When to plant winter squash in zone 10a — planting calendar

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Showing USDA Zone 10A

Growing SeasonZone 10a

Last frost ~Jan 31First frost ~Dec 15Today

Start indoorsTransplant / sowHarvestFrost risk

DECJANFEBMARAPRMAYJUN

Start indoors Jan 10 · Sow Feb 14 · First harvest May 5 · Wrap by May 26

Last spring frostJan 31

Start seeds indoorsJan 10

Direct sowFeb 14

First harvestMay 5

Last harvestMay 26

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. Winter Squash 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 3 weeks ahead gives strong transplants ready the moment the soil warms.

Common questions

How long does winter squash take to grow in zone 10a?

Winter Squash matures in about 80–110 days from sowing. In zone 10a that means sowing around Feb 14 and first picking around May 5.

Will winter squash survive frost in zone 10a?

No — winter squash 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 winter squash growing guide →