Lewis and Clark County, Montana
Local growing conditions for Lewis and Clark 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 Lewis and Clark County
Lewis and Clark County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Lewis and Clark County for its live forecast, frost dates, and planting calendar:
Augusta 59410
Helena West Side 59601
Helena Valley Northeast 59602
Helena 59623
Helena 59625
Canyon Creek 59633
Spokane Creek 59635
Helena West Side 59636
Lincoln 59639
Marysville 59640
Wolf Creek 59648
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.