Farm Harrow Types, Uses and Cost per Acre

A farm harrow is a tractor-drawn tool that breaks up clods, levels the surface and disturbs small weeds to leave a seedbed for planting. The ASAE tillage terminology standard (S414.1, 1990 revision reaffirmed 1998, hosted by USDA NRCS) lists harrows (spring, spike, coil or tine tooth, and disk) as secondary tillage tools, and calls seedbed preparation the final secondary tillage operation. This guide covers the main harrow types, how to choose one, what research says about weed control, and what a pass costs per acre in 2026, with a calculator for your own fields.

What a farm harrow does

Primary tillage, such as ploughing or chiselling, opens up the soil. A harrow then works the top few inches. It crumbles lumps, evens out the surface and, with the right timing, pulls out weeds that have just germinated. Planters and drills place seed more evenly into a fine, level seedbed.

Some harrows are also used after planting. The same ASAE standard describes cultivating tillage as shallow work after planting that loosens the soil or removes unwanted plants. A tine harrow or rotary hoe pulled over a young crop is an example.

• Level the field: an even surface helps planters hold a steady depth.
• Break clods: smaller soil pieces make better contact with seed.
• Mix in residue: disk harrows cut and partly bury crop residue.
• Check weeds: shallow passes remove small seedlings before they root.

Types of harrow and when each fits

The ASAE standard defines a disk harrow as a primary or secondary tillage tool with two or four gangs of concave disks, where the gang angle sets how hard it cuts. A single disk harrow has two gangs and a tandem disk harrow has four. Tine, spike and spring-tooth harrows work lighter and shallower.

The ASAE standard describes harrows as having staggered teeth of rigid spikes, coil-spring wires, flat-spring bars or S-shaped spring bars, and lists power-oscillated spike-tooth harrows among the types. It defines rotary tillers as using a power-driven shaft. Chain and drag harrows are the lightest of these tools, used to level the surface.

For a wider list of hand and tractor tools, see our guide to farm tool names.

How to choose a harrow

Start with the soil and the residue, then match the tool to your tractor and the time you have. Use this order.

1. Soil and residue. Heavy soils with stalk residue call for disks. Light soils and clean seedbeds suit tines.
2. Crop. Large-seeded crops such as corn and soybeans can take a rotary hoe or tine harrow after planting. Rotary hoeing is limited to large-seeded crops such as corn and soybeans (Wisconsin Extension), so small-seeded crops need a gentler tool or no pass after seeding.
3. Tractor size. A wider harrow covers more ground per hour but needs more drawbar pull. Match width to your tractor, and fold-up wings help on the road.
4. Speed and timing. Machinery tables from University of Wisconsin Extension, based on ASAE data, list suggested speeds of 3.5 to 6.5 mph for disks and 5 to 8 mph for field cultivators, with field efficiency of 0.7 to 0.9 for both.
5. Total cost. Add purchase, repairs, fuel and labour, not only the price tag. The cost section below shows real figures.

Keep the machine in good order. Worn tines and blunt disks do poor work. Our guide to preventive maintenance of farm tools has a service checklist.

Which harrow for which crop

The right tool follows the crop and the stage. Match the work to what the plant can take.

• Corn and soybeans: large seeds are planted deep, so a rotary hoe or tine harrow can run after planting if timing is right. Disks suit stalk-heavy fields before planting.
• Vegetables: small seeds need a fine, level bed, so a spring-tooth or tine harrow after disking can give the finish. Avoid aggressive passes after seeding.
• Cereals: tine harrows can work in organic cereals, but the Inagro advice is to avoid mechanical control between crop emergence and the three-leaf stage.

How to run a harrow pass: five steps

1. Check soil moisture. Squeeze a handful. If it smears, wait.
2. Set the tool. Adjust gang angle or tine pitch for the work. Start light and look at the result.
3. Pick a speed in the range for the tool. Use the maker’s manual and the ranges above.
4. Drive straight and keep overlap small. Use the same wheel tracks each pass where you can.
5. Look back. Dig a few spots to check depth, clod size and weed pull-up, then adjust.

Harrow weed control: what the research shows

Harrowing works best on weeds that have just germinated. University of Wisconsin Extension advice for the rotary hoe is that hoeing should start when weed seeds have germinated but are still white, about 5 to 7 days after planting or just before crop emergence. A second pass 5 to 10 days later is suggested for farms that depend on the hoe, and the best results come at 7 to 10 mph. Soils should be fairly dry so that flipped-out weeds do not take root again. The same note adds that cool weather after planting can make 5 to 7 days too early, so watch crop development, and says to expect about 10% crop seedling loss, so raise the seeding rate to allow for it.

Ontario’s agronomy guide gives a similar warning for soybeans. Rotary hoeing can typically cut the bean stand by 5% to 10%, although the guide says the extra beans that emerge more than make up for this. Hoeing at the hook stage of emergence causes significant plant losses.

Results differ by tool. In organic cereal trials in Belgium, summarised by the European Commission’s CAP Network, a precision tined harrow had the best effect on soil and weeds, and two passes doubled the effect on weeds. The rotary hoe mainly broke the crust. In maize trials in Tuscany, Italy (2000 and 2001), a spring-tine harrow had operating advantages but gave poor work quality, and maize yield was higher with hoeing than with harrowing, although the authors say other factors than weed control probably played a part.

The lesson is to treat harrowing as one step in a weed plan, not a full replacement. If you also use herbicides, follow the product label and local rules, and ask your extension agronomist how passes and sprays fit together.

What a harrow pass costs per acre

Hiring a contractor gives a clear price per acre. Texas A&M AgriLife Extension’s custom rate survey, run from August to October 2025 and published in February 2026, reports average rates that include the operator, machine and fuel. Tandem and offset disks average about US$24 per acre, a field cultivator (spring-tooth harrow) about US$19, and a rotary hoe about US$14.

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Texas custom rates for tillage passes

Average rate in US$ per acre, including operator, machine and fuel; survey of Texas providers and users of custom work, conducted August to October 2025 and published 2026

Canadian figures show how widely rates range by machine. The Manitoba Agriculture 2026/2027 machinery guide gives custom rate ranges in Canadian dollars, with harrows at the low end: its 60 to 90 ft units are rated at 51 acres an hour.

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Manitoba custom rate ranges for soil work

Average custom rate in C$ per acre, low to high (a guideline), 2026/2027

What owning a harrow costs over time

Owning a harrow adds repair cost that grows with use. Wisconsin Extension’s table, built on ASAE standards, shows repair costs over a 10-year life as a share of list price. A disk used 100 hours a year accrues 18% of its list price in repairs, against 27% for a field cultivator or spring-tooth harrow. At 200 hours a year those figures rise to 58.5% and 71.3%.

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Repair cost rises faster than hours of use

Accumulated repair cost over a 10-year life, % of list price, by annual hours of use

Finally, harrowing is only one part of machinery cost. Illinois Farm Business Farm Management records for central Illinois corn on high-productivity farmland, summarised by farmdoc daily (October 2025), show machine costs rose from US$136 per acre in 2021 to US$171 in 2024.

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Whole-farm machinery cost per acre, central Illinois corn

US$ per acre in 2024 by cost type, all machinery on the farm; total US$171 (US$136 in 2021)

Harrow pass cost calculator

Use the calculator below to compare the cost of harrow passes with the herbicide pass you might skip. The numbers are examples near break-even. Replace them with your own machine, price and field data.

Try the numbers for your own farm below.

Smart and precision harrows

Makers now sell harrows with hydraulic depth control, sensors, GPS guidance and modular tool bars. These options may raise field efficiency, because guidance may cut overlap and gaps, and efficiency is one of the inputs in the calculator above. We do not print percentage savings for sensor or AI harrows here, because there is no independent trial data we can cite for them. Ask a maker for field trial results from your region, and check them against your state extension service before you pay for options.

Precision tools also depend on good records. A pass log with date, speed, depth and soil moisture lets you compare fields and see which setting worked.

▶ Six plain steps to start precision farming without buying a robot. · 4:18

Using satellite maps with harrow work

A harrow pass changes the seedbed, and the effect shows later in how evenly the crop emerges. Satellite vegetation maps, such as those in the Farmonaut Satellite + AI Farm Monitoring System, let you compare fields through the season and spot patches that emerge late or grow slowly. A map shows the change in plant cover, not the cause, so walk the patch to check for crusting, compaction or weeds.

▶ How satellite NDVI maps show crop stress before you can see it from the ground. · 4:09

When not to harrow, and soil care

Work the soil only when it is fit. Wet soil smears and forms clods. Wisconsin Extension also notes that soils should be relatively dry when weeds are flipped out, so they do not re-root. Every pass uses fuel and time, so skip passes that add nothing.

Cover crops need a seedbed too, so match the tool to the crop that follows.

▶ Seven easy ways to protect soil and water on the farm. · 4:34

Buying new or used, and sizing the job

Before you buy, work out how many hours the harrow will run in a year. Multiply your acres by the passes you plan, then divide by the acres covered per hour, which the calculator gives you. The Wisconsin repair table shows why this matters: repair cost for the same machine rises sharply as annual hours go up, so a lightly used harrow wears slowly, while a heavily used one needs far more repairs.

If you only need a harrow for a few days each spring, compare the hire rates above with the ownership cost. A used machine can cut the purchase price, but check disks, bearings, tines, hitch points and hydraulic hoses, and ask for the service history. Size the machine to the tractor you have, not the one you hope to buy.

Safety around harrows

Harrows have wide wings, sharp disks and heavy folding parts. Stop the engine and lower the machine before you inspect or clear it. Lock folding wings for road transport, check lights and slow-moving-vehicle signs, and keep bystanders clear. Follow the operator’s manual and your local transport rules.

Common harrow mistakes

• Starting too late, when weeds are past the white-thread stage.
• Running too fast or too slow for the tool.
• Harrowing wet soil.
• Ignoring seedling loss when you set the seeding rate.
• Leaving worn tines or blunt disks in service.

Related pages on our site: fleet management, carbon footprinting, product traceability, crop loans and insurance, satellite weather API docs, satellite API, agro admin app, app download, slope erosion control.

FAQ

What is a harrow used for in farming?

A harrow breaks clods, levels the soil and removes small weeds to make a seedbed. The ASAE tillage standard lists harrows as secondary tillage tools.

What is the difference between a disk harrow and a tine harrow?

A disk harrow uses concave disks that cut soil and residue, and the gang angle sets how aggressive it is. A tine harrow uses teeth that comb the surface, so it works shallower and suits weed control and crust breaking.

How much does it cost to harrow an acre?

Averages in the Texas survey published in 2026 are about US$24 for tandem and offset disks and about US$19 for a field cultivator or spring-tooth harrow, including operator, machine and fuel. Your own cost depends on width, speed, hourly machine cost and acres, which the calculator covers.

When should I harrow for weed control?

Wisconsin Extension advice for rotary hoeing is to start while weeds are still white thread, about 5 to 7 days after planting or just before crop emergence (later if the weather is cool), and repeat 5 to 10 days later if you rely on it. Check crop stage first, since early seedlings can be damaged.

Does harrowing replace herbicides?

Not on its own. Trials show results vary by tool, timing and soil, and harrowing can cost some crop stand. Treat it as one part of a weed plan, and follow product labels and local rules for any spray.

What field speed should I use?

Wisconsin Extension machinery tables list 3.5 to 6.5 mph for disks and 5 to 8 mph for field cultivators. Rotary hoeing is advised at 7 to 10 mph. Follow your maker’s manual for your machine.