When to plant bush beans in zone 4b — planting calendar

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Showing USDA Zone 4B

Growing SeasonZone 4b

Last frost ~May 15First frost ~Sep 25Today

Start indoorsTransplant / sowHarvestFrost risk

MAYJUNJULAUG

Sow May 29 · First harvest Jul 18 · Wrap by Aug 8

Last spring frostMay 15

Direct sowMay 29

First harvestJul 18

Last harvestAug 8

First fall frostSep 25

Why these dates work in zone 4b

Zone 4b's last spring frost averages May 15 and first fall frost Sep 25 — about 133 frost-free days. Bush Beans 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.

Common questions

How long does bush beans take to grow in zone 4b?

Bush Beans matures in about 50–65 days from sowing. In zone 4b that means sowing around May 29 and first picking around Jul 18.

Will bush beans survive frost in zone 4b?

No — bush beans is frost-sensitive. In zone 4b, wait until after the last frost (around May 15) to plant, and harvest before the first fall frost (around Sep 25).

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