Williamson County, Texas
Local growing conditions for Williamson County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 19 ZIP codes in our data.
Hardiness zones in Williamson County
Williamson County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Williamson County for its live forecast, frost dates, and planting calendar:
Florence 76527
Granger 76530
Sonterra 76537
Bartlett 76573
Taylor 76574
Thrall 76578
Cedar Park 78613
Coupland 78615
Georgetown 78626
Georgetown 78628
Georgetown 78633
Hutto 78634
Liberty Hill 78642
Round Rock 78664
Round Rock 78665
Weir 78674
Round Rock 78681
Austin 78717
Austin 78729
More for Texas
- Agriculture in Texas
- Frost dates across Texas
- 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.