When to plant zucchini 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

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Start indoors Mar 30 · Sow Apr 27 · First harvest Jun 11 · Wrap by Aug 20

Last spring frostApr 20

Start seeds indoorsMar 30

Direct sowApr 27

First harvestJun 11

Last harvestAug 20

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. 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 6b?

Zucchini matures in about 45–60 days from sowing. In zone 6b that means sowing around Apr 27 and first picking around Jun 11.

Will zucchini survive frost in zone 6b?

No — zucchini 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 zucchini growing guide →