Frost dates in Cascade County, Montana
The average last spring frost in Cascade County falls May 6 to Jun 6 and the average first fall frost Sep 10 to Oct 1, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 4a to 4b. Places: Black Eagle, Fort Shaw, Great Falls, Hardy, Malmstrom AFB, Monarch. 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 |
|---|---|---|---|---|
| 59401 | Great Falls | May 6 | Oct 1 | 4b |
| 59404 | Sun Prairie | May 6 | Oct 1 | 4b |
| 59405 | Malmstrom AFB | May 12 | Sep 28 | 4b |
| 59412 | Riceville | May 22 | Sep 23 | 4b |
| 59414 | Black Eagle | May 6 | Oct 1 | 4b |
| 59421 | Hardy | Jun 4 | Sep 12 | 4b |
| 59443 | Fort Shaw | Jun 2 | Sep 10 | 4b |
| 59463 | Monarch | Jun 6 | Sep 12 | 4b |
| 59465 | Neihart | Jun 6 | Sep 12 | 4b |
| 59472 | Sand Coulee | May 6 | Oct 1 | 4b |
| 59477 | Simms | Jun 2 | Sep 10 | 4b |
| 59480 | Stockett | May 22 | Sep 23 | 4b |
| 59483 | Sun River | Jun 2 | Sep 10 | 4a |
| 59485 | Ulm | Jun 2 | Sep 10 | 4a |
| 59487 | Vaughn | Jun 2 | Sep 10 | 4a |
Nearby counties
Chouteau County Teton County Lewis and Clark County Judith Basin County Meagher County Broadwater County
All Montana counties · Download Montana frost dates (CSV)
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