Piatt County, Illinois
Local growing conditions for Piatt County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 11 ZIP codes in our data.
Hardiness zones in Piatt County
Piatt County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Piatt County for its live forecast, frost dates, and planting calendar:
Bement 61813
Cerro Gordo 61818
Cisco 61830
De Land 61839
Mansfield 61854
Cerro Gordo 61855
Monticello 61856
White Heath 61884
Atwood 61913
Hammond 61929
LaPlace 61936
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.