Benton County, Washington
Local growing conditions for Benton County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 11 ZIP codes in our data.
Hardiness zones in Benton County
Benton County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Benton County for its live forecast, frost dates, and planting calendar:
West Richland 98944
West Richland 99320
Kennewick 99336
Finley 99337
Kennewick 99338
Boardman 99345
Umatilla 99346
Prosser 99350
Richland 99352
West Richland 99353
Richland 99354
More for Washington
- Agriculture in Washington
- Frost dates across Washington
- 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.