California · zones 7a–10b
When to plant zucchini in California.
Sow between Jan 21 to May 6 in a typical year, keyed to California's median last frost around Jan 14. A second, fall sowing fits Aug 30 to Sep 18. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Zucchini dates for a typical California season.
Direct sow
Jan 21 to May 6
Keyed to the ~Jan 14 last frost. Sow 1" deep, 24" apart.
Fall round
Aug 30 to Sep 18
Counted back from the ~Dec 14 first frost.
Harvest
~50 days later
~8 lb per plant over ~5 weeks.
California spans more than one climate: Zone 10 is the most common zone, but the state runs 7a to 10b. That's why the planner works from your ZIP code's frost dates, not your zone: mountain and coastal gardens in the same state can be three weeks apart.
In California: watch for
The pests that find zucchini here.
With about 334 frost-free days, squash, summer spends longer in the ground here than in most of the country, which widens the window in which squash bugs can find it. Scout weekly from midseason and act on the first signs.
Gray shield bugs; leaves wilt and get crispy patches.
Organic fix: Lay a board out overnight and collect them at dawn; scrape bronze egg clusters off leaf undersides.
Yellow striped or spotted beetles chewing leaves and blossoms.
Organic fix: Row cover until the first female flowers open, then hand-pick.
White powder coating the leaves late in the season.
Organic fix: Space for airflow, water the soil rather than the leaves, use resistant varieties.
Your season math: California gives zucchini about 334 frost-free days, and it needs roughly 50 days to a first harvest. That fits about 10 re-sown rounds across the season, so you can keep it coming instead of picking once.
Planting zucchini in California: questions
When should I plant zucchini in California?+
In a typical California year, sow zucchini between Jan 21 to May 6, keyed to the state's median last frost around Jan 14. There's also a fall window: Aug 30 to Sep 18. Your exact dates shift with your ZIP code and microclimate.
What USDA zone is California?+
California spans zones 7a–10b, mostly zone 10. But frost dates, not zones, set planting time. The free planner uses your ZIP code's actual frost dates.
How many zucchini plants do I need?+
Depends who you're feeding. The crop page has exact counts per household size, or the free planner does the math for your family in about 60 seconds.