Valley County, Montana
Local growing conditions for Valley County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 10 ZIP codes in our data.
Hardiness zones in Valley County
Valley County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Valley County for its live forecast, frost dates, and planting calendar:
St. Marie 59231
Frazer 59225
Glasgow 59230
Opheim 59240
Hinsdale 59241
St. Marie 59244
Nashua 59248
Opheim 59250
Opheim 59260
Hinsdale 59273
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.