Ag Minute: Why Farmers Don't Sell Everything at Harvest

As the 2026 harvest comes to an end across Central Illinois, millions of bushels of corn and soybeans are being tucked away in grain bins rather than immediately sold. For many farmers, deciding when to sell their crops can be just as important as deciding when to plant or harvest them.

Corn and soybean prices fluctuate throughout the year, influenced by weather, global demand, transportation costs and the amount of grain available on the market.

During harvest, large quantities of grain become available in a relatively short period. That additional supply can put downward pressure on local prices, making it less attractive for farmers to sell everything immediately.

Instead, many farmers store a portion of their crops in large metal grain bins, hoping to take advantage of better prices later in the year or the following spring.

Research published in September by the University of Illinois found that local corn prices typically face their greatest seasonal pressure during October, when harvest activity is at its peak.

The study examined grain elevator prices across the Corn Belt from 2010 through 2025 and found that the difference between local cash prices and futures market prices, known as basis, typically weakens during harvest before recovering. In Illinois, that seasonal difference has historically averaged about 19 cents per bushel at its lowest point compared with later weeks.

That might not sound like much, but consider a farmer holding 50,000 bushels of corn. A 19-cent improvement in the local basis, assuming futures prices remain unchanged, would mean an additional $9,500 in gross revenue before storage expenses.

Of course, waiting doesn't guarantee a better price.

Grain storage comes with expenses, including electricity, drying equipment, maintenance and the cost of keeping grain in good condition. Farmers who store grain at commercial elevators may also face storage fees that increase the longer their crops remain there. Interest costs and the risk of grain spoilage can also eat into potential profits.

There is also the financial reality of running a farm. Seed, fertilizer, equipment, land payments and other expenses continue long after the combines have stopped running. Some farmers need to sell grain immediately to pay bills, while others have enough financial flexibility to wait for a more favorable market.

The decision can be especially challenging because farmers have little control over the prices they receive. A strong harvest in South America, changes in international trade or unexpected shifts in demand can cause prices to fall even when farmers expect them to rise.

The issue remains particularly relevant this fall. During a November 12 agricultural market discussion hosted by Illinois Public Media and University of Illinois Extension, analysts noted that farmers holding corn in storage had contributed to stronger local cash grain basis levels in parts of the eastern Corn Belt. With some farmers reluctant to sell, grain buyers have had to offer more competitive prices to encourage deliveries.

Not every bushel sitting in a grain bin is necessarily waiting to be priced. Some farmers arrange sales ahead of time and store the grain until delivery, while others sell portions of their harvest at different points throughout the year to spread their risk.

For many Central Illinois farming families, the goal is not necessarily to sell at the highest possible price. It is to find a price that covers expenses, provides a reasonable return and allows them to prepare for another growing season.

So while the fields may be empty and the equipment parked for winter, important decisions about this year's harvest are still being made. For farmers, bringing in the crop is only part of the business. Knowing when to sell it is another challenge entirely.