Washington County, Oregon
Local growing conditions for Washington County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 23 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:
Aloha 97003
Beaverton 97008
Beaverton 97005
Beaverton 97006
Beaverton 97007
Tualatin 97062
Aloha 97078
Banks 97106
Vernonia 97109
Cornelius 97113
Forest Grove 97116
Banks 97117
Cherry Grove 97119
Hillsboro 97123
Hillsboro 97124
Banks 97125
North Plains 97133
Sherwood 97140
Vernonia 97144
Tigard 97223
Tigard 97224
West Slope 97225
Bethany 97229
More for Oregon
- Agriculture in Oregon
- Frost dates across Oregon
- 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.