Warren County, Illinois
Local growing conditions for Warren 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 Warren County
Warren County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Warren County for its live forecast, frost dates, and planting calendar:
Roseville 61417
Cameron 61423
Alexis 61435
Kirkwood 61447
Little York 61453
Monmouth 61462
Roseville 61473
Media 61478
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.