Knox County, Illinois
Local growing conditions for Knox County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 17 ZIP codes in our data.
Hardiness zones in Knox County
Knox County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Knox County for its live forecast, frost dates, and planting calendar:
Galesburg 61401
Altona 61414
Galesburg 61402
Abingdon 61410
Oak Run 61428
East Galesburg 61430
Gilson 61436
Henderson 61439
Knoxville 61448
Maquon 61458
Oneida 61467
Rio 61472
St. Augustine 61474
Victoria 61485
Henderson 61488
Williamsfield 61489
Yates City 61572
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.