Frost dates in Jefferson County, Idaho
The average last spring frost in Jefferson County falls May 9 to Jun 12 and the average first fall frost Sep 7 to Oct 5, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 4b to 5b. Places: Hamer, Lewisville, Menan, Mud Lake, Rigby, Roberts. 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 |
|---|---|---|---|---|
| 83425 | Hamer | Jun 3 | Sep 11 | 5a |
| 83431 | Lewisville | May 9 | Oct 5 | 5a |
| 83434 | Menan | May 9 | Oct 5 | 5a |
| 83435 | Jun 12 | Sep 7 | 4b | |
| 83442 | Rigby | May 9 | Oct 5 | 5b |
| 83444 | Roberts | Jun 3 | Sep 11 | 5a |
| 83450 | Mud Lake | Jun 3 | Sep 11 | 4b |
Nearby counties
Madison County Clark County Bonneville County Bingham County Fremont County Teton County
All Idaho counties · Download Idaho frost dates (CSV)
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