When to plant basil in zone 10a — planting calendar

Not your zone?

Showing USDA Zone 10A

Growing SeasonZone 10a

Last frost ~Jan 31First frost ~Dec 15Today

Start indoorsTransplant / sowHarvestFrost risk

DECJANFEBMARAPRMAYJUN

Start indoors Jan 3 · Sow Feb 14 · First harvest Mar 11 · Wrap by Jun 3

Last spring frostJan 31

Start seeds indoorsJan 3

Direct sowFeb 14

First harvestMar 11

Last harvestJun 3

First fall frostDec 15

Why these dates work in zone 10a

Zone 10a's last spring frost averages Jan 31 and first fall frost Dec 15 — about 318 frost-free days. Basil is frost-sensitive, so the 2w after frost timing builds in a safety margin against a late cold snap — setting plants out too early risks losing them to frost. Starting seeds indoors 4 weeks ahead gives strong transplants ready the moment the soil warms.

Common questions

How long does basil take to grow in zone 10a?

Basil matures in about 25–35 days from sowing. In zone 10a that means sowing around Feb 14 and first picking around Mar 11.

Will basil survive frost in zone 10a?

No — basil is frost-sensitive. In zone 10a, wait until after the last frost (around Jan 31) to plant, and harvest before the first fall frost (around Dec 15).

For soil, spacing, pests and companion planting, see the full basil growing guide →