Washington County, Kansas
Local growing conditions for Washington 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 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:
Barnes 66933
Clifton 66937
Greenleaf 66943
Haddam 66944
Hanover 66945
Hollenberg 66946
Linn 66953
Mahaska 66955
Morrowville 66958
Palmer 66962
Washington 66968
More for Kansas
- Agriculture in Kansas
- Frost dates across Kansas
- 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.