When to plant corn in zone 10b — planting calendar

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Showing USDA Zone 10B

Growing SeasonZone 10b

Last frost ~Jan 15First frost ~Dec 31Today

Start indoorsTransplant / sowHarvestFrost risk

JANFEBMARAPRMAY

Sow Jan 29 · First harvest Apr 9 · Wrap by Apr 30

Last spring frostJan 15

Direct sowJan 29

First harvestApr 9

Last harvestApr 30

First fall frostDec 31

Why these dates work in zone 10b

Zone 10b's last spring frost averages Jan 15 and first fall frost Dec 31 — about 350 frost-free days. Corn 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.

Common questions

How long does corn take to grow in zone 10b?

Corn matures in about 70–90 days from sowing. In zone 10b that means sowing around Jan 29 and first picking around Apr 9.

Will corn survive frost in zone 10b?

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

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