When to plant Winter squash in California

In fall, from May 20 – June 10 in Truckee to Aug 1 – Sept 1 in Yucaipa.

USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.

Winter squash planting dates by place in California
PlaceSpringFall
Adelanto—June 20 – July 20
Agoura Hills—Aug 1 – Sept 1
Alameda—Aug 1 – Sept 1
Albany—Aug 1 – Sept 1
Alhambra—Aug 1 – Sept 1
Aliso Viejo—Aug 1 – Sept 1
American Canyon—July 1 – Aug 1
Anaheim—Aug 1 – Sept 1
Anderson—July 1 – Aug 1
Antioch—Aug 1 – Sept 1
Apple Valley—June 20 – July 20
Arcadia—Aug 1 – Sept 1
Arcata—Aug 1 – Sept 1
Arroyo Grande—Aug 1 – Sept 1
Artesia—Aug 1 – Sept 1
Arvin—Aug 1 – Sept 1
Atascadero—June 20 – July 20
Atwater—July 1 – Aug 1
Auburn—July 15 – Aug 15
Avenal—July 15 – Aug 15
Azusa—Aug 1 – Sept 1
Bakersfield—Aug 1 – Sept 1
Baldwin Park—Aug 1 – Sept 1
Banning—Aug 1 – Sept 1
Barstow—July 1 – Aug 1
Beaumont—Aug 1 – Sept 1
Bell——
Bell Gardens——
Bellflower——
Belmont—Aug 1 – Sept 1
Benicia—Aug 1 – Sept 1
Berkeley—Aug 1 – Sept 1
Beverly Hills——
Blythe—Aug 1 – Sept 1
Brawley—Aug 1 – Sept 1
Brea—Aug 1 – Sept 1
Brentwood—Aug 1 – Sept 1
Buena Park——
Burbank—Aug 1 – Sept 1
Burlingame—Aug 1 – Sept 1
Calabasas—Aug 1 – Sept 1
Calexico—Aug 1 – Sept 1
California City—July 1 – Aug 1
Calimesa—Aug 1 – Sept 1
Camarillo—Aug 1 – Sept 1
Campbell—Aug 1 – Sept 1
Canyon Lake—Aug 1 – Sept 1
Carlsbad—Aug 1 – Sept 1
Carpinteria——
Carson——
Cathedral City——
Ceres—July 15 – Aug 15
Cerritos—Aug 1 – Sept 1
Chico—July 1 – Aug 1
Chino—Aug 1 – Sept 1
Chino Hills—Aug 1 – Sept 1
Chowchilla—July 15 – Aug 15
Chula Vista—Aug 1 – Sept 1
Citrus Heights—Aug 1 – Sept 1
Claremont—Aug 1 – Sept 1
Clayton—Aug 1 – Sept 1
Clearlake—June 20 – July 20
Clovis—Aug 1 – Sept 1
Coachella—Aug 1 – Sept 1
Coalinga—July 15 – Aug 15
Colton—Aug 1 – Sept 1
Commerce——
Compton——
Concord—Aug 1 – Sept 1
Corcoran—July 15 – Aug 15
Corona—Aug 1 – Sept 1
Coronado——
Corte Madera—Aug 1 – Sept 1
Costa Mesa——
Covina—Aug 1 – Sept 1
Cudahy——
Culver City——
Cupertino—Aug 1 – Sept 1
Cypress——
Daly City—Aug 1 – Sept 1
Dana Point—Aug 1 – Sept 1
Danville—Aug 1 – Sept 1
Davis—July 15 – Aug 15
Delano—Aug 1 – Sept 1
Desert Hot Springs—Aug 1 – Sept 1
Diamond Bar—Aug 1 – Sept 1
Dinuba—Aug 1 – Sept 1
Dixon—July 15 – Aug 15
Downey——
Duarte—June 20 – July 20
Dublin—July 15 – Aug 15
East Palo Alto—Aug 1 – Sept 1
Eastvale—Aug 1 – Sept 1
El Cajon—Aug 1 – Sept 1
El Centro—Aug 1 – Sept 1
El Cerrito—Aug 1 – Sept 1
El Monte—Aug 1 – Sept 1
El Paso de Robles (Paso Robles)—June 20 – July 20
El Segundo——
Elk Grove—July 15 – Aug 15
Emeryville—Aug 1 – Sept 1
Encinitas—Aug 1 – Sept 1
Escondido—Aug 1 – Sept 1
Eureka—Aug 1 – Sept 1
Exeter—July 15 – Aug 15
Fairfield—Aug 1 – Sept 1
Farmersville—Aug 1 – Sept 1
Fillmore—Aug 1 – Sept 1
Folsom—Aug 1 – Sept 1
Fontana—Aug 1 – Sept 1
Fortuna—Aug 1 – Sept 1
Foster City—Aug 1 – Sept 1
Fountain Valley——
Fremont—Aug 1 – Sept 1
Fresno—Aug 1 – Sept 1
Fullerton——
Galt—July 15 – Aug 15
Garden Grove——
Gardena——
Gilroy—July 15 – Aug 15
Glendale—Aug 1 – Sept 1
Glendora—Aug 1 – Sept 1
Goleta—Aug 1 – Sept 1
Grand Terrace—Aug 1 – Sept 1
Grass Valley—June 20 – July 20
Greenfield—July 1 – Aug 1
Grover Beach—Aug 1 – Sept 1
Half Moon Bay—Aug 1 – Sept 1
Hanford—July 15 – Aug 15
Hawaiian Gardens——
Hawthorne——
Hayward—Aug 1 – Sept 1
Healdsburg—July 15 – Aug 15
Hemet—Aug 1 – Sept 1
Hercules—Aug 1 – Sept 1
Hermosa Beach——
Hesperia—July 15 – Aug 15
Highland—Aug 1 – Sept 1
Hillsborough—Aug 1 – Sept 1
Hollister—July 15 – Aug 15
Huntington Beach——
Huntington Park——
Imperial—Aug 1 – Sept 1
Imperial Beach—Aug 1 – Sept 1
Indio—Aug 1 – Sept 1
Inglewood——
Irvine—Aug 1 – Sept 1
Jurupa Valley—Aug 1 – Sept 1
Kerman—July 15 – Aug 15
King City—July 1 – Aug 1
Kingsburg—July 1 – Aug 1
La Cañada Flintridge——
La Habra—Aug 1 – Sept 1
La Mesa—Aug 1 – Sept 1
La Mirada—Aug 1 – Sept 1
La Palma——
La Puente—Aug 1 – Sept 1
La Quinta—Aug 1 – Sept 1
La Verne—Aug 1 – Sept 1
Lafayette—Aug 1 – Sept 1
Laguna Beach—Aug 1 – Sept 1
Laguna Hills—Aug 1 – Sept 1
Laguna Niguel—Aug 1 – Sept 1
Laguna Woods—Aug 1 – Sept 1
Lake Elsinore—Aug 1 – Sept 1
Lake Forest—Aug 1 – Sept 1
Lakewood——
Lancaster—June 10 – July 10
Larkspur—Aug 1 – Sept 1
Lathrop—July 15 – Aug 15
Lawndale——
Lemon Grove—Aug 1 – Sept 1
Lemoore—July 1 – Aug 1
Lincoln—July 15 – Aug 15
Lindsay—July 15 – Aug 15
Livermore—July 15 – Aug 15
Livingston—Aug 1 – Sept 1
Lodi—July 15 – Aug 15
Loma Linda—Aug 1 – Sept 1
Lomita——
Lompoc—Aug 1 – Sept 1
Long Beach——
Los Alamitos——
Los Altos—Aug 1 – Sept 1
Los Angeles——
Los Banos—Aug 1 – Sept 1
Los Gatos—Aug 1 – Sept 1
Lynwood——
Madera—July 15 – Aug 15
Malibu——
Manhattan Beach——
Manteca—July 15 – Aug 15
Marina—Aug 1 – Sept 1
Martinez—July 1 – Aug 1
Marysville—Aug 1 – Sept 1
Maywood——
McFarland—Aug 1 – Sept 1
Mendota—July 15 – Aug 15
Menifee—Aug 1 – Sept 1
Menlo Park—Aug 1 – Sept 1
Merced—July 1 – Aug 1
Mill Valley—Aug 1 – Sept 1
Millbrae—Aug 1 – Sept 1
Milpitas—Aug 1 – Sept 1
Mission Viejo—Aug 1 – Sept 1
Modesto—July 15 – Aug 15
Monrovia—June 20 – July 20
Montclair—Aug 1 – Sept 1
Montebello—Aug 1 – Sept 1
Monterey—Aug 1 – Sept 1
Monterey Park—Aug 1 – Sept 1
Moorpark—Aug 1 – Sept 1
Moraga—Aug 1 – Sept 1
Moreno Valley—Aug 1 – Sept 1
Morgan Hill—July 15 – Aug 15
Morro Bay——
Mountain View—Aug 1 – Sept 1
Murrieta——
Napa—July 15 – Aug 15
National City——
Newark—Aug 1 – Sept 1
Newman—July 15 – Aug 15
Newport Beach——
Norco—Aug 1 – Sept 1
Norwalk—Aug 1 – Sept 1
Novato—Aug 1 – Sept 1
Oakdale—July 15 – Aug 15
Oakland—Aug 1 – Sept 1
Oakley—Aug 1 – Sept 1
Oceanside—Aug 1 – Sept 1
Ontario—Aug 1 – Sept 1
Orange——
Orinda—Aug 1 – Sept 1
Oroville—Aug 1 – Sept 1
Oxnard—Aug 1 – Sept 1
Pacific Grove—Aug 1 – Sept 1
Pacifica——
Palm Desert—Aug 1 – Sept 1
Palm Springs—Aug 1 – Sept 1
Palmdale—July 1 – Aug 1
Palo Alto—Aug 1 – Sept 1
Palos Verdes Estates——
Paramount——
Parlier—Aug 1 – Sept 1
Pasadena——
Patterson—July 15 – Aug 15
Perris—Aug 1 – Sept 1
Petaluma—July 1 – Aug 1
Pico Rivera—Aug 1 – Sept 1
Piedmont—Aug 1 – Sept 1
Pinole—Aug 1 – Sept 1
Pittsburg—Aug 1 – Sept 1
Placentia—Aug 1 – Sept 1
Placerville—July 1 – Aug 1
Pleasant Hill—Aug 1 – Sept 1
Pleasanton—July 15 – Aug 15
Pomona—Aug 1 – Sept 1
Port Hueneme—Aug 1 – Sept 1
Porterville—Aug 1 – Sept 1
Poway—Aug 1 – Sept 1
Rancho Cordova—Aug 1 – Sept 1
Rancho Cucamonga—Aug 1 – Sept 1
Rancho Mirage——
Rancho Palos Verdes——
Rancho Santa Margarita—Aug 1 – Sept 1
Red Bluff—July 15 – Aug 15
Redding—July 1 – Aug 1
Redlands—Aug 1 – Sept 1
Redondo Beach——
Redwood City—Aug 1 – Sept 1
Reedley—Aug 1 – Sept 1
Rialto—Aug 1 – Sept 1
Richmond—Aug 1 – Sept 1
Ridgecrest—June 20 – July 20
Rio Vista—Aug 1 – Sept 1
Ripon—July 15 – Aug 15
Riverbank—July 15 – Aug 15
Riverside—Aug 1 – Sept 1
Rocklin—July 15 – Aug 15
Rohnert Park—July 15 – Aug 15
Rosemead—Aug 1 – Sept 1
Roseville—July 1 – Aug 1
Sacramento—Aug 1 – Sept 1
Salinas—Aug 1 – Sept 1
San Anselmo—Aug 1 – Sept 1
San Bernardino—Aug 1 – Sept 1
San Bruno——
San Buenaventura (Ventura)—Aug 1 – Sept 1
San Carlos—Aug 1 – Sept 1
San Clemente—Aug 1 – Sept 1
San Diego——
San Dimas—Aug 1 – Sept 1
San Fernando—Aug 1 – Sept 1
San Francisco—Aug 1 – Sept 1
San Gabriel—Aug 1 – Sept 1
San Jacinto—Aug 1 – Sept 1
San Jose—Aug 1 – Sept 1
San Juan Capistrano—Aug 1 – Sept 1
San Leandro—Aug 1 – Sept 1
San Luis Obispo—Aug 1 – Sept 1
San Marcos—Aug 1 – Sept 1
San Marino——
San Mateo—Aug 1 – Sept 1
San Pablo—Aug 1 – Sept 1
San Rafael—Aug 1 – Sept 1
San Ramon—Aug 1 – Sept 1
Sanger—Aug 1 – Sept 1
Santa Ana——
Santa Barbara——
Santa Clara—Aug 1 – Sept 1
Santa Clarita—Aug 1 – Sept 1
Santa Cruz—Aug 1 – Sept 1
Santa Fe Springs—Aug 1 – Sept 1
Santa Maria—Aug 1 – Sept 1
Santa Monica——
Santa Paula—Aug 1 – Sept 1
Santa Rosa—July 15 – Aug 15
Santee—Aug 1 – Sept 1
Saratoga—Aug 1 – Sept 1
Scotts Valley—June 20 – July 20
Seal Beach——
Seaside—Aug 1 – Sept 1
Selma—Aug 1 – Sept 1
Shafter—July 1 – Aug 1
Shasta Lake—Aug 1 – Sept 1
Sierra Madre—June 20 – July 20
Signal Hill——
Simi Valley—Aug 1 – Sept 1
Solana Beach—Aug 1 – Sept 1
Soledad—June 10 – July 10
Sonoma—July 15 – Aug 15
South El Monte—Aug 1 – Sept 1
South Gate——
South Lake Tahoe—June 1 – 15
South Pasadena——
South San Francisco—Aug 1 – Sept 1
Stanton——
Stockton—Aug 1 – Sept 1
Suisun City—Aug 1 – Sept 1
Sunnyvale—Aug 1 – Sept 1
Susanville—June 1 – July 1
Tehachapi—June 10 – July 10
Temecula——
Temple City—Aug 1 – Sept 1
Thousand Oaks—Aug 1 – Sept 1
Torrance——
Tracy—July 15 – Aug 15
Truckee—May 20 – June 10
Tulare—Aug 1 – Sept 1
Turlock—Aug 1 – Sept 1
Tustin—Aug 1 – Sept 1
Twentynine Palms—Aug 1 – Sept 1
Ukiah—July 1 – Aug 1
Union City—Aug 1 – Sept 1
Upland—Aug 1 – Sept 1
Vacaville—July 15 – Aug 15
Vallejo—Aug 1 – Sept 1
Victorville—June 20 – July 20
Visalia—Aug 1 – Sept 1
Vista——
Walnut—Aug 1 – Sept 1
Walnut Creek—Aug 1 – Sept 1
Wasco—July 15 – Aug 15
Watsonville—Aug 1 – Sept 1
West Covina—Aug 1 – Sept 1
West Hollywood——
West Sacramento—July 15 – Aug 15
Westminster——
Whittier—Aug 1 – Sept 1
Wildomar—Aug 1 – Sept 1
Windsor—July 1 – Aug 1
Woodland—July 15 – Aug 15
Yorba Linda—Aug 1 – Sept 1
Yuba City—Aug 1 – Sept 1
Yucaipa—Aug 1 – Sept 1
Yucca Valley—July 15 – Aug 15

Planting dates: USDA Home and Garden Bulletin No. 9 (1967), tables 4 and 5. Frost dates: NOAA U.S. Climate Normals 1991–2020. “—” means the place's frost date is outside the table. The full USDA table for winter squash.