When to plant watermelon in zone 5a — planting calendar

Not your zone?

Showing USDA Zone 5A

Growing SeasonZone 5a

Last frost ~May 10First frost ~Oct 1Today

Start indoorsTransplant / sowHarvestFrost risk

APRMAYJUNJULAUGSEP

Start indoors Apr 12 · Transplant May 24 · First harvest Aug 2 · Wrap by Aug 23

Last spring frostMay 10

Start seeds indoorsApr 12

Transplant outMay 24

First harvestAug 2

Last harvestAug 23

First fall frostOct 1

Why these dates work in zone 5a

Zone 5a's last spring frost averages May 10 and first fall frost Oct 1 — about 144 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 5a?

Watermelon matures in about 70–90 days from transplanting. In zone 5a that means setting plants out around May 24 and first picking around Aug 2.

Will watermelon survive frost in zone 5a?

No — watermelon is frost-sensitive. In zone 5a, wait until after the last frost (around May 10) to plant, and harvest before the first fall frost (around Oct 1).

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