Ontonagon County, Michigan
Local growing conditions for Ontonagon County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 8 ZIP codes in our data.
Hardiness zones in Ontonagon County
Ontonagon County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Ontonagon County for its live forecast, frost dates, and planting calendar:
Bergland 49910
Bruce Crossing 49912
Ewen 49925
Greenland 49929
Mass City 49948
Ontonagon 49953
Rockland 49960
White Pine 49971
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.