Jefferson County, Illinois
Local growing conditions for Jefferson County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 12 ZIP codes in our data.
Hardiness zones in Jefferson County
Jefferson County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Jefferson County for its live forecast, frost dates, and planting calendar:
Belle Rive 62810
Bluford 62814
Bonnie 62816
Dix 62830
Ina 62846
Mount Vernon 62864
Opdyke 62872
Waltonville 62883
Kell 62889
Walnut Hill 62893
Waltonville 62894
Woodlawn 62898
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.