Actual Custom Combining Rates Per Acre for Iowa Harvest
Custom combining rates in Iowa’s survey predate a 90% diesel jump since February. Here’s what that adds per acre, and how to price it.
Table of Contents
What custom combining costs per acre in Iowa this year
Iowa’s 2026 custom combining rates have a median of $45 per acre for corn and $42 for soybeans. These figures cover self-propelled combine harvesting of corn, soybeans, and small grain in Iowa, any make or model. They come from Iowa State University’s 2026 survey, and emissions era doesn’t change them.
What the survey rate includes
The survey rates bundle fuel, repairs, depreciation, interest, and operator labor into one per-acre charge. The data was collected in early February, when diesel was assumed at $2.89 a gallon.
Where to jump if you’re quoting vs hiring
- Hiring an operator: go to the rate table and add-ons.
- Quoting as an operator: go to the fuel adjustment and rate-setting sections.
- Weighing a combine purchase: skip to hire vs own.
For machines billed by the hour, see our hourly equipment rates by machine.
💵 About These Numbers: Rates come from Iowa State’s 2026 Iowa Farm Custom Rate Survey, based on 205 responses and 4,698 individual rates. The fuel adjustment uses USDA AMS September 2026 Iowa diesel prices. Local rates vary with machine availability, field conditions, and timing, so treat these figures as orientation, not a quote.
2026 combining rates by crop and header
Here are the 2026 Iowa combining rates per acre by crop and header type.
| Job | Median | Average | Range | Responses |
|---|---|---|---|---|
| Corn, standard head | $45.00 | $46.05 | $25–$80 | 119 |
| Corn, chopper head | $50.00 | $50.60 | $25–$80 | 61 |
| Soybeans, standard | $42.00 | $43.05 | $24–$70 | 94 |
| Soybeans, air reel | $46.00 | $47.00 | $26–$70 | 21 |
| Soybeans, draper head | $45.50 | $48.20 | $24–$80 | 95 |
| Small grain | $45.00 | $47.00 | $35–$65 | 13 |
Source: Iowa State University, 2026 Iowa Farm Custom Rate Survey (AgDM File A3-10).
Corn: standard vs chopper head
A chopper head adds about $5 per acre at the median. The small-grain line rests on only 13 responses, so treat it as a rough guide.
Soybeans: platform, draper, air reel
A draper or air reel pushes soybeans to roughly the corn rate. Don’t mistake the $48.20 draper average for the headline soybean rate. Some reports have made exactly that error.
Median or average — which to quote
The median is the middle response, so half of operators charge more and half charge less. ISU drops the single lowest and highest response when reporting the range. The median is the usual negotiating benchmark, and the full tables are on Iowa State’s 2026 Farm Custom Rate Survey page.
Add-ons that change the per-acre bill
The base combining rate is rarely the whole invoice.
Downed corn, GPS mapping, grain cart
These are 2026 medians, each added on top of the base rate:
- Downed corn: a corn reel adds $11 per acre.
- GPS mapping: adds $3.90 per acre.
- Grain cart: $8.75 per acre in corn and $8.00 in soybeans.
Cart pricing works like other custom tractor work rates.
Complete harvest: combine, cart, haul to bin
Complete harvest bundles the combine, grain cart, and hauling to farm storage. It has a median of $75 per acre for corn and $70 for soybeans, but the ranges reach $175. Get every quote itemized so you’re comparing the same package.
Converting per acre to per hour
Multiply the per-acre rate by your acres per hour to get an hourly equivalent. The Field Efficiency (Acres-Per-Hour) Calculator does the math. For reference, ISU puts the median wage for a hired harvest operator at $25 an hour.
Adjusting survey rates for $5.50 harvest diesel
To adjust a survey rate for today’s fuel, follow three steps:
- Look up gallons per acre: 1.25 for corn and 1.00 for soybeans.
- Find the price change: $5.50 − $2.89 = $2.61 per gallon.
- Multiply, then add the result to the survey median.
The $5.50 figure is USDA AMS’s September average Iowa farm diesel price, up 90% from February.
The fuel-only adder
| Crop | Survey median | Fuel adder | What It Means |
|---|---|---|---|
| Corn | $45.00 | +$3.26 | ~$48.26/acre floor |
| Soybeans | $42.00 | +$2.61 | ~$44.61/acre floor |
Sources: ISU A3-10 (rates); ISU A3-27 (fuel use); USDA AMS via ISU (diesel).
Corn fuel use typically runs 1.00–1.60 gallons per acre, which puts the corn adder anywhere from $2.61 to $4.18. The soybean figure is ISU’s older 1.00-gallon table value. Actual consumption can swing about 35% either way, as ISU’s fuel-per-acre estimates note.
Why ISU’s full-cost estimate runs higher
ISU’s machinery cost calculator raised one combine’s full ownership-and-operating cost from $46.36 to $51.39 per acre at $5.45 diesel. That’s an 11% increase. ISU also puts harvest rates 12–17% above the spring survey for high-fuel operations.
📉 Cost Reality: Our method multiplies ISU’s per-acre fuel estimates by the gap between the survey’s $2.89 February diesel and USDA AMS’s $5.50 September 2026 average. Treat the result as a minimum. ISU’s figures are the fuller estimate.
How custom operators should set their own rate
Survey medians describe the market, but your own costs set your floor.
Base rate plus actual fuel
ISU describes two ways to handle fuel this fall:
- Base rate plus actual fuel: charge a set per-acre rate, then bill fuel at what you actually paid.
- Customer-supplied fuel: the customer fills the combine from their own supply.
Either way, log your fuel use and purchase prices so the charge holds up if a customer questions it. Iowa State’s September fuel-cost update walks through the full reasoning.
What the rate has to cover
Your rate must recover ownership and operating costs across every custom acre you run. A $45 rate on an expensive machine may lose money. The Equipment Cost-Per-Hour Calculator helps you find your own break-even rate.
When hiring a combine beats owning one
Breakeven acres is the point where owning a combine costs the same as hiring one. The formula is:
Breakeven acres = annual ownership cost ÷ (custom rate per acre − your operating cost per acre)
It comes from Oklahoma State’s ownership-vs-custom breakeven method.
The breakeven-acres formula
Ownership cost covers depreciation, interest, insurance, and housing. Operating cost covers fuel, repairs, and labor. If you harvest fewer acres than your breakeven number, hiring is usually cheaper, even though a combine dealer won’t lead with that.
What the formula leaves out: timeliness
Owning means you harvest when your crop is ready, not when the custom operator reaches you. In a wet fall, that timing is worth real money. Put a dollar figure on it honestly rather than letting it justify a purchase the numbers don’t support.
Why your quote doesn’t match the survey
A quote well above or below the median isn’t necessarily unfair.
Local factors ISU names
ISU lists several reasons local rates differ from the survey:
- how many machines are available nearby
- timeliness
- operator skill
- field size and shape
- crop conditions
- how the machine performs
Using Iowa rates outside Iowa
Nebraska’s 2024 survey showed dryland corn at $45 and soybeans at $46 per acre, so neighboring states track fairly close. See Nebraska’s harvest custom-rate guidance for the details. For forage work, compare our custom hay baling rates.
Custom combining rates: FAQ
1. What’s the custom rate for combining corn in Iowa?
The 2026 Iowa survey median is $45 per acre for corn combining, or $50 with a chopper head.
2. What’s the custom rate for combining soybeans?
Custom combining for soybeans has a 2026 median of $42 per acre, or $45.50 with a draper head.
3. Do custom combining rates include fuel?
Yes. Iowa survey rates include fuel and operator labor, priced at the February assumption of $2.89 diesel.
4. Should I quote the median or average combining rate?
Use the median combining rate. Half of Iowa respondents charge more and half charge less, which makes it the fairest negotiating benchmark.
5. What does a grain cart add to custom harvest?
A grain cart adds a median of $8.75 per acre in corn and $8.00 in soybeans to custom harvest.
6. What does complete custom harvest cost?
Complete custom harvest, meaning combine, cart, and hauling to storage, has a median of $75 per acre for corn and $70 for soybeans.
7. How much extra for downed corn?
Custom combining downed corn adds a median of $11 per acre for the corn reel, on top of the base rate.
8. How do I add a fuel surcharge to combining rates?
Multiply gallons per acre by the diesel increase since February. At $5.50 diesel, that adds about $3.26 per acre for corn and $2.61 for soybeans.
9. Do Iowa combining rates apply in other states?
Iowa combining rates track fairly close to neighboring states. Nebraska’s 2024 survey showed dryland corn at $45 and soybeans at $46 per acre.
10. When should I own a combine instead of hiring?
Own a combine only when your acres exceed breakeven: annual ownership cost divided by the custom rate minus your operating cost.
Your next step
Start with the $45 corn and $42 soybean medians, then add at least the fuel adder for September diesel: about $3.26 per acre for corn and $2.61 for soybeans. Itemize every quote so add-ons are visible. If you run your own machine, work out your real per-acre cost before you price a single acre.
