Frost dates in Hill County, Montana
The average last spring frost in Hill County falls May 15 to May 24 and the average first fall frost Sep 15 to Sep 25, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 3b to 4a. Places: Gildford, Herron, Hingham, Inverness, Kremlin, Rocky Boy's Agency. 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 |
|---|---|---|---|---|
| 59501 | Herron | May 15 | Sep 23 | 3b |
| 59521 | Rocky Boy's Agency | May 17 | Sep 25 | 4a |
| 59525 | Gildford | May 24 | Sep 15 | 3b |
| 59528 | Hingham | May 24 | Sep 15 | 4a |
| 59530 | Inverness | May 21 | Sep 19 | 4a |
| 59532 | Kremlin | May 24 | Sep 15 | 4a |
| 59540 | Rudyard | May 21 | Sep 19 | 3b |
Nearby counties
Liberty County Chouteau County Blaine County Toole County Pondera County Cascade County
All Montana counties · Download Montana frost dates (CSV)
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