Pepper in Zone 10a & 10b
Capsicum annuum
When to plant pepper 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. Pepper needs a head start most zones can't give it by direct-sowing alone.
| Window | Spring window |
|---|---|
| Start indoors | Dec–Feb |
| Direct sow / transplant outside | Feb–Apr |
| Estimated harvest | Apr 17–Jul 14 (~75 days after transplanting) |
| Window | Monsoon window |
|---|---|
| Start indoors | May–Jul |
| Direct sow / transplant outside | Jul–Sep |
| Estimated harvest | Sep 14–Dec 14 (~75 days after transplanting) |
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 1.5-3 ft.
Zone 10b dates sourced from growinginthegarden.com.
Peppers are close cousins to tomatoes in care, but slower to get going and less forgiving of a cold snap. They stall out below about 55°F, where tomatoes just slow down. That's why our planting calendar generally has peppers starting indoors even earlier than tomatoes.
How pepper fits zone 10's season
Zone 10b's frost-free window runs about 324 days, from January 30 to December 20. Pepper needs about 75 days from transplant to first harvest.
Heat warning for zone 10b: Zone 10b summer nights commonly exceed 75°F, which stalls pollination and causes blossom drop in Pepper at the height of summer (University of Maryland Extension, via UDel Cooperative Extension). Expect a slow patch for fruit set during the hottest stretch even though the plant keeps growing. It typically resumes once nights cool.
Good companions
- Basil: Reputed to repel aphids and improve pepper growth nearby, but a controlled garden trial testing this same claim on a related crop found no pest-reduction benefit from basil, and actually found higher pest counts on the basil-companioned plants — treat this pairing as unproven, not as a working pest deterrent.
- Onion: Reputed to deter many common pepper pests, though this specific pairing hasn't been tested the way onion/carrot pest-masking has — treat it as garden tradition.
Where to buy pepper seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing pepper" 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 Pepper in USDA zone 10b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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