When to plant watermelon in zone 6b — planting calendar

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Showing USDA Zone 6B

Growing SeasonZone 6b

Last frost ~Apr 20First frost ~Oct 15Today

Start indoorsTransplant / sowHarvestFrost risk

MARAPRMAYJUNJULAUG

Start indoors Mar 23 · Transplant May 4 · First harvest Jul 13 · Wrap by Aug 3

Last spring frostApr 20

Start seeds indoorsMar 23

Transplant outMay 4

First harvestJul 13

Last harvestAug 3

First fall frostOct 15

Why these dates work in zone 6b

Zone 6b's last spring frost averages Apr 20 and first fall frost Oct 15 — about 178 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 6b?

Watermelon matures in about 70–90 days from transplanting. In zone 6b that means setting plants out around May 4 and first picking around Jul 13.

Will watermelon survive frost in zone 6b?

No — watermelon is frost-sensitive. In zone 6b, wait until after the last frost (around Apr 20) to plant, and harvest before the first fall frost (around Oct 15).

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