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ILLINOIS WEATHER

Cooler Weather Lifts 2025 Corn Yields

Cooler Weather Lifts 2025 Corn Yields


By Scout Nelson

The 2025 corn yield outlook has improved across much of the Corn Belt as cooler late season temperatures extended grain filling and boosted potential harvest numbers. Most corn has reached the black layer stage, except in northern and northeastern areas such as North Dakota, Minnesota, Michigan, northern Iowa, and parts of Indiana and Ohio.

During the final grain-filling period, the western edge of the Corn Belt, including Nebraska and Kansas, experienced below-normal temperatures. This slowed crop development at the end of the season and allowed for a few extra days of grain filling.

Rainfall remained below normal across most locations, though parts of Kansas and Nebraska received above-average precipitation.

Forecasts based on average 2025 planting dates now show a higher probability of yields meeting or exceeding long-term averages. For irrigated corn, nine of thirteen sites are projected to achieve above-average yields.

Cooler weather during the past three weeks increased expected irrigated yields compared to both the previous forecast and the 2024 season.

Rainfed corn is also showing strong potential. Nearly half of the 39 rainfed sites are forecasted for above-average yields, while about one-third expect near-average results.

Above-average outcomes are most likely in Minnesota, Nebraska, Kansas, western Missouri, and western Iowa. Only a few locations, including western Nebraska and eastern Illinois, are predicted to finish below average.

In the eastern Corn Belt—Illinois, Indiana, Michigan, and Ohio—yield predictions improved thanks to high sunlight and cooler night temperatures during late grain filling. Overall, the region’s dryland yield forecast for 2025 surpasses both the 2024 season and long-term averages.

Regional data suggest that overall yield potential is about eight percent above the long-term average. These forecasts represent location-wide estimates and do not account for field-specific challenges such as disease, flooding, hail, or replanting needs, which could reduce actual yields.

With favorable late season conditions, the 2025 corn harvest is positioned for a stronger finish, providing an encouraging outlook for both irrigated and rainfed production across the Corn Belt.

Photo Credit:gettyimages-oticki.


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