St. Louis County, Missouri
Local growing conditions for St. Louis County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 43 ZIP codes in our data.
Hardiness zones in St. Louis County
St. Louis County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in St. Louis County for its live forecast, frost dates, and planting calendar:
Wildwood 63005
Ballwin 63011
Chesterfield 63017
Ballwin 63021
Eureka 63025
Florissant 63031
Black Jack 63033
Old Jamestown 63034
Wildwood 63038
Wildwood 63040
Hazelwood 63042
Maryland Heights 63043
Bridgeton 63044
Bridgeton 63045
St. Ann 63074
Valley Park 63088
Clayton 63105
Overland 63114
Richmond Heights 63117
Webster Groves 63119
Normandy 63121
Kirkwood 63122
Affton 63123
Ladue 63124
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.