Frost dates across Idaho
Typical last spring frost, first fall frost, and USDA zone for 7 Idaho cities, from 30-year NOAA climate normals. Every date is a 50 percent odds line, not a promise. Pick a city for the full frost window and what is plantable there now.
Not on the list? Any Idaho ZIP works.
| City | Last spring frost | First fall frost | Season length | Zone |
|---|---|---|---|---|
| Boise | Apr 24 | Oct 21 | about 180 days | 7a |
| Meridian | Apr 24 | Oct 21 | about 180 days | 7a |
| Nampa | Apr 29 | Oct 13 | about 167 days | 7a |
| Idaho Falls | May 9 | Oct 1 | about 145 days | 5b |
| Coeur d'Alene | Apr 22 | Oct 18 | about 179 days | 6b |
| Twin Falls | Apr 30 | Oct 9 | about 162 days | 6b |
| Lewiston | Apr 6 | Oct 26 | about 203 days | 7b |
Row & Bed is a plant reference built around your garden: your zone, your frost dates, your forecast, and a cited page for every variety in your beds.
Set up your garden