When to Plant Corn in Idaho
In a typical Idaho location, sow outdoors Apr 30 – May 14. Across the state, the outdoor planting window starts as early as Apr 6 in Lewiston and as late as May 17 in Eagle. 2 cities in Idaho are essentially frost-free and can plant on a year-round schedule.
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 |
|---|---|
| Boise | Apr 24 – May 8 |
| Meridian | Apr 24 – May 8 |
| Nampa | Apr 29 – May 13 |
| Idaho Falls | May 9 – May 23 |
| Pocatello | May 2 – May 16 |
| Caldwell | Apr 23 – May 7 |
| Coeur d'Alene | Apr 22 – May 6 |
| Twin Falls | Apr 30 – May 14 |
| Lewiston | Apr 6 – Apr 20 |
| Lewiston Orchards | Apr 6 – Apr 20 |
| Post Falls | Apr 22 – May 6 |
| Rexburg | May 15 – May 29 |
| Moscow | Frost-free: year-round planting |
| Eagle | May 17 – May 31 |
| Conda | Frost-free: year-round planting |
| Kuna | Apr 24 – May 8 |
| Ammon | May 9 – May 23 |
| Chubbuck | May 2 – May 16 |
| Hayden | Apr 22 – May 6 |
| Mountain Home | May 2 – May 16 |
| Blackfoot | May 5 – May 19 |
| Garden City | Apr 24 – May 8 |
| Jerome | May 2 – May 16 |
| Burley | May 7 – May 21 |
Showing the 24 most populous of 24 Idaho cities. Dates are estimates from each city's NOAA frost normals and university extension timing guidelines. See all Idaho cities.
Frequently Asked Questions
When should I plant corn in Idaho?
In a typical Idaho location, sow outdoors Apr 30 – May 14. Across the state, the outdoor planting window starts as early as Apr 6 in Lewiston and as late as May 17 in Eagle. 2 cities in Idaho are essentially frost-free and can plant on a year-round schedule.
When is the last frost in Idaho?
The average last spring frost in Idaho ranges from April 6 in Lewiston to May 17 in Eagle, 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 Idaho
- 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