Frost dates in Big Horn County, Montana
The average last spring frost in Big Horn County falls May 7 to May 23 and the average first fall frost Sep 15 to Oct 5, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 4b to 5a. Places: Busby, Crow Agency, Fort Smith, Hardin, Lodge Grass, Pompeys Pillar. 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 |
|---|---|---|---|---|
| 59016 | Busby | May 23 | Sep 15 | 5a |
| 59022 | Crow Agency | May 23 | Sep 15 | 4b |
| 59025 | May 18 | Sep 24 | 5a | |
| 59031 | May 13 | Sep 29 | 4b | |
| 59034 | Hardin | May 13 | Sep 29 | 4b |
| 59035 | Fort Smith | May 7 | Oct 5 | 5a |
| 59050 | Lodge Grass | May 21 | Sep 17 | 5a |
| 59064 | Pompeys Pillar | May 13 | Sep 29 | 4b |
| 59066 | Pryor | May 14 | Sep 24 | 5a |
| 59075 | St. Xavier | May 7 | Oct 5 | 5a |
| 59089 | Wyola | May 21 | Sep 17 | 4b |
Nearby counties
Treasure County Yellowstone County Rosebud County Carbon County Musselshell County Stillwater County
All Montana counties · Download Montana frost dates (CSV)
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