Humboldt County, Iowa
Local growing conditions for Humboldt 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 Humboldt County
Humboldt County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Humboldt County for its live forecast, frost dates, and planting calendar:
Dakota City 50529
Humboldt 50548
St. Joseph 50519
Bradgate 50520
Hardy 50545
Livermore 50558
Ottosen 50570
Renwick 50577
Rutland 50582
Thor 50591
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.