Best Cover Crops for Erosion Control: 8 Compared

The best cover crops for erosion control are fast, dense grasses such as cereal rye, oats, annual ryegrass, barley and wheat, often mixed with a legume such as crimson clover or hairy vetch. A SARE review of field studies found that grass-type covers cut soil loss by 31% to 100% compared with no cover, and legumes by 38% to 69%. The right pick depends on your planting date, your winters and whether you want nitrogen as well as soil cover.

This guide compares eight common choices on how fast they cover the ground, how hardy they are, seed rate and seed cost. It also shows what the cost looks like on your own farm, with a calculator further down.

How cover crops stop soil erosion

Rain and wind move soil when the ground is bare. A cover crop protects the surface in four ways.

• Leaf cover: leaves and stems take the hit from raindrops, so soil crumbs do not break apart and seal the surface.
• Slower runoff: stems and residue slow water moving across the field, so more of it soaks in.
• Roots: fine, fibrous roots hold soil aggregates together and keep them in place.
• Wind break: standing plants cut wind speed at the soil surface, which matters on light soils in the Great Plains, the Canadian Prairies and parts of Australia.

The size of the effect depends on how much soil is already protected. In the same SARE summary, cover crops reduced sediment loss by an average of 20.8 tons per acre on conventional-till fields, 6.5 tons on reduced-till fields and 1.2 tons on no-till fields. Put simply, the more tillage you do, the more a cover crop saves. The SARE bulletin on covering the soil to prevent erosion says the best practices keep the ground covered all year, for example no-till combined with cover crops.

Local results show the same pattern. In Minnesota studies of winter rye in corn-soybean fields, published by the Minnesota Department of Agriculture, rye plots under simulated rain lost less sediment than bare fallow plots, and nitrate losses in spring runoff fell by 98%. In a Missouri on-farm project funded by SARE, a model estimate put erosion on a typical upland field at 2.6 tons per acre per year, falling to 0.8 tons per acre when cereal rye was added after soybeans. That second figure is a model, not a field measurement.

Chart

Sediment saved by cover crops, by tillage

Average reduction in sediment loss, tons per acre

Best cover crops for erosion control, compared

We grouped the options by what they do best. Seed rates come from the SARE Managing Cover Crops Profitably planting chart and the Mississippi State Extension seeding guide. Always check your own state or provincial guide, because rates change with region and seeding method.

1. Cereal rye

Best for: late fall planting after corn or soybeans in cold regions.

Cereal rye is the standard choice when you plant late. It germinates in cool soil, survives hard winters and grows again early in spring. Its dense, fibrous roots hold topsoil well. SARE lists a drilled rate of 60 to 120 lb per acre; Mississippi State suggests 60 to 90 lb alone or 25 to 40 lb in a blend.

Watch out for: heavy spring growth can tie up nitrogen and make planting harder. Terminate on time before corn.

2. Oats

Best for: early fall cover that dies over winter, ahead of an early spring crop.

Oats grow fast in late summer and early fall. In cold zones they winter-kill and leave a soft mulch, so you do not need to terminate them in spring. SARE lists 80 to 110 lb per acre drilled.

Watch out for: once the plants die, ground cover thins by spring, so they protect less on steep ground than rye does.

3. Annual ryegrass

Best for: fine root mass on sloping fields and around waterways in mild climates.

Annual ryegrass has a very fine, dense root system and small seed, so the seed cost per acre is low. SARE lists 10 to 20 lb per acre drilled.

Watch out for: it can be hard to kill, and some populations resist common herbicides. Plan the termination before you plant.

4. Winter wheat and barley

Best for: growers who already have the seed and drill on hand.

Wheat and barley cover the soil well, are easy to manage and cost little per acre. Barley is less winter-hardy than wheat or rye. SARE lists 60 to 120 lb per acre drilled for wheat and 50 to 100 lb for barley.

Watch out for: wheat can host some of the same pests and diseases as a following wheat crop.

5. Crimson clover

Best for: soil cover plus nitrogen in areas with mild winters.

Crimson clover grows fast in spring, fixes nitrogen and flowers early, which supports pollinators. Mississippi State lists 20 to 30 lb of pure live seed per acre alone, or 12 to 16 lb in a blend.

Watch out for: it is less winter-hardy than hairy vetch and needs the right rhizobium inoculant.

6. Hairy vetch

Best for: nitrogen ahead of corn, mixed with cereal rye for ground cover.

Hairy vetch is one of the more winter-hardy legumes. It grows slowly in fall, so on its own it protects soil less than a grass does. Mixed with rye it gives both cover and nitrogen. SARE lists 15 to 20 lb per acre drilled.

Watch out for: hard seed can come back as a weed in later crops, and the seed costs more than most cereals.

7. Forage radish and other brassicas

Best for: breaking up compacted layers so water soaks in.

Radish grows a thick taproot that opens channels in the soil. Mustard, another brassica, reduced soil loss by up to 82% in the studies SARE summarized. SARE lists 8 to 13 lb per acre drilled for radish.

Watch out for: radish winter-kills and breaks down quickly, so pair it with a grass if you need cover through spring.

8. Perennial covers: white clover, perennial ryegrass, alfalfa

Best for: orchard and vineyard rows, field edges, grassed waterways and slopes that need cover for several years.

Perennials give year-round protection and do not need replanting each season. White clover and perennial ryegrass are common between tree and vine rows; alfalfa has deep roots and fixes nitrogen.

Watch out for: perennials can compete with the main crop for water. In dry regions, mow or manage them closely.

Comparison table

Rates are drilled rates from the SARE planting chart. SARE lists higher rates for broadcast seeding. Winter hardiness is a general guide; it depends on the variety and on snow cover.

How we chose these cover crops

We did not run our own field trials. We picked the eight species that appear in the main US extension seeding guides and in the SARE soil-loss summary, then compared them on four points a grower can check: speed of ground cover, winter survival, drilled seed rate and seed cost per acre. Erosion figures come from the studies named in each section. We did not rank one crop as best overall, because the right answer changes with planting date and climate.

Grasses vs legumes for erosion control

Grasses build ground cover faster in fall and keep more residue on the surface. Legumes add nitrogen but grow more slowly before winter. That difference shows in the soil-loss data: in the SARE summary, the range for grass-type covers reaches higher than the range for legumes.

Chart

Soil loss cut by cover crop type

Range of reductions vs no cover crop, % (studies summarized by SARE)

A common answer is a mix. Cereal rye with hairy vetch or crimson clover gives fall cover from the grass and spring nitrogen from the legume. USDA data show that mixes make up a real share of cover crop acres: the USDA Economic Research Service points to an earlier chart in which mixes accounted for 18% to 25% of major commodity acreage with cover crops.

In the Southeast, Arkansas research found that lower seeding rates gave similar biomass to full rates for most winter legumes tested, though crimson clover did better at the higher rate, which can trim seed costs. Treat this as one study, not a rule for every region.

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What cover crops cost per acre

Seed is usually the largest single cost. In the SARE planting chart, the median seed cost per acre for drilled seeding ranged from about $12 for annual ryegrass to $35 for hairy vetch. These are 2006 seed prices from the chart, not today’s dealer quotes, so current costs are likely higher; check prices with your supplier.

Chart

Median seed cost per acre, drilled

US$ per acre at 2006 seed prices, SARE planting chart

Planting and termination add to the bill. If you plant with your own drill, count fuel, labor and wear. If you terminate with a herbicide, follow the product label and local rules; if you roll or mow, count the extra pass.

Cost-share can offset part of the cost. In Pennsylvania’s published NRCS cost list for fiscal year 2026, the EQIP payment for practice 340 (Cover Crop) was $76.94 per acre for a single species and $80.15 per acre for a multi-species mix, with higher rates for historically underserved producers. Pennsylvania set an EQIP practice cap of $40,000 for cover crops (there is no such cap under CSP). Rates differ by state and change each year, so check with your local NRCS office. Outside the US, ask your regional agriculture department or conservation authority about similar schemes.

Enter your own numbers below to see your cost after any payment.

Try the numbers for your own farm below.

How to plant cover crops for erosion control

1. Pick the goal. If erosion is the main problem, start with a grass or a grass-legume mix.
2. Check the window. Count the days between cash crop harvest and your first hard frost. Short window: cereal rye. Longer window: oats, radish or a mix.
3. Use good seed. Buy tested seed and inoculate legumes with the right rhizobium.
4. Get the depth right. Small seeds such as clover go about 1/4 to 1/2 inch deep; rye can go 3/4 to 2 inches, as Mississippi State lists.
5. Drill when you can. Drilling uses less seed and gives a more even stand than broadcasting.
6. Plan termination. Decide when and how you will end the cover before you plant. Check crop insurance and cost-share rules for timing.
7. Check the stand. Walk the field or check satellite maps to find thin or bare patches, especially on slopes and in low areas.

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Common mistakes

• Planting too late for the species, so the field stays bare all winter.
• Choosing a winter-killed crop for a steep field that needs spring cover.
• Letting cereal rye grow too tall before corn, which can tie up nitrogen.
• Skipping inoculant on legumes.
• Giving up after one year. Soil structure and organic matter build over several seasons.

How many farms use cover crops

US cover crop area grew 17% between the last two censuses, from 15,390,674 acres in 2017 to 17,985,831 acres in 2022, according to the USDA Economic Research Service. That was 4.7% of total cropland in 2022. Texas had the largest increase.

Growth is uneven. A study in Choices magazine found that 1,279 counties, 45.6% of counties in the lower 48 states, lost cover crop area between 2017 and 2022, a combined 2.3 million acres. Without that loss, cover crops would have reached 5.3% of US cropland. The authors call this disadoption a concern for long-term soil health.

Checking cover crop stands with satellite images

A cover crop only protects soil where it actually grows. Satellite vegetation maps, such as NDVI from Sentinel-2, show where a stand is thin or missing across a whole field, which is useful on large farms or rented land you visit less often. The Farmonaut Satellite + AI Farm Monitoring System shows these maps by field. Satellites show plant cover and its change; they do not tell you the cause, so check problem spots on foot.

Related pages on our site: farm admin app, mobile app, satellite data API, API developer docs, carbon footprinting, crop loan and insurance tools, fleet management, product traceability.

▶ How satellite NDVI maps show plant cover and crop stress across a large farm. · 4:09

FAQ

What is the single best cover crop for erosion?

For most cold-winter grain farms, cereal rye, because it can be planted late, survives winter and covers the soil early in spring. In mild climates, annual ryegrass, oats or a grass-clover mix can work as well. The best choice depends on your planting window.

Do legumes stop erosion as well as grasses?

Not always. The ranges overlap: SARE’s summary shows legumes cut soil loss by 38% to 69%, while grass-type covers ranged from 31% to 100%. Mixing a legume with a grass gives both cover and nitrogen.

How much does a cover crop cost per acre?

For the eight covers in this guide, the SARE chart gave a median seed cost of about $12 to $35 per acre drilled, at 2006 prices, so expect more today. Add planting and termination costs. Use the calculator above with your own prices.

Can I get paid to plant cover crops?

In the US, the NRCS EQIP and CSP programs pay for practice 340 in many states. Pennsylvania’s fiscal year 2026 list shows $76.94 per acre for a single species. Check current rates and rules with your local office, and get professional advice on contracts.

When should I terminate a cover crop?

Before it competes with your cash crop for water and nitrogen, and in line with your crop insurance and program rules. Follow the herbicide label and local rules if you spray.