Ottawa County, Ohio
Local growing conditions for Ottawa County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 15 ZIP codes in our data.
Hardiness zones in Ottawa County
Ottawa County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Ottawa County for its live forecast, frost dates, and planting calendar:
Clay Center 43408
Elmore 43416
Genoa 43430
Rocky Ridge 43432
Port Clinton 43433
Put-in-Bay 43436
Port Clinton 43439
Lakeside 43440
Clay Center 43445
Put-in-Bay 43446
Oak Harbor 43449
Port Clinton 43452
Put-in-Bay 43456
Rocky Ridge 43458
Williston 43468
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.