McHenry County, Illinois
Local growing conditions for McHenry County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 18 ZIP codes in our data.
Hardiness zones in McHenry County
McHenry County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in McHenry County for its live forecast, frost dates, and planting calendar:
Crystal Lake 60012
Cary 60013
Crystal Lake 60014
Fox River Grove 60021
Harvard 60033
Hebron 60034
McHenry 60050
Lakemoor 60051
Richmond 60071
Ringwood 60072
Spring Grove 60081
Wonder Lake 60097
Woodstock 60098
Algonquin 60102
Huntley 60142
Marengo 60152
Lake in the Hills 60156
Union 60180
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.