When to plant zucchini in zone 5a — planting calendar

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Showing USDA Zone 5A

Growing SeasonZone 5a

Last frost ~May 10First frost ~Oct 1Today

Start indoorsTransplant / sowHarvestFrost risk

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Start indoors Apr 19 · Sow May 17 · First harvest Jul 1 · Wrap by Sep 9

Last spring frostMay 10

Start seeds indoorsApr 19

Direct sowMay 17

First harvestJul 1

Last harvestSep 9

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. Zucchini is frost-sensitive, so the 1w 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 zucchini take to grow in zone 5a?

Zucchini matures in about 45–60 days from sowing. In zone 5a that means sowing around May 17 and first picking around Jul 1.

Will zucchini survive frost in zone 5a?

No — zucchini 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 zucchini growing guide →