Calhoun County, Iowa
Local growing conditions for Calhoun County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 10 ZIP codes in our data.
Hardiness zones in Calhoun County
Calhoun County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Calhoun County for its live forecast, frost dates, and planting calendar:
Rockwell City 50579
Farnhamville 50538
Jolley 50551
Knierim 50552
Lytton 50561
Manson 50563
Pomeroy 50575
Somers 50586
Lake City 51449
Lohrville 51453
More for Iowa
- Agriculture in Iowa
- Frost dates across Iowa
- 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.