When to Plant Corn in Colorado
In a typical Colorado location, sow outdoors May 3 – May 17. Across the state, the outdoor planting window starts as early as Apr 14 in Grand Junction and as late as Jun 21 in Edwards.
Direct sow at last frost to 2 weeks after, once soil reaches 60F; does not transplant well. Succession sow every 2 weeks.
Corn Planting Dates by City
| City | Direct sow |
|---|---|
| Denver | Apr 30 – May 14 |
| Colorado Springs | May 3 – May 17 |
| Aurora | May 4 – May 18 |
| Fort Collins | May 2 – May 16 |
| Lakewood | May 3 – May 17 |
| Thornton | May 2 – May 16 |
| Westminster | May 2 – May 16 |
| Arvada | May 5 – May 19 |
| Centennial | May 5 – May 19 |
| Pueblo | Apr 30 – May 14 |
| Greeley | May 2 – May 16 |
| Boulder | May 6 – May 20 |
| Highlands Ranch | May 5 – May 19 |
| Longmont | May 7 – May 21 |
| Loveland | May 10 – May 24 |
| Broomfield | May 2 – May 16 |
| Grand Junction | Apr 14 – Apr 28 |
| Castle Rock | May 9 – May 23 |
| Commerce City | May 4 – May 18 |
| Parker | May 9 – May 23 |
| Littleton | May 2 – May 16 |
| Northglenn | May 2 – May 16 |
| Brighton | May 3 – May 17 |
| Dakota Ridge | May 2 – May 16 |
| Englewood | May 2 – May 16 |
| Security-Widefield | May 3 – May 17 |
| Windsor | May 3 – May 17 |
| Ken Caryl | May 2 – May 16 |
| Wheat Ridge | May 5 – May 19 |
| Pueblo West | Apr 26 – May 10 |
Showing the 30 most populous of 65 Colorado cities. Dates are estimates from each city's NOAA frost normals and university extension timing guidelines. See all Colorado cities.
Frequently Asked Questions
When should I plant corn in Colorado?
In a typical Colorado location, sow outdoors May 3 – May 17. Across the state, the outdoor planting window starts as early as Apr 14 in Grand Junction and as late as Jun 21 in Edwards.
When is the last frost in Colorado?
The average last spring frost in Colorado ranges from April 14 in Grand Junction to June 21 in Edwards, based on NOAA 1991–2020 climate normals.
How long do corn take to grow?
Corn typically take 60–100 days from planting to harvest. Direct sow at last frost to 2 weeks after, once soil reaches 60F; does not transplant well. Succession sow every 2 weeks.
Other Crops in Colorado
- Tomatoes
- Peppers
- Eggplant
- Cucumbers
- Zucchini
- Winter Squash
- Pumpkins
- Watermelon
- Cantaloupe
- Green Beans
- Peas
- Lettuce
- Spinach
- Kale
- Arugula
- Swiss Chard
- Broccoli
- Cauliflower
- Cabbage
- Brussels Sprouts
- Carrots
- Beets
- Radishes
- Turnips
- Onions
- Garlic
- Potatoes
- Sweet Potatoes
- Asparagus
- Basil
- Cilantro
- Parsley
- Dill
- Oregano
- Thyme
- Sunflowers
- Zinnias
- Marigolds
- Cosmos
- Nasturtiums
- Dahlias
When to plant corn in other states