Frost dates in San Mateo County, California
The average last spring frost in San Mateo County falls Dec 29 (prior Dec) to Mar 21 and the average first fall frost Nov 25 to Jan 10 (next year), depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 10a to 9b. Places: Atherton, Belmont, Brisbane, Daly City, El Granada, Foster City. 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 |
|---|---|---|---|---|
| 94002 | Belmont | Jan 17 | Dec 12 | 10a |
| 94005 | Brisbane | Dec 29 (prior Dec) | Dec 26 | 10a |
| 94010 | Hillsborough | Dec 29 (prior Dec) | Dec 26 | 10a |
| 94014 | Daly City | Dec 30 (prior Dec) | Dec 25 | 10a |
| 94015 | Daly City | Dec 30 (prior Dec) | Dec 25 | 10a |
| 94018 | El Granada | Feb 6 | Dec 17 | 10a |
| 94019 | Half Moon Bay | Feb 6 | Dec 17 | 10a |
| 94020 | La Honda | Mar 21 | Dec 15 | 9b |
| 94021 | Loma Mar | Mar 21 | Dec 15 | 9b |
| 94025 | Menlo Park | Feb 1 | Dec 7 | 9b |
| 94027 | Atherton | Jan 17 | Dec 12 | 9b |
| 94028 | Portola Valley | Feb 25 | Nov 25 | 9b |
| 94030 | Millbrae | Dec 29 (prior Dec) | Dec 26 | 10a |
| 94037 | Montara | Jan 11 | Jan 10 (next year) | 10a |
| 94038 | Moss Beach | Jan 11 | Jan 10 (next year) | 10a |
| 94044 | Pacifica | Jan 11 | Jan 10 (next year) | 10a |
| 94060 | Pescadero | Mar 2 | Nov 25 | 9b |
| 94061 | Redwood City | Jan 17 | Dec 12 | 10a |
| 94062 | Woodside | Feb 25 | Nov 25 | 10a |
| 94063 | Redwood City | Jan 17 | Dec 12 | 10a |
| 94065 | Redwood City | Jan 17 | Dec 12 | 10a |
| 94066 | San Bruno | Jan 11 | Jan 10 (next year) | 10a |
| 94070 | San Carlos | Jan 17 | Dec 12 | 10a |
| 94074 | Mar 2 | Nov 25 | 9b | |
| 94080 | South San Francisco | Dec 29 (prior Dec) | Dec 26 | 10a |
| 94128 | South San Francisco | Dec 29 (prior Dec) | Dec 26 | 10a |
| 94401 | San Mateo | Dec 29 (prior Dec) | Dec 26 | 10a |
| 94402 | San Mateo | Dec 29 (prior Dec) | Dec 26 | 10a |
| 94403 | San Mateo | Jan 17 | Dec 12 | 10a |
| 94404 | Foster City | Jan 17 | Dec 12 | 10a |
Nearby counties
San Francisco County Alameda County Santa Clara County Contra Costa County Santa Cruz County Marin County
All California counties · Download California frost dates (CSV)
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