When to plant winter squash in zone 9a — planting calendar

Not your zone?

Showing USDA Zone 9A

Growing SeasonZone 9a

Last frost ~Feb 28First frost ~Nov 30Today

Start indoorsTransplant / sowHarvestFrost risk

JANFEBMARAPRMAYJUNJUL

Start indoors Feb 7 · Sow Mar 14 · First harvest Jun 2 · Wrap by Jun 23

Last spring frostFeb 28

Start seeds indoorsFeb 7

Direct sowMar 14

First harvestJun 2

Last harvestJun 23

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. 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 9a?

Winter Squash matures in about 80–110 days from sowing. In zone 9a that means sowing around Mar 14 and first picking around Jun 2.

Will winter squash survive frost in zone 9a?

No — winter squash 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 winter squash growing guide →