Monroe County, Illinois
Local growing conditions for Monroe 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 Monroe County
Monroe County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Monroe County for its live forecast, frost dates, and planting calendar:
Columbia 62236
Fults 62244
Hecker 62248
Maeystown 62256
Red Bud 62278
Prairie du Rocher 62279
Valmeyer 62295
Waterloo 62298
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.