Frost dates in Idaho
Average last frost dates in Idaho run from April 6 in Lewiston to May 17 in Garden City.
| Place | Last frost | First frost |
|---|---|---|
| Ammon | May 9 | Oct 1 |
| Blackfoot | May 5 | Oct 3 |
| Boise City | Apr 24 | Oct 21 |
| Burley | May 7 | Oct 4 |
| Caldwell | Apr 29 | Oct 13 |
| Chubbuck | May 16 | Oct 2 |
| Coeur d'Alene | Apr 22 | Oct 18 |
| Eagle | Apr 30 | Oct 17 |
| Garden City | May 17 | Oct 12 |
| Hayden | Apr 22 | Oct 18 |
| Idaho Falls | May 9 | Oct 1 |
| Jerome | May 2 | Oct 14 |
| Kuna | Apr 24 | Oct 21 |
| Lewiston | Apr 6 | Oct 26 |
| Meridian | Apr 24 | Oct 21 |
| Middleton | Apr 29 | Oct 13 |
| Moscow | Apr 29 | Oct 2 |
| Mountain Home | May 2 | Oct 8 |
| Nampa | Apr 29 | Oct 13 |
| Pocatello | May 2 | Oct 11 |
| Post Falls | Apr 22 | Oct 18 |
| Rathdrum | Apr 22 | Oct 18 |
| Rexburg | May 12 | Sept 24 |
| Sandpoint | May 8 | Sept 28 |
| Star | Apr 29 | Oct 13 |
| Twin Falls | Apr 30 | Oct 9 |
Source: NOAA U.S. Climate Normals 1991–2020, nearest station to each place. Places of 10,000+ people (US Census Bureau, 2024 estimates) within 50 miles of a station.
When to plant in Idaho
- Asparagus
- Lima Beans
- Green Beans
- Beets
- Broccoli
- Brussels Sprouts
- Cabbage
- Chinese Cabbage
- Carrots
- Cauliflower
- Celery
- Swiss Chard
- Collard Greens
- Sweet Corn
- Cucumbers
- Eggplant
- Garlic
- Kale
- Leeks
- Lettuce
- Cantaloupe
- Okra
- Onions
- Onion Sets
- Peas
- Black-Eyed Peas
- Peppers
- Potatoes
- Radishes
- Rhubarb
- Spinach
- Summer Squash (Zucchini)
- Winter Squash
- Sweet Potatoes
- Tomatoes
- Turnips
- Watermelon