California frost dates: W
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Wallace | Jan 22 | Dec 17 | 329 d | 9b |
| Walnut | Jan 8 | Dec 28 | 354 d | 10a |
| Walnut Creek | Jan 7 | Dec 19 | 346 d | 9b |
| Walnut Grove | Feb 9 | Dec 5 | 299 d | 9b |
| Warner Springs | Apr 18 | Oct 26 | 191 d | 8b |
| Wasco | Jan 31 | Dec 5 | 308 d | 9a |
| Washington | May 4 | Nov 4 | 184 d | 8b |
| Waterford | Jan 6 | Dec 20 | 348 d | 9b |
| Watsonville | Jan 28 | Dec 13 | 319 d | 9b |
| Waukena | Feb 15 | Nov 27 | 285 d | 9a |
| Weaverville | May 3 | Oct 11 | 161 d | 8b |
| Weed | May 6 | Oct 12 | 159 d | 8a |
| Weimar | Apr 3 | Nov 24 | 235 d | 9a |
| Weldon | Apr 5 | Nov 3 | 212 d | 9a |
| Wendel | May 16 | Oct 8 | 145 d | 7a |
| Weott | Mar 4 | Nov 22 | 263 d | 9b |
| West Covina | Jan 8 | Dec 28 | 354 d | 10a |
| West Hills | Jan 24 | Dec 15 | 325 d | 10a |
| West Hollywood | rare frost | 10b | ||
| West Point | May 7 | Oct 28 | 174 d | 9a |
| West Sacramento | Feb 2 | Dec 2 | 303 d | 9b |
| Westlake Village | Jan 24 | Dec 15 | 325 d | 10a |
| Westley | Feb 25 | Nov 26 | 274 d | 9b |
| Westminster | rare frost | 10a | ||
| Westmorland | Jan 16 | Dec 19 | 337 d | 9b |
| Westport | Mar 2 | Dec 1 | 274 d | 9b |
| Westwood | May 18 | Oct 8 | 143 d | 7a |
| Wheatland | Feb 11 | Nov 30 | 292 d | 9b |
| Whiskeytown | Feb 13 | Dec 13 | 303 d | 9b |
| Whitethorn | rare frost | 9b | ||
| Whitewater | Feb 25 | Dec 15 | 293 d | 9b |
| Whitmore | Jun 9 | Sep 21 | 104 d | 9a |
| Whittier | rare frost | 10b | ||
| Wildomar | Jan 28 | Dec 18 | 324 d | 9b |
| Williams | Feb 14 | Dec 1 | 290 d | 9b |
| Willits | May 5 | Oct 9 | 157 d | 9a |
| Willow Creek | Mar 8 | Nov 30 | 267 d | 9a |
| Willows | Feb 21 | Dec 6 | 288 d | 9b |
| Wilmington | Jan 9 | Jan 5 | 361 d | 10b |
| Wilseyville | May 7 | Oct 28 | 174 d | 8b |
| Wilton | Jan 12 | Dec 16 | 338 d | 9b |
| Winchester | Jan 31 | Dec 10 | 313 d | 9b |
| Windsor | Mar 2 | Nov 20 | 263 d | 9a |
| Winnetka | Jan 24 | Dec 15 | 325 d | 10a |
| Winterhaven | Jan 8 | Dec 28 | 354 d | 10a |
| Winters | Feb 18 | Nov 30 | 285 d | 9b |
| Winton | Mar 3 | Nov 24 | 266 d | 9b |
| Wishon | Apr 24 | Nov 4 | 194 d | 9a |
| Witter Springs | Mar 5 | Nov 21 | 261 d | 8b |
| Wofford Heights | Apr 7 | Nov 11 | 218 d | 8b |
| Woodacre | Jan 11 | Dec 21 | 344 d | 10a |
| Woodbridge | Feb 9 | Dec 5 | 299 d | 9b |
| Woodlake | Feb 5 | Dec 8 | 306 d | 9b |
| Woodland | Feb 7 | Dec 5 | 301 d | 9b |
| Woodland Hills | Jan 24 | Dec 15 | 325 d | 10a |
| Woody | May 11 | Oct 17 | 159 d | 9b |
| Wrightwood | May 16 | Oct 13 | 150 d | 7b |