at least two working days before you dig, that locating is free, and not to dig until each utility has responded ¹⁴. Dig only as deep as you need to take a sample.

Working with the texture you have

The are habits, not dates. Climate and plants change the details.

Sandy soil. Organic matter helps it hold water and nutrients, per WSU ⁵. See soil organic matter.
Clay soil. Keep traffic off when wet. UMD says clay soils are more susceptible to compaction from foot traffic, vehicles and machinery ⁴.
Do not till wet soil. WSU’s test: if a handful can be molded into a worm shape, it is too wet to till ⁵.
Add organic matter, not sand. OSU and Mississippi State both warn against adding sand to clay ¹²¹³.
Re-test after big changes. Grading, import fill or construction can change what lies on top.

Signs your texture is working against you

Water drains almost instantly and plants wilt fast. This points to a very sandy soil, which UMD says drains quickly after a thunderstorm ⁴.
Water sits on the surface or soil bakes hard. Clay drains slowly because its tiny particles pack closely ⁴.
Soil that sticks to a shovel in a ball. Clay soils are sticky ¹.
Uneven growth across the yard. Texture can differ from spot to spot. Test the bad area and a good area.
Standing water after storms. The cause may be texture, a perched layer or grade. See yard ponding and the drainage diagnostic.

If a slab, patio or wall is planned over clay, read our expansive soils research below and talk to an engineer.

Standards that define texture and what is a rule

A classification, not a law. The USDA Soil Survey Manual defines the separates and the twelve texture classes, and the NRCS maintains soil maps ¹¹⁰. Using them is not required of a homeowner.

Soil maps. NRCS Web Soil Survey says it gives soil maps and data for more than 95 percent of U.S. counties. It says surveys suit general local planning and that onsite investigation is needed in some cases ¹⁰.

Topsoil specs. Utah State’s topsoil guidelines are a university recommendation, not a statute. UNH notes that New Hampshire has no legal definition of topsoil and no rules governing its sale ⁸. Other states may differ.

Engineering. Soil classification for foundations and walls is done by an engineer, not from a jar test.

Utility locates. State 811 rules apply before you dig for any sample ¹⁴.

Texture compared with other soil terms

Term	What it describes	How you check it	Can you change it?
Soil texture	Size mix of sand, silt and clay	Jar or ribbon test, lab test ²³	Not practically ⁵
Soil structure	How grains clump into aggregates	Look at crumbs and pores	Yes, over time, by management ⁵
Soil compaction	Pores squeezed shut	Probe or bulk density	Yes, with effort
Soil organic matter	Decayed plant and animal material	Lab test	Yes, slowly
Soil amendments	Materials added to change soil	Test before and after	They change structure and nutrients, not texture

Common beliefs about soil texture

Myth Dark soil is good soil.: Reality Color says little about texture. Texture comes from the weight share of sand, silt and clay, found by a lab test ¹.
Myth Mix sand into clay to make loam.: Reality OSU says adding sand to clay soil can create a concrete-like mix, and Mississippi State says never to add sand to high-clay soil ¹²¹³.
Myth You can change your soil’s texture with a few bags.: Reality WSU says texture is a fixed property that management cannot change, and Utah State says changing texture on a large scale is impractical ⁵⁷.
Myth A jar test gives exact percentages.: Reality It gives estimates that depend on careful measuring and timing, per Clemson ³.
Myth Loam is just a nice word for topsoil.: Reality Loam is a texture class for a balanced mix. Topsoil is a layer or a product ⁵⁸.

The regional variable: the soils your county mapped

The best local fact is the soil map unit under your lot.

NRCS Web Soil Survey publishes soil maps and descriptions for most counties, and its own notes say onsite checks are sometimes needed ¹⁰.

Expansive clays, sandy coastal soils and rocky fill all sit in different regions. See our expansive-soils research if clay is common near you.

When texture matters most, and your next step

Texture matters most when you are choosing topsoil, planning a drain, picking plants for a wet or dry bed, or deciding if a spot will compact. If none of those apply, the ribbon test is enough to satisfy curiosity.

Your next step is to do the ribbon test in two or three places, then a jar test if the answer drives a spending decision. Look up your parcel in Web Soil Survey for a map-based second view ¹⁰.

If the result will guide a purchase or a build, send a sample to a lab and read soil amendments before adding anything. Compare any contractor’s assumptions to what you found.

Questions about Soil Texture

What is soil texture?

Soil texture is the weight share of sand, silt and clay in the part of a soil finer than 2 millimeters. USDA sorts every mix into one of twelve texture classes. It is set by the mineral grains in the ground, so it changes little over time, unlike structure or organic matter.

What are the sizes of sand, silt and clay?

In the USDA system, sand is 2.0 to 0.05 millimeters, silt is 0.05 to 0.002 millimeters and clay is 0.002 millimeters or smaller. Sand is gritty and visible, silt feels smooth or floury, and clay is sticky. Other publishers use different silt and sand limits, so check the scale.

What is loam soil?

Loam is a balanced mix of sand, silt and clay. WSU Extension says a soil with roughly equal influence from sand, silt and clay is called a loam. In USDA rules, loam has 7 to under 27 percent clay, 28 to under 50 percent silt and 52 percent or less sand.

How do I test my soil texture at home?

Use the ribbon test or the jar test. For the ribbon test, squeeze moist soil and push a ribbon between thumb and finger; a longer ribbon points to more clay. For a jar test, shake soil in water and measure the layers after one minute, two hours and 48 hours. Both give estimates.

How long does a soil jar test take?

Clemson Extension’s version takes about 48 hours. You mark the sand after one minute, the silt after two hours and the clay after 48 hours. Other extension offices print different times and may add a dispersing agent, so follow one protocol and stay with it.

Can I change my soil from clay to loam?

Not in practice for a whole yard. WSU Extension calls texture a fixed property that management cannot change, and Utah State says large-scale texture change is impractical. You can add organic matter and manage traffic and moisture. Do not add sand to clay; OSU and Mississippi State warn against it.

Does sandy soil drain better than clay?

Yes, usually. UMD Extension says soils high in sand drain quickly after a storm and may need more frequent watering and fertilizing, while clay drains slowly and holds more water and nutrients. Better drainage is not always better for plants; it depends on the plant.

What is the soil texture triangle?

It is a chart that turns three percentages, sand, silt and clay, into one of twelve USDA texture class names. You find your clay percent on one side, silt on another, sand on the third, and read the class where the lines meet. It needs measured percentages to be accurate.

How does soil texture affect drainage?

Texture sets pore size. Sand pores are large and drain fast; silt and clay pores are small and drain slowly. Wisconsin soil scientist Birl Lowery notes that clay can hold lots of pore space in tiny pores that do not connect well, so water and air move slowly.

Where can I find out the soil type on my lot?

Use USDA NRCS Web Soil Survey, which gives soil maps and descriptions for more than 95 percent of U.S. counties. It says surveys are meant for general planning and that onsite investigation is sometimes needed. A lab test or a local extension office can confirm your own yard.

Sources

USDA NRCS, Soil Survey Manual, Chapter 3: Examination and Description of Soils (PDF text extracted locally), retrieved October 14, 2026.
Colorado State University Extension, Estimating Soil Texture: Sandy, Loamy, or Clayey (GardenNotes #214, rev. Sept. 2022), retrieved October 14, 2026.
Clemson Cooperative Extension HGIC, Soil Texture Analysis: The Jar Test (HGIC 1656, rev. Dec. 2023), retrieved October 14, 2026.
University of Maryland Extension, Soil Basics, retrieved October 14, 2026.
Washington State University Extension, A Home Gardener’s Guide to Soils and Fertilizers (EM063E, rev. Jan. 2020), retrieved October 14, 2026.
Oregon State University Extension, Soil: The dirty secrets of a living landscape (EM 9304, Dec. 2020), retrieved October 14, 2026.
Utah State University Extension, Topsoil Quality Guidelines for Landscaping (R. Koenig and V. Isaman, Dec. 2010), retrieved October 14, 2026.
UNH Cooperative Extension, Purchasing Topsoil (updated Aug. 2016; PDF text extracted locally), retrieved October 14, 2026.
USDA NRCS, National Engineering Handbook Part 630, Chapter 7: Hydrologic Soil Groups (210-VI-NEH, Jan. 2009; mirror hosted by the ASDSO Dam Safety Toolbox, PDF text extracted locally), retrieved October 14, 2026.
USDA NRCS, Web Soil Survey, retrieved October 14, 2026.
B. Lowery, University of Wisconsin-Madison, Soil Structure: Friend or Foe? (Proc. 2006 Wisconsin Fertilizer, Aglime and Pest Management Conference; PDF text extracted locally), retrieved October 14, 2026.
Oregon State University Extension, Improving garden soils with organic matter (EC 1561, rev. 2026), retrieved October 14, 2026.
Mississippi State University Extension, Soil Compaction in Mississippi Landscapes (P3748), retrieved October 14, 2026.
USA North 811, DIYers (call 811 before you dig), retrieved October 14, 2026.

Expert review

Written by the HyreYard Research Desk. Not yet reviewed by an outside expert. We say so rather than imply a review that has not happened; see our editorial policy.

How the numbers were checked: Particle-size limits, the twelve classes and the class rules used in the example come from the USDA Soil Survey Manual chapter 3, read as extracted PDF text.

Jar test steps are Clemson’s; ribbon test steps are Colorado State’s; behavior notes are University of Maryland and WSU. The hydrologic-group source is a mirror of NRCS’s handbook chapter hosted by the Dam Safety Toolbox. We did not load the NRCS texture calculator page (timeout).

Suggest a correction. We fix errors and say what changed.