Jefferson County, Missouri
Local growing conditions for Jefferson County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 16 ZIP codes in our data.
Hardiness zones in Jefferson County
Jefferson County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Jefferson County for its live forecast, frost dates, and planting calendar:
Arnold 63010
Barnhart 63012
Cedar Hill 63016
Crystal City 63019
Summer Set 63020
Raintree Plantation 63023
Fenton 63026
Festus 63028
De Soto 63047
Herculaneum 63048
Parkdale 63049
Hillsboro 63050
Scotsdale 63051
Arnold 63052
Kimmswick 63053
Pevely 63070
More for Missouri
- Agriculture in Missouri
- Frost dates across Missouri
- 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.