When to plant watermelon 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

DECJANFEBMARAPRMAY

Start indoors Jan 3 · Transplant Feb 14 · First harvest Apr 25 · Wrap by May 16

Last spring frostJan 31

Start seeds indoorsJan 3

Transplant outFeb 14

First harvestApr 25

Last harvestMay 16

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. Watermelon 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 4 weeks ahead gives strong transplants ready the moment the soil warms.

Common questions

How long does watermelon take to grow in zone 10a?

Watermelon matures in about 70–90 days from transplanting. In zone 10a that means setting plants out around Feb 14 and first picking around Apr 25.

Will watermelon survive frost in zone 10a?

No — watermelon 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 watermelon growing guide →