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Place calendarCrop Planting Dates in Illinois
Published planting and harvest windows for 6 crops in Illinois, in one calendar. Ranges only, with sources.
| Crop | Planting | Harvest |
|---|---|---|
| Alfalfa hay | May 9 to Sep 21 | |
| Corn | Planting: Apr 14 to Jun 5 | Sep 14 to Nov 20 |
| Sorghum | Planting: May 4 to Jul 6 | Sep 18 to Nov 20 |
| Soybeans | Planting: May 2 to Jun 24 | Sep 19 to Nov 7 |
| Spring oats | Planting: Mar 20 to May 12 | Jul 4 to Aug 13 |
| Winter wheat | Planting: Sep 28 to Nov 9 | Jun 15 to Jul 19 |
Calendar view
| Item | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Alfalfa hay harvest | Harvest window, most active in May | Harvest window, most active in June | Harvest window, most active in July | Harvest window, most active in August | Harvest window, most active in September | |||||||
| Corn planting | Planting window, most active in April | Planting window, most active in May | Planting window in June | |||||||||
| Corn harvest | Harvest window, most active in September | Harvest window, most active in October | Harvest window, most active in November | |||||||||
| Sorghum planting | Planting window, most active in May | Planting window, most active in June | Planting window in July | |||||||||
| Sorghum harvest | Harvest window, most active in September | Harvest window, most active in October | Harvest window, most active in November | |||||||||
| Soybeans planting | Planting window, most active in May | Planting window, most active in June | ||||||||||
| Soybeans harvest | Harvest window, most active in September | Harvest window, most active in October | Harvest window in November | |||||||||
| Spring oats planting | Planting window, most active in March | Planting window, most active in April | Planting window in May | |||||||||
| Spring oats harvest | Harvest window, most active in July | Harvest window, most active in August | ||||||||||
| Winter wheat planting | Planting window in September | Planting window, most active in October | Planting window in November | |||||||||
| Winter wheat harvest | Harvest window, most active in June | Harvest window, most active in July |
Frost-date caveat: published dates are averages. Find your own last and first frost dates and compare them with these ranges before you plant.
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.