Cabbage in Zone 10a & 10b
Brassica oleracea
When to plant cabbage 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. Cabbage needs a head start most zones can't give it by direct-sowing alone.
| Window | Fall window |
|---|---|
| Start indoors | Aug–Dec |
| Direct sow / transplant outside | Sep–Jan |
| Estimated harvest | Nov 10–Apr 11 '27 (~70 days after transplanting) |
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 1-1.5 ft.
Zone 10b dates sourced from growinginthegarden.com.
Cabbage takes up a full square foot for months and won't forgive a rushed transplant date. Start it too late into warm weather and it's more likely to bolt or stall than to head up properly.
How cabbage fits zone 10's season
Zone 10b's frost-free window runs about 324 days, from January 30 to December 20. Cabbage needs about 70 days from transplant to first harvest.
Good companions
- Onion: Onion scent is reputed to confuse cabbage moths. The research behind this is real but garlic-specific (field trials intercropping garlic with cabbage reduced diamondback moth damage) — onion hasn't been tested the same way, so treat the onion version as a reasonable extrapolation, not a directly measured result.
Where to buy cabbage seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing cabbage" 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 Cabbage in USDA zone 10b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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