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Corn planting and harvest datesCorn Planting Dates in Illinois
Usual corn planting and harvest periods in Illinois, shown as ranges with their source. Use them to frame a plan, then adjust for your own frost dates and soil temperature.
| Activity | Window | Source | Last verified |
|---|---|---|---|
| Planting | Apr 14 to Jun 5 usual (most active Apr 21 to May 23) | source | 2026-11-11 |
| Harvest | Sep 14 to Nov 20 usual (most active Sep 23 to Nov 5) | source | 2026-11-11 |
| Item | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Planting | Planting window, most active in April | Planting window, most active in May | Planting window in June | |||||||||
| Harvest | Harvest window, most active in September | Harvest window, most active in October | Harvest window, most active in November |
What these dates mean in Illinois
Planting usually runs about 53 days, from Apr 14 to Jun 5.
That start date is close to the middle of the 41 places in this data set that report corn planting dates (Apr 14).
Harvest usually runs about 68 days, from Sep 14 to Nov 20.
From the start of the planting window to the start of the harvest window is about 153 days in Illinois, a rough guide to how long the crop occupies the bed or field.
Related guides
- Corn (Sweet) Planting Calendar by Zone
- Corn Planting Calendar: Grain vs. Silage
- Corn Growth Stages and Calendar Timing
- Field Crop Planting Calendar for the Corn Belt
Corn dates in other places
- Alabama
- Arizona
- Arkansas
- California
- Colorado
- Delaware
- Florida
- Georgia
- Idaho
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maryland
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Virginia
- Washington
- West Virginia
- Wisconsin
- Wyoming
Other crops in Illinois
Last reviewed: November 2026. Source: USDA NASS, Field Crops Usual Planting and Harvesting Dates (October 2010 edition, copy hosted by Cornell University Mann Library). Dates are the usual start and end of the period when about 5% to 95% of the crop is planted or harvested, from long-run state progress data. They are historic averages, not a forecast.