Dewey County, South Dakota
Local growing conditions for Dewey County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 7 ZIP codes in our data.
Hardiness zones in Dewey County
Dewey County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Dewey County for its live forecast, frost dates, and planting calendar:
Timber Lake 57656
Akaska 57601
North Eagle Butte 57625
Whitehorse 57630
Lantry 57636
Whitehorse 57661
More for South Dakota
- Agriculture in South Dakota
- Frost dates across South Dakota
- USDA hardiness zones explained
- Planting calendar by ZIP code
← All counties in South Dakota
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.