When to plant cucumber 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

DECJANFEBMARAPRMAY

Start indoors Dec 25 · Sow Jan 29 · First harvest Mar 20 · Wrap by May 15

Last spring frostJan 15

Start seeds indoorsDec 25

Direct sowJan 29

First harvestMar 20

Last harvestMay 15

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. Cucumber 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 cucumber take to grow in zone 10b?

Cucumber matures in about 50–70 days from sowing. In zone 10b that means sowing around Jan 29 and first picking around Mar 20.

Will cucumber survive frost in zone 10b?

No — cucumber 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 cucumber growing guide →