Frost dates in Bonneville County, Idaho
The average last spring frost in Bonneville County falls May 9 to Jun 20 and the average first fall frost Sep 1 to Oct 5, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 5a to 6a. Places: Ammon, Idaho Falls, Iona, Irwin, Lincoln, Ririe. Pick a ZIP for 10% and 90% odds, soil temperature and the 7-day freeze forecast.
| ZIP | Place | Last spring frost | First fall frost | Zone |
|---|---|---|---|---|
| 83120 | Jun 20 | Sep 1 | 5a | |
| 83285 | Jun 20 | Sep 1 | 5b | |
| 83401 | Lincoln | May 9 | Oct 1 | 5b |
| 83402 | Idaho Falls | May 23 | Sep 20 | 5b |
| 83404 | Idaho Falls | May 9 | Oct 1 | 5b |
| 83406 | Ammon | May 9 | Oct 1 | 5b |
| 83427 | Iona | Jun 9 | Sep 11 | 5b |
| 83428 | Irwin | Jun 13 | Sep 9 | 6a |
| 83443 | Ririe | Jun 9 | Sep 11 | 5b |
| 83449 | Swan Valley | Jun 9 | Sep 11 | 6a |
| 83454 | Ucon | May 9 | Oct 5 | 5b |
Nearby counties
Madison County Teton County Jefferson County Bingham County Caribou County Fremont County
All Idaho counties · Download Idaho frost dates (CSV)
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