Jersey County, Illinois
Local growing conditions for Jersey County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 8 ZIP codes in our data.
Hardiness zones in Jersey County
Jersey County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Jersey County for its live forecast, frost dates, and planting calendar:
Brighton 62012
Godfrey 62022
Elsah 62028
Fidelity 62030
Fieldon 62031
Grafton 62037
Jerseyville 62052
Medora 62063
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.