When to Plant Zucchini in California
California spans USDA hardiness 5b to 11a (zones 5b to 11a on this page). Plant zucchini by your local frost date, not the calendar — pick your zone below for exact start-indoors, transplant, and harvest dates.
Jump to: Zone 5b · Zone 6a · Zone 6b · Zone 7a · Zone 7b · Zone 8a · Zone 8b · Zone 9a · Zone 9b · Zone 10a · Zone 10b · Zone 11a
Zucchini planting calendar for California, Zone 5b
Average last spring frost
April 30
Average first fall frost
October 5
Start seeds indoors
Apr 9
Transplant outdoors
May 14
Projected first harvest
Jul 8
Most zucchini mature in about 50 to 55 days depending on the variety. Full zone 5 guide (both 5a and 5b) →
Zucchini planting calendar for California, Zone 6a
Average last spring frost
April 25
Average first fall frost
October 10
Start seeds indoors
Apr 4
Transplant outdoors
May 9
Projected first harvest
Jul 3
Most zucchini mature in about 50 to 55 days depending on the variety. Full zone 6 guide (both 6a and 6b) →
Zucchini planting calendar for California, Zone 6b
Average last spring frost
April 20
Average first fall frost
October 15
Start seeds indoors
Mar 30
Transplant outdoors
May 4
Projected first harvest
Jun 28
Most zucchini mature in about 50 to 55 days depending on the variety. Full zone 6 guide (both 6a and 6b) →
Zucchini planting calendar for California, Zone 7a
Average last spring frost
April 15
Average first fall frost
October 20
Start seeds indoors
Mar 25
Transplant outdoors
Apr 29
Projected first harvest
Jun 23
Most zucchini mature in about 50 to 55 days depending on the variety. Full zone 7 guide (both 7a and 7b) →
Zucchini planting calendar for California, Zone 7b
Average last spring frost
April 10
Average first fall frost
October 30
Start seeds indoors
Mar 20
Transplant outdoors
Apr 24
Projected first harvest
Jun 18
Most zucchini mature in about 50 to 55 days depending on the variety. Full zone 7 guide (both 7a and 7b) →
Zucchini planting calendar for California, Zone 8a
Average last spring frost
April 1
Average first fall frost
November 10
Start seeds indoors
Mar 11
Transplant outdoors
Apr 15
Projected first harvest
Jun 9
Most zucchini mature in about 50 to 55 days depending on the variety. Full zone 8 guide (both 8a and 8b) →
Zucchini planting calendar for California, Zone 8b
Average last spring frost
March 20
Average first fall frost
November 20
Start seeds indoors
Feb 27
Transplant outdoors
Apr 3
Projected first harvest
May 28
Most zucchini mature in about 50 to 55 days depending on the variety. Full zone 8 guide (both 8a and 8b) →
Zucchini planting calendar for California, Zone 9a
Average last spring frost
March 1
Average first fall frost
December 1
Start seeds indoors
Feb 8
Transplant outdoors
Mar 15
Projected first harvest
May 9
Most zucchini mature in about 50 to 55 days depending on the variety. Full zone 9 guide (both 9a and 9b) →
Zucchini planting calendar for California, Zone 9b
Average last spring frost
February 15
Average first fall frost
December 15
Start seeds indoors
Jan 25
Transplant outdoors
Mar 1
Projected first harvest
Apr 25
Most zucchini mature in about 50 to 55 days depending on the variety. Full zone 9 guide (both 9a and 9b) →
Zucchini planting calendar for California, Zone 10a
Average last spring frost
January 30
Average first fall frost
December 30
Start seeds indoors
Jan 9
Transplant outdoors
Feb 13
Projected first harvest
Apr 9
Most zucchini mature in about 50 to 55 days depending on the variety. Full zone 10 guide (both 10a and 10b) →
Zucchini planting calendar for California, Zone 10b
Average last spring frost
January 30
Average first fall frost
December 30
Start seeds indoors
Jan 9
Transplant outdoors
Feb 13
Projected first harvest
Apr 9
Most zucchini mature in about 50 to 55 days depending on the variety. Full zone 10 guide (both 10a and 10b) →
Zucchini planting calendar for California, Zone 11a
Zone 11a doesn't get a seasonal frost — zucchini plants on a warm/cool-season calendar instead of frost dates.
Best planting window
Year-round
Time to harvest
~55 days
🌴 Your zone never frosts, so planting is timed to the cooler vs. warmer seasons rather than a frost date.
Most zucchini mature in about 50 to 55 days depending on the variety.
Not sure which half-zone you're in? Set your ZIP in HomeSown for dates tuned to your exact location.
Varieties to grow
2 varieties of zucchini in the HomeSown library. Tap any for its full grow guide.
Common problems with zucchini
What to watch for, with identification and treatment for each
🌱 Grow zucchini with a calendar built for your exact yard
HomeSown turns your ZIP code into a personalized planting calendar, watering reminders, and pest help. Free to start.
Start your free garden →