When to plant cucumber in zone 5b — planting calendar

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Showing USDA Zone 5B

Growing SeasonZone 5b

Last frost ~May 15First frost ~Sep 30Today

Start indoorsTransplant / sowHarvestFrost risk

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Start indoors Apr 24 · Sow May 29 · First harvest Jul 18 · Wrap by Sep 12

Last spring frostMay 15

Start seeds indoorsApr 24

Direct sowMay 29

First harvestJul 18

Last harvestSep 12

First fall frostSep 30

Why these dates work in zone 5b

Zone 5b's last spring frost averages May 15 and first fall frost Sep 30 — about 138 frost-free days. Cucumber 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 3 weeks ahead gives strong transplants ready the moment the soil warms.

Common questions

How long does cucumber take to grow in zone 5b?

Cucumber matures in about 50–70 days from sowing. In zone 5b that means sowing around May 29 and first picking around Jul 18.

Will cucumber survive frost in zone 5b?

No — cucumber is frost-sensitive. In zone 5b, wait until after the last frost (around May 15) to plant, and harvest before the first fall frost (around Sep 30).

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