Napa County, California
Local growing conditions for Napa 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 Napa County
Napa County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Napa County for its live forecast, frost dates, and planting calendar:
American Canyon 94503
Angwin 94508
Moskowite Corner 94558
Napa 94559
Oakville 94562
Angwin 94567
Rutherford 94573
Deer Park 94574
Deer Park 94576
Yountville 94599
More for California
- Agriculture in California
- Frost dates across California
- 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.