When to Plant Sunflowers in Idaho
In a typical Idaho location, sow outdoors May 7 – May 21. Across the state, the outdoor planting window starts as early as Apr 13 in Lewiston and as late as May 24 in Eagle. 2 cities in Idaho are essentially frost-free and can plant on a year-round schedule.
Direct sow 1-3 weeks after last frost once soil has warmed; taprooted, resents transplanting.
Sunflowers Planting Dates by City
| City | Direct sow |
|---|---|
| Boise | May 1 – May 15 |
| Meridian | May 1 – May 15 |
| Nampa | May 6 – May 20 |
| Idaho Falls | May 16 – May 30 |
| Pocatello | May 9 – May 23 |
| Caldwell | Apr 30 – May 14 |
| Coeur d'Alene | Apr 29 – May 13 |
| Twin Falls | May 7 – May 21 |
| Lewiston | Apr 13 – Apr 27 |
| Lewiston Orchards | Apr 13 – Apr 27 |
| Post Falls | Apr 29 – May 13 |
| Rexburg | May 22 – Jun 5 |
| Moscow | Frost-free: year-round planting |
| Eagle | May 24 – Jun 7 |
| Conda | Frost-free: year-round planting |
| Kuna | May 1 – May 15 |
| Ammon | May 16 – May 30 |
| Chubbuck | May 9 – May 23 |
| Hayden | Apr 29 – May 13 |
| Mountain Home | May 9 – May 23 |
| Blackfoot | May 12 – May 26 |
| Garden City | May 1 – May 15 |
| Jerome | May 9 – May 23 |
| Burley | May 14 – May 28 |
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 sunflowers in Idaho?
In a typical Idaho location, sow outdoors May 7 – May 21. Across the state, the outdoor planting window starts as early as Apr 13 in Lewiston and as late as May 24 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 sunflowers take to grow?
Sunflowers typically take 70–100 days from planting to harvest. Direct sow 1-3 weeks after last frost once soil has warmed; taprooted, resents transplanting.
Other Crops in Idaho
- Tomatoes
- Peppers
- Eggplant
- Cucumbers
- Zucchini
- Winter Squash
- Pumpkins
- Watermelon
- Cantaloupe
- Corn
- 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
- Zinnias
- Marigolds
- Cosmos
- Nasturtiums
- Dahlias
When to plant sunflowers in other states