Polk County, Iowa
Local growing conditions for Polk County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 33 ZIP codes in our data.
Hardiness zones in Polk County
Polk County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Polk County for its live forecast, frost dates, and planting calendar:
Des Moines 50321
Alleman 50007
Altoona 50009
Ankeny 50021
Ankeny 50023
Des Moines 50032
Bondurant 50035
Elkhart 50073
Granger 50109
Grimes 50111
Johnston 50131
Maxwell 50161
Mitchellville 50169
Polk City 50226
Runnells 50237
Sheldahl 50243
Slater 50244
West Des Moines 50265
Des Moines 50309
Des Moines 50310
Des Moines 50311
Des Moines 50312
Saylorville 50313
Des Moines 50314
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.