Washington County, Minnesota
Local growing conditions for Washington 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 Washington County
Washington County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Washington County for its live forecast, frost dates, and planting calendar:
Afton 55001
Bayport 55003
Cottage Grove 55016
Hugo 55038
Lake Elmo 55042
Lakeland 55043
Scandia 55047
Newport 55055
St. Paul Park 55071
Scandia 55073
Stillwater 55082
Willernie 55090
Mahtomedi 55115
Woodbury 55125
Oakdale 55128
Woodbury 55129
More for Minnesota
- Agriculture in Minnesota
- Frost dates across Minnesota
- 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.