California frost dates: Last spring and first autumn frost at every NOAA station, 1991-2020
Across California's 332 NOAA stations with frost dates, the median last spring frost (32°F) runs from January 1 in Bodega to December 31 in Van Nuys Airport; for half of its places it comes after February 20.
- Typical last spring frost
- February 20median of 197 places
- Typical first autumn frost
- November 28median of 197 places
- Earliest last frost
- January 1Bodega
- Latest last frost
- December 31Van Nuys Airport
When is the last frost in California, town by town?
Each date is NOAA's: "after February 20 in half of years" means the last 32°F night of spring came after February 20 in half of the years 1991-2020. By the 1-in-10 date, the last frost has passed in nine years out of ten.
Find your town in the list, or look up a ZIP code for the stations nearest it.
| Place or station | Last frost (median) | 1 in 10 after | First frost (median) | 1 in 10 before | Growing season | Zone |
|---|---|---|---|---|---|---|
| Bodega *6 mi WSW | January 1 | February 24 | December 31 | December 6 | 365 days | – |
| Death Valley National Park | January 1 | January 21 | December 19 | December 4 | 350 days | 9b |
| Monterey station * | January 1 | January 21 | December 30 | December 7 | 365 days | 10a |
| Newark * | January 1 | January 22 | December 27 | December 9 | 365 days | 10a |
| Palm Springs station * | January 1 | January 18 | December 31 | December 11 | 365 days | – |
| Burbank Valley Pump Plant | January 2 | January 31 | December 26 | December 5 | 364 days | 10a |
| Escondido *Escondido #2 | January 2 | February 4 | December 30 | December 8 | 365 days | – |
| Hayward *Hayward Air Terminal | January 2 | January 27 | December 25 | December 6 | 365 days | 10a |
| MontereyMonterey Peninsul Airport | January 2 | January 20 | December 23 | December 1 | 363 days | 10a |
| Northridge Cal State * | January 2 | January 27 | January 1 | December 9 | 365 days | – |
| San Jose station | January 2 | January 23 | December 25 | December 4 | 362 days | – |
| Berkeley * | January 3 | February 14 | January 1 | December 10 | 365 days | 10a |
| El Centro (2 mi SSW) | January 3 | February 4 | December 27 | December 9 | 363 days | 10a |
| Iron Mountain * | January 3 | February 11 | December 31 | December 6 | 365 days | – |
| Monterey Weather Office * | January 3 | January 24 | December 28 | December 5 | 365 days | – |
| Imperial | January 4 | February 7 | December 26 | December 6 | 360 days | 10a |
| Ontario *Ontario International Airport | January 4 | February 7 | December 30 | December 11 | 365 days | 10a |
| Richmond * | January 4 | January 26 | January 2 | December 11 | 365 days | – |
| San Gabriel *San Gabriel Fire Dept | January 4 | January 28 | January 2 | December 18 | 365 days | – |
| Stovepipe Wells (1 mi SW) | January 4 | January 23 | December 22 | December 6 | 352 days | 10a |
| BlytheBlythe Airport | January 5 | February 18 | December 21 | December 2 | 347 days | 9b |
| Rancho Bernardo * | January 5 | February 1 | January 2 | December 13 | 365 days | 10a |
| TustinTustin Irvine Ranch | January 5 | February 2 | December 25 | December 3 | 365 days | – |
| El Cajon | January 6 | February 7 | December 21 | December 1 | 350 days | 10a |
| El Centro Naf | January 6 | February 6 | December 21 | December 5 | 347 days | – |
| Laguna Beach * | January 6 | February 11 | January 2 | December 12 | 365 days | – |
| MeccaMecca Fire Station | January 6 | February 4 | December 22 | December 4 | 352 days | – |
| Needles *Needles Airport | January 6 | February 10 | January 2 | December 11 | 365 days | 10a |
| San Diego Brown Field * | January 6 | February 5 | December 31 | December 11 | 365 days | 10a |
| SunnyvaleMoffett Federal Airfield | January 6 | February 4 | December 23 | December 3 | 353 days | 10a |
| TurlockTurlock #2 | January 6 | January 31 | December 20 | December 3 | 351 days | 9b |
| Concord Wastewater Treatment Plant | January 7 | February 1 | December 19 | December 1 | 346 days | 10a |
| Fremont | January 7 | February 7 | December 22 | December 2 | 353 days | 10a |
| OaklandOakland Metro International Airport | January 7 | February 8 | December 23 | November 30 | 356 days | 10a |
| Ocotillo Wells (2 mi W) * | January 7 | February 7 | January 4 | December 12 | 365 days | – |
| Parker Resrvoir | January 7 | February 6 | December 31 | December 10 | 365 days | – |
| Pasadena * | January 8 | February 17 | January 7 | December 20 | 365 days | 10b |
| PomonaPomona/Fairplex | January 8 | February 18 | December 28 | December 5 | 354 days | – |
| Stevenson Ranch *Newhall (5 mi NW) | January 8 | March 10 | January 1 | November 30 | 365 days | 10a |
| ConcordConcord Buchanan Field | January 9 | February 12 | December 14 | November 28 | 343 days | 9b |
| Palm Springs *Palm Springs Asos | January 9 | January 29 | January 9 | December 23 | 365 days | 10a |
| RiversideRiverside Municipal Airport | January 9 | February 21 | December 30 | December 5 | 362 days | 10a |
| Riverside Fire Station 3 | January 9 | February 25 | December 25 | December 1 | 353 days | – |
| Torrance *Torrance Airport | January 9 | February 24 | January 5 | December 3 | 365 days | 10b |
| Borrego Desert Park * | January 10 | February 16 | January 1 | December 8 | 365 days | 10a |
| Eagle Mountain * | January 10 | February 14 | January 8 | December 26 | 365 days | 10a |
| Hemet | January 10 | February 25 | December 23 | November 27 | 350 days | 9b |
| Riverside Citrus Experiment * | January 10 | February 17 | January 2 | December 11 | 365 days | 10a |
| Pacifica *4 mi SSE | January 11 | February 12 | January 10 | December 22 | 365 days | – |
| San RafaelSan Rafael Civic Center | January 11 | February 25 | December 21 | December 2 | 349 days | 10a |
| Santa BarbaraSanta Barbara Municipal Airport | January 11 | February 13 | December 16 | December 1 | 342 days | 10a |
| AntiochAntioch Pumping Plant #3 | January 12 | February 1 | December 19 | November 29 | 343 days | 9b |
| Sacramento (5 mi ESE) | January 12 | February 8 | December 16 | November 28 | 341 days | 10a |
| San Jose | January 12 | February 14 | December 22 | December 1 | 347 days | 10a |
| Los Banos Det Resv | January 13 | February 10 | December 14 | December 1 | 338 days | 9b |
| Santa Barbara station * | January 13 | February 24 | January 6 | December 12 | 365 days | – |
| El CentroImperial County Airport | January 14 | February 15 | December 24 | December 2 | 346 days | 9b |
| FresnoFresno Yosemite Int'l | January 14 | February 11 | December 14 | November 29 | 337 days | 9b |
| Fairfield | January 15 | February 16 | December 14 | November 29 | 336 days | 9b |
| Marysville station | January 15 | February 18 | December 12 | November 24 | 333 days | – |
| Brawley2 mi SW | January 16 | February 17 | December 19 | December 2 | 335 days | 9b |
| Kentfield | January 16 | February 25 | December 18 | November 30 | 334 days | 10a |
| San Luis Obispo Poly | January 16 | February 26 | December 25 | November 25 | 349 days | 10a |
| BakersfieldBakersfield Airport | January 17 | February 18 | December 15 | November 30 | 334 days | 9b |
| ChinoChino Airport | January 17 | February 22 | December 19 | November 27 | 335 days | 9b |
| Redwood City | January 17 | February 16 | December 12 | November 24 | 333 days | 9b |
| Vallejo | January 17 | March 4 | December 27 | December 4 | 346 days | – |
| Morro Bay *Morro Bay Fire Dept | January 19 | February 9 | January 14 | December 25 | 365 days | 10a |
| Tracy Pumping Plant | January 19 | February 17 | December 10 | November 26 | 330 days | 9b |
| Lompoc | January 20 | February 24 | December 19 | November 27 | 335 days | 9b |
| Porterville | January 20 | February 22 | December 13 | November 26 | 330 days | – |
| Camp Pardee | January 22 | March 1 | December 17 | December 1 | 332 days | 9b |
| OceansideOceanside Municipal Airport | January 23 | February 22 | December 11 | November 21 | 325 days | 9b |
| Visalia | January 23 | February 27 | December 13 | November 27 | 328 days | 9b |
| Taft | January 24 | March 12 | December 17 | December 1 | 330 days | – |
| Twentynine Palms | January 24 | February 22 | December 10 | November 24 | 321 days | 9a |
| Woodland Hills Pierce College | January 24 | March 5 | December 15 | November 27 | 329 days | 9b |
| Blythe station | January 25 | February 24 | December 12 | November 28 | 325 days | – |
| Los Banos | January 26 | February 20 | December 10 | November 26 | 322 days | 9b |
| Redlands | January 27 | February 28 | December 19 | December 1 | 329 days | 10a |
| San Luis Dam | January 27 | February 22 | December 11 | November 25 | 323 days | 9b |
| Lake ElsinoreElsinore | January 28 | February 27 | December 18 | December 1 | 329 days | 9b |
| Watsonville Water Works | January 28 | March 3 | December 13 | November 25 | 324 days | 9b |
| Occidental | January 29 | March 17 | December 30 | December 1 | 347 days | – |
| OrovilleOroville Municipal Airport | January 29 | February 28 | December 7 | November 20 | 317 days | 9b |
| SalinasSalinas Municipal Airport | January 29 | March 1 | December 10 | November 21 | 325 days | 9b |
| Santa Cruz | January 29 | February 28 | December 13 | November 23 | 323 days | 9b |
| Crescent CityCrescent City McNamara Airport | January 30 | March 13 | December 25 | November 24 | 334 days | 10a |
| Fresno (5 mi NE) | January 30 | March 4 | December 11 | November 25 | 319 days | – |
| Oroville station | January 30 | March 3 | December 13 | November 21 | 321 days | – |
| Vista * | January 30 | March 16 | January 7 | December 14 | 365 days | 10a |
| Delano | January 31 | March 5 | December 8 | November 23 | 309 days | – |
| ModestoModesto City County Airport | January 31 | February 25 | December 5 | November 20 | 312 days | 9b |
| OildaleBakersfield (5 mi NW) | January 31 | February 27 | December 8 | November 23 | 312 days | – |
| San Jacinto | January 31 | February 28 | December 10 | November 22 | 315 days | 9b |
| San Luis ObispoSan Luis Obispo Airport | January 31 | March 7 | December 11 | November 20 | 319 days | 9b |
| Vacaville station | January 31 | March 11 | December 11 | November 24 | 318 days | – |
| Wasco | January 31 | February 27 | December 5 | November 21 | 315 days | 9a |
| WatsonvilleWatsonville Municipal Airport | January 31 | March 9 | December 9 | November 20 | 317 days | 9b |
| Palo Alto | February 1 | March 4 | December 7 | November 20 | 310 days | – |
| Pismo Beach | February 1 | March 13 | January 4 | December 8 | 362 days | – |
| Scotia | February 1 | March 8 | December 19 | November 19 | 328 days | 9b |
| Fallbrook *5 mi NE | February 2 | February 24 | January 30 | December 23 | 365 days | – |
| Los Gatos | February 2 | March 14 | December 6 | November 16 | 310 days | – |
| SacramentoSacramento Airport Asos | February 2 | March 5 | December 2 | November 16 | 301 days | 9b |
| San Pasqual Animal Park | February 2 | March 4 | December 7 | November 22 | 309 days | 9b |
| St. HelenaSaint Helena | February 3 | March 13 | December 4 | November 14 | 306 days | 9b |
| Lake Solano | February 4 | March 9 | December 5 | November 18 | 304 days | 9b |
| Salinas #2 | February 4 | March 11 | December 6 | November 18 | 311 days | 9b |
| Santa MariaSanta Maria Public Airport | February 4 | March 16 | December 13 | November 21 | 315 days | 9b |
| Twitchell Dam | February 4 | March 31 | December 4 | November 14 | 301 days | 9a |
| Chiriaco Summit | February 5 | March 5 | December 17 | November 25 | 313 days | – |
| Lemon Cove | February 5 | March 20 | December 8 | November 23 | 307 days | 9b |
| Stockton Fire Station 4 | February 5 | March 11 | December 8 | November 17 | 305 days | – |
| Half Moon Bay | February 6 | March 25 | December 17 | November 25 | 328 days | 10a |
| StocktonStockton Metro Airport | February 6 | February 28 | December 1 | November 15 | 304 days | 9b |
| Desert Resorts Regional Airport | February 7 | March 1 | December 2 | November 16 | 298 days | 9a |
| Hanford (1 mi S) | February 7 | March 4 | December 1 | November 16 | 296 days | 9b |
| Paradise | February 7 | April 1 | December 18 | November 26 | 313 days | 9b |
| Woodland1 mi WNW | February 7 | March 11 | December 5 | November 19 | 301 days | 9b |
| ShastaShasta Dam | February 8 | March 28 | December 28 | December 1 | 322 days | 9b |
| Buttonwillow | February 9 | March 6 | November 26 | November 10 | 289 days | 9a |
| Lodi | February 9 | March 7 | December 5 | November 17 | 301 days | – |
| DavisDavis 2 WSW Experiment Farm | February 10 | March 11 | December 1 | November 13 | 295 days | 9b |
| MarysvilleMarysville Yuba County Airport | February 11 | March 12 | November 30 | November 12 | 289 days | 9a |
| Alpine | February 12 | March 20 | December 24 | December 2 | 317 days | 10a |
| MaderaMadera Municipal Airport | February 12 | March 17 | November 30 | November 14 | 293 days | 9b |
| Napa State Hospital | February 12 | March 13 | December 4 | November 15 | 299 days | 9b |
| Big Sur Station | February 13 | April 1 | December 27 | November 23 | 323 days | 10a |
| Hearst Castle * | February 13 | March 31 | February 1 | December 16 | 365 days | – |
| Whiskeytown Reservoir | February 13 | March 25 | December 13 | November 20 | 304 days | – |
| Baker | February 14 | March 4 | November 27 | November 12 | 287 days | – |
| Coalinga | February 14 | March 8 | November 30 | November 15 | 292 days | 9b |
| Colusa2 mi SSW | February 14 | March 31 | December 1 | November 11 | 293 days | 9b |
| CorcoranCorcoran Irrig Dist | February 15 | March 10 | November 27 | November 12 | 285 days | 9b |
| Healdsburg | February 15 | March 17 | December 2 | November 14 | 292 days | 9b |
| Livermore station | February 15 | March 13 | December 2 | November 16 | 292 days | 9b |
| Trona | February 15 | March 4 | November 28 | November 11 | 285 days | 9b |
| Camp Pendleton Marine Corps Air Station | February 16 | March 18 | December 8 | November 21 | 298 days | – |
| Yucca Mesa | February 16 | March 24 | December 10 | November 23 | 296 days | – |
| Madera station | February 18 | March 18 | November 27 | November 10 | 281 days | – |
| VacavilleVacaville Nut Tree Airport | February 18 | March 25 | November 28 | November 12 | 283 days | 9b |
| Winters | February 18 | March 14 | November 30 | November 15 | 284 days | 9b |
| BarstowBarstow Daggett Airport | February 19 | March 11 | November 26 | November 10 | 279 days | 9a |
| HollisterHollister 2 | February 19 | March 28 | December 1 | November 12 | 287 days | 9b |
| Kettleman City | February 19 | March 15 | November 29 | November 14 | 281 days | – |
| Valley Center1 mi N | February 19 | March 31 | December 1 | November 11 | 281 days | – |
| Carmel Valley | February 20 | March 27 | December 8 | November 14 | 294 days | 9b |
| HanfordHanford Municipal Airport | February 20 | March 21 | November 23 | November 6 | 276 days | 9a |
| Hayfield Pumping Plant | February 20 | March 20 | November 30 | November 10 | 283 days | 9a |
| Lindsay | February 20 | March 26 | November 30 | November 15 | 284 days | 9b |
| New Melones Dam Headquarters | February 20 | April 7 | December 11 | November 24 | 290 days | 9b |
| Shafter6 mi E | February 20 | March 9 | November 23 | November 5 | 276 days | – |
| Willows6 mi W | February 21 | April 9 | December 6 | November 16 | 289 days | – |
| Barstow station | February 22 | March 24 | November 23 | November 9 | 271 days | 9a |
| EurekaEureka Weather Office Woodley Island | February 22 | March 23 | December 7 | November 15 | 293 days | 9b |
| Red BluffRed Bluff Municipal Airport | February 22 | March 30 | November 29 | November 12 | 281 days | 9a |
| Sacramento Metro Airport | February 22 | April 1 | November 24 | November 9 | 277 days | 9b |
| Balch Power House | February 23 | April 4 | December 12 | November 25 | 294 days | – |
| King City | February 23 | March 31 | November 22 | November 1 | 271 days | 9a |
| Gilroy | February 24 | April 4 | November 27 | November 10 | 277 days | – |
| LemooreLemoore Reeves Naval Air Station | February 24 | March 30 | November 22 | November 3 | 265 days | 9a |
| Auburn | February 25 | April 7 | December 5 | November 15 | 286 days | – |
| Cloverdale | February 25 | April 2 | December 3 | November 14 | 279 days | 9b |
| Morongo ValleyMorongo Valley N | February 25 | April 3 | December 15 | November 23 | 297 days | – |
| Orland | February 25 | April 6 | December 2 | November 17 | 279 days | 9b |
| Santa Rosa station | February 25 | March 29 | December 1 | November 10 | 279 days | 9b |
| TracyTracy Carbona | February 25 | April 6 | November 26 | November 8 | 272 days | – |
| WoodsideWoodside Fire Station 1 | February 25 | April 11 | November 25 | November 3 | 274 days | – |
| Fort Ross | February 26 | May 1 | December 27 | December 1 | 310 days | – |
| MercedMerced Municipal Airport | February 26 | April 1 | November 25 | November 9 | 273 days | 9a |
| Newman | February 26 | April 21 | November 29 | November 12 | 273 days | 9a |
| Five Points (5 mi SSW) | February 27 | April 13 | November 26 | November 8 | 271 days | – |
| LivermoreLivermore Municipal Airport | February 27 | March 29 | December 1 | November 14 | 278 days | 9b |
| Hesperia2 mi E | February 28 | April 3 | December 1 | November 11 | 270 days | – |
| Joshua Tree | February 28 | March 28 | December 1 | November 12 | 273 days | – |
| MartinezMartinez Water Treatment Plant | February 28 | April 5 | November 22 | November 7 | 266 days | 9b |
| PetalumaPetaluma Airport | February 28 | April 6 | November 25 | November 9 | 271 days | 9b |
| Johnson Valley | March 1 | March 29 | November 29 | November 11 | 271 days | – |
| Calistoga | March 2 | April 18 | November 23 | November 1 | 263 days | 9a |
| Fort Bragg5 mi N | March 2 | April 6 | December 1 | November 9 | 272 days | 9b |
| San Gregorio (2 mi SE) | March 2 | April 15 | November 25 | November 1 | 268 days | – |
| Santa RosaSanta Rosa Sonoma County Airport | March 2 | April 2 | November 20 | November 1 | 262 days | 9a |
| Sonoma | March 2 | April 5 | November 27 | November 6 | 270 days | 9b |
| Merced station | March 3 | April 10 | November 24 | November 5 | 263 days | – |
| ReddingRedding Airport | March 3 | April 9 | November 21 | November 7 | 261 days | 9a |
| ChicoChico University Farm | March 4 | April 2 | November 17 | November 1 | 257 days | – |
| Grizzly Creek State Park | March 4 | April 8 | November 22 | November 1 | 264 days | – |
| Ramona Fire Dept | March 4 | April 10 | December 4 | November 17 | 270 days | – |
| Sutter Hill Fire Station | March 4 | April 8 | December 11 | November 19 | 285 days | – |
| NapaNapa County Airport | March 5 | April 16 | November 21 | November 3 | 256 days | 9a |
| UkiahUkiah Municipal Airport | March 5 | April 7 | November 21 | November 2 | 259 days | 9a |
| Markley Cove | March 6 | April 6 | November 30 | November 12 | 266 days | 9b |
| Mitchell Caverns | March 6 | April 9 | December 8 | November 12 | 272 days | 9a |
| ArcataArcata Eureka Airport | March 8 | April 15 | November 30 | November 1 | 262 days | 9b |
| Mount Diablo Junction | March 8 | April 15 | December 22 | November 23 | 282 days | 9b |
| FriantFriant Government Camp | March 9 | April 16 | December 1 | November 12 | 262 days | 9b |
| Inyokern | March 9 | April 8 | November 20 | November 2 | 250 days | – |
| Palmdale station | March 10 | April 11 | November 19 | November 3 | 248 days | – |
| Richardson Grove State Park | March 10 | April 13 | December 1 | November 7 | 271 days | – |
| China Lake Naf | March 11 | April 9 | November 12 | October 29 | 244 days | – |
| Crescent City (3 mi NNW) | March 11 | April 12 | November 23 | November 1 | 256 days | 9b |
| Ash Mountain | March 12 | April 16 | December 9 | November 17 | 273 days | 9b |
| Orleans | March 12 | April 9 | November 26 | October 31 | 262 days | 9a |
| Pearblossom | March 13 | April 17 | December 1 | November 12 | 258 days | 9a |
| Yucca Valley | March 14 | April 1 | November 28 | November 10 | 255 days | – |
| Mojave | March 15 | April 17 | November 17 | October 31 | 241 days | – |
| Paso Robles station | March 15 | April 13 | November 10 | October 23 | 238 days | 9a |
| Klamath | March 16 | April 20 | November 20 | October 30 | 252 days | – |
| Three RiversThree Rivers Edison Powerhouse 1 | March 16 | April 14 | November 26 | November 5 | 249 days | – |
| PalmdalePalmdale Airport | March 18 | April 11 | November 15 | October 30 | 241 days | 8b |
| Victorville | March 18 | April 12 | November 11 | October 27 | 233 days | 8b |
| El Capitan Dam | March 19 | June 1 | December 8 | October 25 | 270 days | – |
| RamonaRamona Airport | March 19 | April 10 | November 23 | November 6 | 248 days | 9a |
| Randsburg | March 19 | April 13 | November 25 | November 5 | 251 days | 9a |
| Redding (12 mi WNW) | March 19 | April 11 | November 22 | November 4 | 250 days | – |
| Ukiah station | March 19 | April 15 | November 20 | November 2 | 245 days | 9a |
| Gibraltar Dam #2 | March 20 | April 16 | November 27 | November 4 | 250 days | – |
| Graton | March 20 | April 19 | November 13 | October 26 | 240 days | 9a |
| El Mirage | March 21 | April 22 | November 12 | October 28 | 235 days | – |
| Ojai | March 21 | April 15 | November 15 | October 28 | 235 days | 9a |
| Skyline Ridge Preserve | March 21 | April 28 | December 15 | November 21 | 275 days | – |
| Auberry2 mi NW | March 25 | April 22 | December 3 | November 14 | 253 days | 9b |
| Ben LomondBen Lomond #4 | March 25 | April 21 | November 11 | October 18 | 231 days | 9a |
| JulianJulian Fire Station | March 27 | April 30 | December 1 | November 3 | 248 days | – |
| Merced (23 mi WSW) | March 28 | April 27 | November 14 | October 27 | 233 days | 9a |
| Independence | March 31 | April 23 | November 9 | October 27 | 224 days | 8b |
| Placerville | March 31 | April 23 | November 21 | November 1 | 237 days | – |
| Dobbins1 mi S | April 1 | April 22 | November 17 | October 31 | 229 days | – |
| Colfax | April 3 | April 29 | November 24 | November 2 | 233 days | 9a |
| Lancaster | April 3 | April 23 | November 1 | October 17 | 211 days | 8a |
| Paso RoblesPaso Robles Municipal Airport | April 4 | April 27 | November 5 | October 17 | 213 days | 9a |
| South Lake FS | April 5 | April 21 | November 3 | October 18 | 212 days | – |
| Stony Gorge Reservoir | April 5 | April 24 | November 13 | October 29 | 220 days | 9a |
| East Park Reservoir | April 6 | April 25 | November 10 | October 27 | 219 days | – |
| Fairmont | April 6 | May 20 | November 29 | November 5 | 236 days | 9a |
| AngwinAngwin Pacific Union College | April 7 | April 30 | December 5 | November 14 | 245 days | 9b |
| Kern River Powerhouse 3 | April 7 | April 28 | November 11 | October 30 | 217 days | – |
| Potter ValleyPotter Valley Powerhouse | April 8 | April 29 | November 6 | October 20 | 211 days | 9a |
| Sonora | April 9 | April 30 | November 9 | October 19 | 213 days | – |
| Clearlake4 mi SE | April 10 | April 30 | November 6 | October 24 | 209 days | – |
| Grass ValleyGrass Valley #2 | April 10 | April 30 | November 13 | October 26 | 215 days | 9a |
| Cachuma Lake | April 11 | May 6 | November 8 | October 14 | 209 days | 9b |
| GeorgetownGeorgetown Ranger Station | April 12 | May 10 | November 21 | October 29 | 221 days | – |
| OrickOrick Prairie Creek Park | April 12 | May 5 | November 6 | October 15 | 209 days | – |
| Nevada City | April 14 | May 7 | November 20 | October 23 | 218 days | 9a |
| Paicines (4 mi W) | April 14 | May 9 | November 2 | October 16 | 201 days | – |
| New CuyamaNew Cuyama Fire Station | April 15 | May 3 | November 4 | October 18 | 201 days | 8b |
| Sandberg | April 15 | May 9 | November 26 | November 1 | 224 days | 9a |
| Big Bar (4 mi E) | April 16 | May 3 | October 31 | October 13 | 197 days | 9a |
| Hetch Hetchy | April 16 | May 12 | November 12 | October 24 | 208 days | 8b |
| De Sabla | April 17 | May 11 | November 11 | October 21 | 206 days | 9a |
| Haiwee | April 17 | May 8 | November 1 | October 15 | 196 days | 8a |
| Henshaw Dam | April 18 | May 14 | October 26 | October 9 | 189 days | 8b |
| Cuyamaca | April 19 | May 14 | October 27 | October 9 | 190 days | 8b |
| Yosemite Park Headquarters | April 21 | May 13 | October 27 | October 12 | 186 days | – |
| GrovelandGroveland 2 | April 22 | May 14 | November 2 | October 13 | 192 days | 8b |
| Loraine (5 mi NNE) | April 22 | May 14 | November 13 | October 22 | 201 days | – |
| Mount LagunaMount Laguna #3 | April 22 | May 21 | November 8 | October 10 | 197 days | – |
| Covelo | April 23 | May 11 | October 19 | October 2 | 179 days | 8b |
| DunsmuirDunsmuir Trtmt Plant | April 23 | May 12 | October 27 | October 9 | 185 days | 8b |
| Pinnacles National Monument | April 23 | June 4 | November 3 | October 7 | 189 days | – |
| Trinity River Hatchery | April 23 | May 11 | October 22 | October 4 | 178 days | 8b |
| North Fork Ranger Station | April 24 | May 14 | November 4 | October 14 | 192 days | – |
| Pacific House | April 26 | May 19 | November 2 | October 14 | 191 days | – |
| Cecilville | April 27 | May 17 | October 21 | October 7 | 176 days | – |
| Downieville | April 28 | May 22 | October 25 | October 9 | 178 days | 8b |
| Mount Wilson CBS | April 28 | May 27 | November 15 | October 18 | 199 days | 8b |
| Tehachapi4 mi SE | April 28 | May 21 | October 26 | October 4 | 183 days | – |
| BishopBishop Airport | April 29 | May 27 | October 15 | September 30 | 166 days | 7b |
| CampoCampo Asos | April 29 | June 1 | November 1 | October 5 | 184 days | 8b |
| Palomar Mountain Obsy | April 29 | May 29 | November 18 | October 27 | 201 days | 8b |
| Campo station | April 30 | June 1 | October 26 | September 30 | 174 days | – |
| Yreka | April 30 | May 20 | October 18 | October 3 | 169 days | 8a |
| Cherry Valley Dam | May 2 | May 29 | November 4 | October 15 | 183 days | 8a |
| Mount Hamilton | May 3 | June 5 | November 18 | October 22 | 197 days | 9a |
| Weaverville | May 3 | May 27 | October 11 | September 28 | 159 days | 8b |
| Blue Canyon Airport | May 4 | May 31 | November 4 | October 12 | 183 days | 8b |
| Copco #1 Dam | May 4 | May 31 | October 21 | October 10 | 168 days | – |
| Strawberry Valley | May 4 | May 31 | October 30 | October 7 | 174 days | 8b |
| Lake Arrowhead | May 5 | May 31 | November 2 | October 12 | 176 days | – |
| Willits1 mi NE | May 5 | May 31 | October 9 | September 24 | 157 days | 8b |
| Mount Shasta | May 6 | May 28 | October 12 | September 27 | 158 days | 7b |
| Calaveras Big Trees | May 7 | May 31 | October 28 | October 5 | 169 days | 8a |
| Priest Valley | May 8 | May 29 | October 22 | October 1 | 165 days | 8b |
| Verdi2 mi W | May 9 | June 2 | October 17 | October 1 | 156 days | – |
| Glennville | May 11 | June 6 | October 17 | September 30 | 155 days | 8a |
| Bowman Dam | May 12 | June 2 | October 29 | October 10 | 167 days | – |
| MontagueMontague Siskiyou County Airport | May 12 | June 1 | October 8 | September 24 | 148 days | 7b |
| Yosemite Village (12 mi W) | May 12 | June 4 | November 1 | October 5 | 171 days | – |
| Cedarville | May 15 | June 6 | October 1 | September 16 | 137 days | 7a |
| Mount Shasta station | May 15 | June 5 | October 6 | September 20 | 143 days | – |
| Idyllwild Fire Dept | May 16 | June 5 | October 24 | October 1 | 160 days | 8a |
| Susanville2 mi SW | May 16 | June 5 | October 8 | September 25 | 143 days | – |
| Wrightwood | May 16 | June 9 | October 13 | September 25 | 151 days | – |
| Canyon Dam | May 18 | June 9 | October 8 | September 24 | 143 days | 7b |
| Callahan | May 20 | June 12 | October 5 | September 20 | 135 days | 7b |
| Doyle4 mi SSE | May 21 | June 11 | October 1 | September 9 | 130 days | 7a |
| Lake Spaulding | May 22 | June 8 | October 16 | September 26 | 147 days | – |
| Quincy | May 22 | June 14 | September 25 | September 4 | 122 days | 7b |
| Lee Vining | May 23 | June 9 | October 9 | September 27 | 139 days | 7b |
| So Entrance Yosemite National Park | May 24 | June 11 | October 10 | September 24 | 137 days | 8a |
| Fort Bidwell | May 26 | June 13 | October 1 | September 12 | 127 days | 6b |
| Big Bear Lake | May 27 | June 9 | October 4 | September 21 | 131 days | 7b |
| AdinAdin Ranger Station | May 28 | June 16 | September 29 | September 10 | 125 days | – |
| Chester | May 28 | June 13 | September 28 | September 12 | 124 days | 7a |
| McCloud | May 28 | June 15 | September 30 | September 12 | 123 days | – |
| Hat Creek | May 29 | June 23 | September 19 | September 5 | 113 days | 7b |
| Canby3 mi SW | June 1 | June 20 | September 16 | September 1 | 106 days | – |
| Grant Grove | June 1 | June 15 | October 7 | September 19 | 132 days | – |
| Huntington Lake | June 1 | June 18 | October 6 | September 19 | 129 days | – |
| AlturasAlturas Municipal Airport | June 3 | June 24 | September 12 | August 27 | 97 days | 6a |
| Alturas station | June 3 | June 26 | September 13 | August 27 | 97 days | – |
| Burney | June 3 | June 19 | September 14 | September 1 | 102 days | – |
| Tahoma | June 4 | June 20 | October 3 | September 17 | 120 days | – |
| Lava Beds Nat Mon | June 6 | June 22 | September 28 | September 8 | 113 days | – |
| Tulelake | June 6 | June 23 | September 14 | August 30 | 97 days | 6b |
| Lodgepole | June 8 | June 29 | September 20 | August 31 | 100 days | 6b |
| Manzanita Lake | June 9 | June 27 | September 21 | September 1 | 102 days | – |
| Tahoe City | June 9 | June 25 | September 25 | September 9 | 108 days | 7a |
| Mammoth LakesMammoth Lakes Ranger Station | June 10 | June 30 | September 17 | September 2 | 98 days | – |
| Mineral | June 10 | June 28 | September 13 | August 22 | 96 days | – |
| Portola | June 11 | July 2 | September 10 | August 22 | 91 days | 6b |
| Jess Valley | June 14 | July 3 | September 18 | August 31 | 94 days | – |
| Point Mugu NF * | December 29 | January 15 | December 24 | December 6 | 365 days | 10a |
| San Francisco International Airport * | December 29 | January 13 | December 26 | December 11 | 365 days | 10b |
| San Francisco Oceanside * | December 30 | March 13 | December 25 | November 26 | 365 days | – |
| Burbank *Burbank Glendale Pasadena Airport | December 31 | January 15 | December 28 | December 11 | 365 days | 10a |
| Camarillo *Camarillo Airport | December 31 | February 2 | December 28 | December 7 | 365 days | 10a |
| Indio *Indio Fire Station | December 31 | January 21 | December 27 | December 8 | 365 days | – |
| Santa Barbara (11 mi W) * | December 31 | January 29 | December 20 | December 1 | 365 days | – |
| Van Nuys Airport * | December 31 | January 27 | December 30 | December 9 | 365 days | 10a |
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities, growing-season length); station daily lows via ACIS (zone). * A night at 32°F or colder comes there in fewer than half of years; NOAA's dates for it are shown as published. Growing season: NOAA's median number of days between the last spring and first autumn 32°F night. Zone: the USDA's plant hardiness rule applied to the station's own 1991-2020 coldest nights.