Frost dates in Napa County, California
The average last spring frost in Napa County falls Feb 3 to Apr 7 and the average first fall frost Nov 21 to Dec 5, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 9a to 9b. Places: American Canyon, Angwin, Deer Park, Napa, Oakville, Rutherford. Pick a ZIP for 10% and 90% odds, soil temperature and the 7-day freeze forecast.
| ZIP | Place | Last spring frost | First fall frost | Zone |
|---|---|---|---|---|
| 94503 | American Canyon | Mar 5 | Nov 21 | 9b |
| 94508 | Angwin | Apr 7 | Dec 5 | 9b |
| 94558 | Napa | Mar 6 | Nov 30 | 9b |
| 94559 | Napa | Feb 12 | Dec 4 | 9b |
| 94562 | Oakville | Feb 3 | Dec 4 | 9b |
| 94567 | Apr 7 | Dec 5 | 9a | |
| 94573 | Rutherford | Feb 3 | Dec 4 | 9b |
| 94574 | St. Helena | Apr 7 | Dec 5 | 9b |
| 94576 | Deer Park | Apr 7 | Dec 5 | 9b |
| 94599 | Yountville | Mar 2 | Nov 27 | 9b |
Nearby counties
Solano County Sonoma County Yolo County Marin County Contra Costa County Lake County
All California counties · Download California frost dates (CSV)
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