Shelby County, Iowa
Local growing conditions for Shelby 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 Shelby County
Shelby County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Shelby County for its live forecast, frost dates, and planting calendar:
Irwin 51446
Kirkman 51447
Defiance 51527
Earling 51530
Elk Horn 51531
Harlan 51537
Panama 51562
Portsmouth 51565
Shelby 51570
Westphalia 51578
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.