Rock County, Wisconsin
Local growing conditions for Rock County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 13 ZIP codes in our data.
Hardiness zones in Rock County
Rock County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Rock County for its live forecast, frost dates, and planting calendar:
Janesville 53501
Lake Lorraine 53505
Beloit 53511
Brodhead 53520
Clinton 53525
Edgerton 53534
Evansville 53536
Footville 53537
Janesville 53545
Janesville 53546
Janesville 53548
Milton 53563
Orfordville 53576
More for Wisconsin
- Agriculture in Wisconsin
- Frost dates across Wisconsin
- 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.