Frost dates in Contra Costa County, California
The average last spring frost in Contra Costa County falls Jan 3 to Mar 8 and the average first fall frost Nov 22 to Jan 2 (next year), depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 10a to 9b. Places: Alamo, Antioch, Berkeley, Bethel Island, Blackhawk, Brentwood. 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 |
|---|---|---|---|---|
| 94505 | Discovery Bay | Jan 19 | Dec 10 | 9b |
| 94506 | Blackhawk | Mar 8 | Dec 22 | 9b |
| 94507 | Alamo | Mar 8 | Dec 22 | 9b |
| 94509 | Antioch | Jan 12 | Dec 19 | 9b |
| 94511 | Bethel Island | Jan 12 | Dec 19 | 9b |
| 94513 | Brentwood | Jan 12 | Dec 19 | 9b |
| 94514 | Byron | Jan 19 | Dec 10 | 9b |
| 94516 | Jan 3 | Jan 1 (next year) | 9b | |
| 94517 | Clayton | Mar 8 | Dec 22 | 9b |
| 94518 | Concord | Jan 9 | Dec 14 | 9b |
| 94519 | Concord | Jan 9 | Dec 14 | 9b |
| 94520 | Concord | Jan 9 | Dec 14 | 9b |
| 94521 | Concord | Jan 9 | Dec 14 | 9b |
| 94523 | Pleasant Hill | Jan 7 | Dec 19 | 9b |
| 94525 | Crockett | Feb 28 | Nov 22 | 9b |
| 94526 | Danville | Mar 8 | Dec 22 | 9b |
| 94528 | Diablo | Mar 8 | Dec 22 | 9b |
| 94530 | El Cerrito | Jan 3 | Jan 1 (next year) | 10a |
| 94531 | Antioch | Jan 12 | Dec 19 | 9b |
| 94547 | Hercules | Feb 28 | Nov 22 | 9b |
| 94548 | Knightsen | Jan 12 | Dec 19 | 9b |
| 94549 | Lafayette | Jan 7 | Dec 19 | 9b |
| 94553 | Martinez | Feb 28 | Nov 22 | 9b |
| 94556 | Moraga | Jan 3 | Jan 1 (next year) | 9b |
| 94561 | Oakley | Jan 12 | Dec 19 | 9b |
| 94563 | Orinda | Jan 3 | Jan 1 (next year) | 9b |
| 94564 | Pinole | Jan 4 | Jan 2 (next year) | 9b |
| 94565 | Pittsburg | Jan 9 | Dec 14 | 9b |
| 94569 | Port Costa | Feb 28 | Nov 22 | 9b |
| 94572 | Rodeo | Feb 28 | Nov 22 | 9b |
| 94575 | Moraga | Jan 3 | Jan 1 (next year) | 9b |
| 94582 | San Ramon | Feb 15 | Dec 2 | 9b |
| 94583 | San Ramon | Mar 8 | Dec 22 | 9b |
| 94595 | Walnut Creek | Mar 8 | Dec 22 | 9b |
| 94596 | Walnut Creek | Mar 8 | Dec 22 | 9b |
| 94597 | Walnut Creek | Jan 7 | Dec 19 | 9b |
| 94598 | Walnut Creek | Mar 8 | Dec 22 | 9b |
| 94708 | Berkeley | Jan 3 | Jan 1 (next year) | 10a |
| 94801 | Richmond | Jan 4 | Jan 2 (next year) | 10a |
| 94803 | Richmond | Jan 4 | Jan 2 (next year) | 10a |
| 94804 | Richmond | Jan 4 | Jan 2 (next year) | 10a |
| 94805 | Richmond | Jan 4 | Jan 2 (next year) | 10a |
| 94806 | Richmond | Jan 4 | Jan 2 (next year) | 10a |
Nearby counties
Alameda County Solano County San Francisco County San Mateo County Marin County Napa County
All California counties · Download California frost dates (CSV)
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