DeKalb County, Illinois
Local growing conditions for DeKalb 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 DeKalb County
DeKalb County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in DeKalb County for its live forecast, frost dates, and planting calendar:
DeKalb 60111
Cortland 60112
DeKalb 60115
Genoa 60135
Kingston 60145
Kirkland 60146
Malta 60150
Sycamore 60178
Hinckley 60520
Sandwich 60548
Shabbona 60550
Somonauk 60552
Waterman 60556
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.