When to plant Summer squash (zucchini) in California

In spring, from Feb 1 – Apr 15 in Agoura Hills to June 10 – 20 in Truckee.

In fall, from May 15 – July 1 in Truckee to June 1 – Sept 1 in Yucca Valley.

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

Summer squash planting dates by place in California
PlaceSpringFall
AdelantoApr 1 – May 15June 1 – Aug 10
Agoura HillsFeb 1 – Apr 15June 1 – Sept 15
Alameda—June 1 – Oct 1
Albany—June 1 – Oct 1
Alhambra—June 1 – Oct 1
Aliso Viejo—June 1 – Oct 1
American CanyonMar 15 – May 15June 1 – Aug 20
Anaheim—June 1 – Oct 1
AndersonMar 15 – May 15June 1 – Aug 20
Antioch—June 1 – Oct 1
Apple ValleyApr 1 – May 15June 1 – Aug 10
Arcadia—June 1 – Oct 1
ArcataMar 1 – Apr 15June 1 – Sept 15
Arroyo GrandeFeb 1 – Apr 15June 1 – Oct 1
Artesia—June 1 – Oct 1
ArvinFeb 1 – Apr 15June 1 – Sept 15
AtascaderoMar 15 – May 1June 1 – Aug 10
AtwaterMar 15 – May 15June 1 – Aug 20
AuburnMar 15 – May 15June 1 – Sept 1
AvenalMar 1 – Apr 15June 1 – Sept 1
Azusa—June 1 – Oct 1
BakersfieldFeb 1 – Apr 15June 1 – Sept 15
Baldwin Park—June 1 – Oct 1
BanningFeb 1 – Apr 15June 1 – Sept 15
BarstowMar 1 – Apr 15June 1 – Aug 20
BeaumontFeb 1 – Apr 15June 1 – Sept 15
Bell——
Bell Gardens——
Bellflower——
BelmontFeb 1 – Apr 15June 1 – Sept 15
BeniciaFeb 1 – Apr 15June 1 – Oct 1
Berkeley—June 1 – Oct 1
Beverly Hills——
BlytheFeb 1 – Apr 15June 1 – Sept 15
BrawleyFeb 1 – Apr 15June 1 – Oct 1
Brea—June 1 – Oct 1
Brentwood—June 1 – Oct 1
Buena Park——
Burbank—June 1 – Oct 1
Burlingame—June 1 – Oct 1
CalabasasFeb 1 – Apr 15June 1 – Sept 15
Calexico—June 1 – Oct 1
California CityMar 15 – May 1June 1 – Aug 20
CalimesaFeb 1 – Apr 15June 1 – Oct 1
Camarillo—June 1 – Oct 1
CampbellFeb 1 – Apr 15June 1 – Sept 15
Canyon LakeFeb 1 – Apr 15June 1 – Oct 1
CarlsbadFeb 1 – Apr 15June 1 – Sept 15
Carpinteria——
Carson——
Cathedral City——
CeresFeb 1 – Apr 15June 1 – Sept 1
Cerritos—June 1 – Oct 1
ChicoMar 15 – May 15June 1 – Aug 20
ChinoFeb 1 – Apr 15June 1 – Oct 1
Chino HillsFeb 1 – Apr 15June 1 – Oct 1
ChowchillaFeb 15 – Apr 15June 1 – Sept 1
Chula Vista—June 1 – Oct 1
Citrus Heights—June 1 – Oct 1
Claremont—June 1 – Oct 1
ClaytonMar 15 – May 1June 1 – Oct 1
ClearlakeApr 20 – June 1June 1 – Aug 10
Clovis—June 1 – Sept 15
Coachella—June 1 – Oct 1
CoalingaMar 1 – Apr 15June 1 – Sept 1
Colton—June 1 – Oct 1
Commerce——
Compton——
Concord—June 1 – Sept 15
CorcoranMar 1 – Apr 15June 1 – Sept 1
CoronaFeb 1 – Apr 15June 1 – Oct 1
Coronado——
Corte MaderaFeb 1 – Apr 15June 1 – Oct 1
Costa Mesa——
Covina—June 1 – Oct 1
Cudahy——
Culver City——
Cupertino—June 1 – Oct 1
Cypress——
Daly City—June 1 – Oct 1
Dana Point—June 1 – Oct 1
DanvilleMar 15 – May 1June 1 – Oct 1
DavisFeb 15 – Apr 15June 1 – Sept 1
DelanoFeb 1 – Apr 15June 1 – Sept 15
Desert Hot SpringsMar 15 – May 15June 1 – Sept 15
Diamond Bar—June 1 – Oct 1
DinubaFeb 1 – Apr 15June 1 – Sept 15
DixonFeb 15 – Apr 15June 1 – Sept 1
Downey——
DuarteMay 1 – 30June 1 – Aug 10
DublinMar 1 – Apr 15June 1 – Sept 1
East Palo AltoFeb 1 – Apr 15June 1 – Sept 15
EastvaleFeb 1 – Apr 15June 1 – Oct 1
El Cajon—June 1 – Oct 1
El Centro—June 1 – Oct 1
El Cerrito—June 1 – Oct 1
El Monte—June 1 – Oct 1
El Paso de Robles (Paso Robles)Mar 15 – May 1June 1 – Aug 10
El Segundo——
Elk GroveFeb 1 – Apr 15June 1 – Sept 1
Emeryville—June 1 – Oct 1
Encinitas—June 1 – Oct 1
Escondido—June 1 – Oct 1
EurekaMar 1 – Apr 15June 1 – Sept 15
ExeterMar 1 – Apr 15June 1 – Sept 1
FairfieldFeb 1 – Apr 15June 1 – Sept 15
FarmersvilleFeb 1 – Apr 15June 1 – Sept 15
Fillmore—June 1 – Oct 1
Folsom—June 1 – Oct 1
Fontana—June 1 – Oct 1
FortunaFeb 1 – Apr 15June 1 – Oct 1
Foster CityFeb 1 – Apr 15June 1 – Sept 15
Fountain Valley——
Fremont—June 1 – Oct 1
Fresno—June 1 – Sept 15
Fullerton——
GaltFeb 15 – Apr 15June 1 – Sept 1
Garden Grove——
Gardena——
GilroyMar 15 – May 15June 1 – Sept 1
Glendale—June 1 – Oct 1
Glendora—June 1 – Oct 1
Goleta—June 1 – Oct 1
Grand Terrace—June 1 – Oct 1
Grass ValleyApr 20 – June 1June 1 – Aug 10
GreenfieldMar 1 – Apr 15June 1 – Aug 20
Grover BeachFeb 1 – Apr 15June 1 – Oct 1
Half Moon BayFeb 15 – Apr 15June 1 – Oct 1
HanfordFeb 15 – Apr 15June 1 – Sept 1
Hawaiian Gardens——
Hawthorne——
Hayward—June 1 – Oct 1
HealdsburgMar 1 – Apr 15June 1 – Sept 1
HemetFeb 1 – Apr 15June 1 – Sept 15
HerculesFeb 1 – Apr 15June 1 – Oct 1
Hermosa Beach——
HesperiaMar 15 – May 15June 1 – Sept 1
HighlandFeb 1 – Apr 15June 1 – Oct 1
Hillsborough—June 1 – Oct 1
HollisterMar 1 – Apr 15June 1 – Sept 1
Huntington Beach——
Huntington Park——
Imperial—June 1 – Oct 1
Imperial Beach—June 1 – Oct 1
Indio—June 1 – Oct 1
Inglewood——
Irvine—June 1 – Oct 1
Jurupa Valley—June 1 – Oct 1
KermanMar 1 – Apr 15June 1 – Sept 1
King CityMar 1 – Apr 15June 1 – Aug 20
KingsburgMar 1 – Apr 15June 1 – Aug 20
La Cañada Flintridge——
La Habra—June 1 – Oct 1
La Mesa—June 1 – Oct 1
La Mirada—June 1 – Oct 1
La Palma——
La Puente—June 1 – Oct 1
La Quinta—June 1 – Oct 1
La Verne—June 1 – Oct 1
Lafayette—June 1 – Oct 1
Laguna Beach—June 1 – Oct 1
Laguna Hills—June 1 – Oct 1
Laguna Niguel—June 1 – Oct 1
Laguna Woods—June 1 – Oct 1
Lake ElsinoreFeb 1 – Apr 15June 1 – Oct 1
Lake Forest—June 1 – Oct 1
Lakewood——
LancasterApr 10 – June 1June 1 – Aug 1
LarkspurFeb 1 – Apr 15June 1 – Oct 1
LathropFeb 15 – Apr 15June 1 – Sept 1
Lawndale——
Lemon Grove—June 1 – Oct 1
LemooreMar 15 – May 15June 1 – Aug 20
LincolnMar 15 – May 15June 1 – Sept 1
LindsayMar 1 – Apr 15June 1 – Sept 1
LivermoreMar 1 – Apr 15June 1 – Sept 1
Livingston—June 1 – Oct 1
LodiFeb 15 – Apr 15June 1 – Sept 1
Loma LindaFeb 1 – Apr 15June 1 – Oct 1
Lomita——
LompocFeb 1 – Apr 15June 1 – Oct 1
Long Beach——
Los Alamitos——
Los Altos—June 1 – Oct 1
Los Angeles——
Los BanosFeb 1 – Apr 15June 1 – Sept 15
Los GatosFeb 1 – Apr 15June 1 – Sept 15
Lynwood——
MaderaFeb 15 – Apr 15June 1 – Sept 1
Malibu——
Manhattan Beach——
MantecaFeb 15 – Apr 15June 1 – Sept 1
MarinaFeb 15 – Apr 15June 1 – Sept 15
MartinezMar 15 – May 15June 1 – Aug 20
MarysvilleFeb 1 – Apr 15June 1 – Sept 15
Maywood——
McFarlandFeb 1 – Apr 15June 1 – Sept 15
MendotaFeb 15 – Apr 15June 1 – Sept 1
MenifeeFeb 1 – Apr 15June 1 – Oct 1
Menlo ParkFeb 1 – Apr 15June 1 – Sept 15
MercedMar 15 – May 15June 1 – Aug 20
Mill ValleyFeb 1 – Apr 15June 1 – Oct 1
Millbrae—June 1 – Oct 1
Milpitas—June 1 – Oct 1
Mission Viejo—June 1 – Oct 1
ModestoFeb 1 – Apr 15June 1 – Sept 1
MonroviaMay 1 – 30June 1 – Aug 10
Montclair—June 1 – Oct 1
Montebello—June 1 – Oct 1
Monterey—June 1 – Oct 1
Monterey Park—June 1 – Oct 1
Moorpark—June 1 – Oct 1
Moraga—June 1 – Oct 1
Moreno ValleyFeb 1 – Apr 15June 1 – Oct 1
Morgan HillMar 15 – May 15June 1 – Sept 1
Morro BayFeb 1 – Apr 15—
Mountain View—June 1 – Oct 1
MurrietaFeb 1 – Apr 15—
NapaFeb 15 – Apr 15June 1 – Sept 1
National City——
Newark—June 1 – Oct 1
NewmanMar 15 – May 15June 1 – Sept 1
Newport Beach——
NorcoFeb 1 – Apr 15June 1 – Oct 1
Norwalk—June 1 – Oct 1
Novato—June 1 – Oct 1
OakdaleFeb 1 – Apr 15June 1 – Sept 1
Oakland—June 1 – Oct 1
Oakley—June 1 – Oct 1
OceansideFeb 1 – Apr 15June 1 – Sept 15
Ontario—June 1 – Oct 1
Orange——
Orinda—June 1 – Oct 1
OrovilleFeb 1 – Apr 15June 1 – Sept 15
Oxnard—June 1 – Oct 1
Pacific Grove—June 1 – Oct 1
Pacifica——
Palm Desert—June 1 – Oct 1
Palm Springs—June 1 – Oct 1
PalmdaleMar 15 – May 1June 1 – Aug 20
Palo AltoFeb 1 – Apr 15June 1 – Sept 15
Palos Verdes Estates——
Paramount——
ParlierFeb 1 – Apr 15June 1 – Sept 15
Pasadena——
PattersonFeb 1 – Apr 15June 1 – Sept 1
PerrisFeb 1 – Apr 15June 1 – Oct 1
PetalumaMar 15 – May 15June 1 – Aug 20
Pico Rivera—June 1 – Oct 1
Piedmont—June 1 – Oct 1
Pinole—June 1 – Oct 1
Pittsburg—June 1 – Oct 1
Placentia—June 1 – Oct 1
PlacervilleApr 10 – June 1June 1 – Aug 20
Pleasant Hill—June 1 – Oct 1
PleasantonMar 1 – Apr 15June 1 – Sept 1
Pomona—June 1 – Oct 1
Port Hueneme—June 1 – Oct 1
PortervilleFeb 1 – Apr 15June 1 – Sept 15
Poway—June 1 – Oct 1
Rancho Cordova—June 1 – Oct 1
Rancho Cucamonga—June 1 – Oct 1
Rancho Mirage——
Rancho Palos Verdes——
Rancho Santa Margarita—June 1 – Oct 1
Red BluffMar 1 – Apr 15June 1 – Sept 1
ReddingMar 15 – May 15June 1 – Aug 20
RedlandsFeb 1 – Apr 15June 1 – Oct 1
Redondo Beach——
Redwood CityFeb 1 – Apr 15June 1 – Sept 15
ReedleyFeb 1 – Apr 15June 1 – Sept 15
Rialto—June 1 – Oct 1
Richmond—June 1 – Oct 1
RidgecrestMar 15 – May 1June 1 – Aug 10
Rio Vista—June 1 – Oct 1
RiponFeb 15 – Apr 15June 1 – Sept 1
RiverbankFeb 1 – Apr 15June 1 – Sept 1
Riverside—June 1 – Oct 1
RocklinMar 15 – May 15June 1 – Sept 1
Rohnert ParkMar 15 – May 15June 1 – Sept 1
Rosemead—June 1 – Oct 1
RosevilleMar 1 – Apr 15June 1 – Aug 20
Sacramento—June 1 – Oct 1
SalinasFeb 1 – Apr 15June 1 – Sept 15
San Anselmo—June 1 – Oct 1
San BernardinoFeb 1 – Apr 15June 1 – Oct 1
San Bruno——
San Buenaventura (Ventura)—June 1 – Oct 1
San CarlosFeb 1 – Apr 15June 1 – Sept 15
San Clemente—June 1 – Oct 1
San Diego——
San Dimas—June 1 – Oct 1
San Fernando—June 1 – Oct 1
San Francisco—June 1 – Oct 1
San Gabriel—June 1 – Oct 1
San JacintoFeb 1 – Apr 15June 1 – Sept 15
San Jose—June 1 – Oct 1
San Juan Capistrano—June 1 – Oct 1
San Leandro—June 1 – Oct 1
San Luis ObispoFeb 1 – Apr 15June 1 – Sept 15
San Marcos—June 1 – Oct 1
San Marino——
San Mateo—June 1 – Oct 1
San Pablo—June 1 – Oct 1
San Rafael—June 1 – Oct 1
San RamonMar 15 – May 1June 1 – Oct 1
SangerFeb 1 – Apr 15June 1 – Sept 15
Santa Ana——
Santa Barbara——
Santa Clara—June 1 – Oct 1
Santa Clarita—June 1 – Oct 1
Santa CruzFeb 1 – Apr 15June 1 – Sept 15
Santa Fe Springs—June 1 – Oct 1
Santa MariaFeb 15 – Apr 15June 1 – Sept 15
Santa Monica——
Santa Paula—June 1 – Oct 1
Santa RosaMar 15 – May 15June 1 – Sept 1
Santee—June 1 – Oct 1
SaratogaFeb 1 – Apr 15June 1 – Sept 15
Scotts ValleyApr 1 – May 15June 1 – Aug 10
Seal Beach——
Seaside—June 1 – Oct 1
SelmaFeb 1 – Apr 15June 1 – Sept 15
ShafterMar 1 – Apr 15June 1 – Aug 20
Shasta LakeFeb 15 – Apr 15June 1 – Oct 1
Sierra MadreMay 1 – 30June 1 – Aug 10
Signal Hill——
Simi ValleyFeb 1 – Apr 15June 1 – Sept 15
Solana Beach—June 1 – Oct 1
SoledadMay 1 – June 15June 1 – Aug 1
SonomaMar 15 – May 15June 1 – Sept 1
South El Monte—June 1 – Oct 1
South Gate——
South Lake TahoeJune 10 – 20June 1 – July 1
South Pasadena——
South San Francisco—June 1 – Oct 1
Stanton——
StocktonFeb 15 – Apr 15June 1 – Sept 15
Suisun CityFeb 1 – Apr 15June 1 – Sept 15
Sunnyvale—June 1 – Oct 1
SusanvilleMay 20 – June 15June 1 – July 15
TehachapiMay 1 – 30June 1 – Aug 1
TemeculaFeb 1 – Apr 15—
Temple City—June 1 – Oct 1
Thousand Oaks—June 1 – Oct 1
Torrance——
TracyMar 15 – May 15June 1 – Sept 1
TruckeeJune 10 – 20May 15 – July 1
TulareFeb 1 – Apr 15June 1 – Sept 15
Turlock—June 1 – Oct 1
Tustin—June 1 – Oct 1
Twentynine PalmsFeb 1 – Apr 15June 1 – Sept 15
UkiahApr 1 – May 15June 1 – Aug 20
Union City—June 1 – Oct 1
Upland—June 1 – Oct 1
VacavilleMar 1 – Apr 15June 1 – Sept 1
VallejoFeb 1 – Apr 15June 1 – Oct 1
VictorvilleApr 1 – May 15June 1 – Aug 10
VisaliaFeb 1 – Apr 15June 1 – Sept 15
VistaFeb 1 – Apr 15—
Walnut—June 1 – Oct 1
Walnut Creek—June 1 – Oct 1
WascoFeb 1 – Apr 15June 1 – Sept 1
WatsonvilleFeb 1 – Apr 15June 1 – Sept 15
West Covina—June 1 – Oct 1
West Hollywood——
West SacramentoFeb 1 – Apr 15June 1 – Sept 1
Westminster——
Whittier—June 1 – Oct 1
WildomarFeb 1 – Apr 15June 1 – Oct 1
WindsorMar 15 – May 15June 1 – Aug 20
WoodlandFeb 15 – Apr 15June 1 – Sept 1
Yorba LindaFeb 1 – Apr 15June 1 – Oct 1
Yuba CityFeb 1 – Apr 15June 1 – Sept 15
YucaipaFeb 1 – Apr 15June 1 – Oct 1
Yucca ValleyMar 15 – May 1June 1 – Sept 1

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 summer squash.