Fremont County, Idaho
Local growing conditions for Fremont County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 6 ZIP codes in our data.
Hardiness zones in Fremont County
Fremont County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Fremont County for its live forecast, frost dates, and planting calendar:
Warm River 83420
St. Anthony 83421
Island Park 83429
Island Park 83433
Parker 83438
St. Anthony 83445
More for Idaho
- Agriculture in Idaho
- Frost dates across Idaho
- 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.