Mercer County, Ohio
Local growing conditions for Mercer 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 Mercer County
Mercer County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Mercer County for its live forecast, frost dates, and planting calendar:
Burkettsville 45310
Celina 45822
Chickasaw 45826
Coldwater 45828
Fort Recovery 45846
Maria Stein 45860
Mendon 45862
Montezuma 45866
Rockford 45882
St. Henry 45883
More for Ohio
- Agriculture in Ohio
- Frost dates across Ohio
- 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.