When to plant basil in zone 9a — planting calendar

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Showing USDA Zone 9A

Growing SeasonZone 9a

Last frost ~Feb 28First frost ~Nov 30Today

Start indoorsTransplant / sowHarvestFrost risk

JANFEBMARAPRMAYJUNJUL

Start indoors Jan 31 · Sow Mar 14 · First harvest Apr 8 · Wrap by Jul 1

Last spring frostFeb 28

Start seeds indoorsJan 31

Direct sowMar 14

First harvestApr 8

Last harvestJul 1

First fall frostNov 30

Why these dates work in zone 9a

Zone 9a's last spring frost averages Feb 28 and first fall frost Nov 30 — about 275 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 9a?

Basil matures in about 25–35 days from sowing. In zone 9a that means sowing around Mar 14 and first picking around Apr 8.

Will basil survive frost in zone 9a?

No — basil is frost-sensitive. In zone 9a, wait until after the last frost (around Feb 28) to plant, and harvest before the first fall frost (around Nov 30).

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