Iosco County, Michigan
Local growing conditions for Iosco County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 7 ZIP codes in our data.
Hardiness zones in Iosco County
Iosco County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Iosco County for its live forecast, frost dates, and planting calendar:
East Tawas 48730
Sand Lake 48739
Lupton 48743
Sand Lake 48748
Au Sable 48750
Sand Lake 48763
Whittemore 48770
More for Michigan
- Agriculture in Michigan
- Frost dates across Michigan
- 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.