Stephenson County, Illinois
Local growing conditions for Stephenson County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 14 ZIP codes in our data.
Hardiness zones in Stephenson County
Stephenson County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Stephenson County for its live forecast, frost dates, and planting calendar:
Cedarville 61013
Dakota 61018
Lake Summerset 61019
Lena 61027
Freeport 61032
German Valley 61039
Stockton 61044
Lena 61048
Orangeville 61050
Orangeville 61060
Pearl City 61062
Ridott 61067
Rock City 61070
Winslow 61089
More for Illinois
- Agriculture in Illinois
- Frost dates across Illinois
- 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.