Zucchini in Zone 10a & 10b
Cucurbita pepo
When to plant zucchini in zone 10b
Zones 10a and 10b share the same average frost dates in our data, so this page covers both.
Method: Start indoors: Start indoors from seed, then transplant outside. In your zone, Zucchini needs a head start on the heat that direct-sowing elsewhere doesn't require.
| Window | Spring window |
|---|---|
| Start indoors | Jan–Feb |
| Direct sow / transplant outside | Feb–Mar |
| Estimated harvest | Mar 23–May 20 (~50 days after transplanting) |
| Window | Monsoon window |
|---|---|
| Start indoors | Jul–Aug |
| Direct sow / transplant outside | Aug–Sep |
| Estimated harvest | Sep 20–Nov 19 (~50 days after transplanting) |
Spacing: about 4 square feet per plant (square-foot-gardening spacing). Mature height: 2-3 ft.
Zone 10b dates sourced from growinginthegarden.com.
Zucchini's reputation for overwhelming a garden is well-earned: a single healthy plant can produce more squash than most households can eat, which is exactly why our planting calendar puts just one plant per square foot rather than clustering several together.
How zucchini fits zone 10's season
Zone 10b's frost-free window runs about 324 days, from January 30 to December 20. Zucchini needs about 50 days from sowing to first harvest.
Good companions
- Marigold: Marigolds deter squash bugs and beetles.
- Nasturtium: Nasturtium is a trap crop that draws aphids away from squash.
Where to buy zucchini seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing zucchini" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 10b calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →
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Growing Zucchini in USDA zone 10b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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