When to plant zucchini in zone 9b — planting calendar

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Showing USDA Zone 9B

Growing SeasonZone 9b

Last frost ~Feb 15First frost ~Dec 10Today

Start indoorsTransplant / sowHarvestFrost risk

JANFEBMARAPRMAYJUN

Start indoors Jan 25 · Sow Feb 22 · First harvest Apr 8 · Wrap by Jun 17

Last spring frostFeb 15

Start seeds indoorsJan 25

Direct sowFeb 22

First harvestApr 8

Last harvestJun 17

First fall frostDec 10

Why these dates work in zone 9b

Zone 9b's last spring frost averages Feb 15 and first fall frost Dec 10 — about 298 frost-free days. Zucchini is frost-sensitive, so the 1w 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 3 weeks ahead gives strong transplants ready the moment the soil warms.

Common questions

How long does zucchini take to grow in zone 9b?

Zucchini matures in about 45–60 days from sowing. In zone 9b that means sowing around Feb 22 and first picking around Apr 8.

Will zucchini survive frost in zone 9b?

No — zucchini is frost-sensitive. In zone 9b, wait until after the last frost (around Feb 15) to plant, and harvest before the first fall frost (around Dec 10).

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