Big Horn County, Montana
Local growing conditions for Big Horn County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 11 ZIP codes in our data.
Hardiness zones in Big Horn County
Big Horn County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Big Horn County for its live forecast, frost dates, and planting calendar:
Fort Smith 59035
Busby 59016
Crow Agency 59022
Sheridan 59025
Crow Agency 59031
Hardin 59034
Forty Mile Colony 59050
Pompeys Pillar 59064
Pryor 59066
St. Xavier 59075
Wyola 59089
More for Montana
- Agriculture in Montana
- Frost dates across Montana
- USDA hardiness zones explained
- Planting calendar by ZIP code
County growing conditions are compiled from our ZIP-code database, USDA hardiness-zone data, and NOAA climate normals. Conditions vary within a county by elevation and local microclimate. Page updated Aug 4, 2026.