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Place calendarCrop Planting Dates in Colorado
Published planting and harvest windows for 8 crops in Colorado, in one calendar. Ranges only, with sources.
| Crop | Planting | Harvest |
|---|---|---|
| Alfalfa hay | May 23 to Nov 9 | |
| Corn | Planting: Apr 19 to May 29 | Sep 28 to Nov 22 |
| Sorghum | Planting: May 9 to Jul 1 | Sep 29 to Nov 29 |
| Spring barley | Planting: Mar 14 to May 16 | Jul 20 to Sep 14 |
| Spring oats | Planting: Mar 17 to May 23 | Jul 13 to Sep 25 |
| Spring wheat | Planting: Mar 28 to May 23 | Jul 23 to Sep 29 |
| Sunflowers | Planting: May 19 to Jul 1 | Sep 27 to Nov 26 |
| Winter wheat | Planting: Sep 1 to Oct 11 | Jun 27 to Jul 29 |
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 | Harvest window, most active in October | Harvest window in November | |||||
| Corn planting | Planting window, most active in April | Planting window, most active in May | ||||||||||
| Corn harvest | Harvest window 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 in September | Harvest window, most active in October | Harvest window, most active in November | |||||||||
| Spring barley planting | Planting window, most active in March | Planting window, most active in April | Planting window, most active in May | |||||||||
| Spring barley harvest | Harvest window, most active in July | Harvest window, most active in August | Harvest window, most active in September | |||||||||
| Spring oats planting | Planting window, most active in March | Planting window, most active in April | Planting window, most active in May | |||||||||
| Spring oats harvest | Harvest window, most active in July | Harvest window, most active in August | Harvest window, most active in September | |||||||||
| Spring wheat planting | Planting window in March | Planting window, most active in April | Planting window, most active in May | |||||||||
| Spring wheat harvest | Harvest window in July | Harvest window, most active in August | Harvest window, most active in September | |||||||||
| Sunflowers planting | Planting window, most active in May | Planting window, most active in June | Planting window in July | |||||||||
| Sunflowers harvest | Harvest window in September | Harvest window, most active in October | Harvest window, most active in November | |||||||||
| Winter wheat planting | Planting window, most active in September | Planting window, most active in October | ||||||||||
| Winter wheat harvest | Harvest window 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.