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Corn planting and harvest datesCorn Planting Dates in Colorado
Usual corn planting and harvest periods in Colorado, 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 19 to May 29 usual (most active Apr 28 to May 20) | source | 2026-11-11 |
| Harvest | Sep 28 to Nov 22 usual (most active Oct 8 to Nov 13) | 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 | ||||||||||
| Harvest | Harvest window in September | Harvest window, most active in October | Harvest window, most active in November |
What these dates mean in Colorado
Planting usually runs about 41 days, from Apr 19 to May 29.
That start date is about 5 days later than the middle of the 41 places in this data set that report corn planting dates (Apr 14).
Harvest usually runs about 56 days, from Sep 28 to Nov 22.
From the start of the planting window to the start of the harvest window is about 162 days in Colorado, 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
- Delaware
- Florida
- Georgia
- Idaho
- Illinois
- 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 Colorado
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.