When to plant celery in zone 4b — planting calendar

Not your zone?

Showing USDA Zone 4B

Growing SeasonZone 4b

Last frost ~May 15First frost ~Sep 25Today

Start indoorsTransplant / sowHarvestFrost risk

FEBMARAPRMAYJUNJULAUGSEP

Start indoors Mar 6 · Transplant May 1 · First harvest Aug 9 · Wrap by Sep 6

Last spring frostMay 15

Start seeds indoorsMar 6

Transplant outMay 1

First harvestAug 9

Last harvestSep 6

Fall succession sowJun 12

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. Celery tolerates light frost, so you can set plants out ahead of the last-frost date and keep harvesting into the cooler fall. Starting seeds indoors 10 weeks ahead gives strong transplants ready the moment the soil warms. There's also room for a fall succession sowing around Jun 12 for a second harvest before frost.

Common questions

How long does celery take to grow in zone 4b?

Celery matures in about 100–120 days from transplanting. In zone 4b that means setting plants out around May 1 and first picking around Aug 9.

Will celery survive frost in zone 4b?

Yes — celery tolerates light frost. In zone 4b you can set plants out a little before the last frost (around May 15) and keep harvesting past the first fall frost (around Sep 25).

Can I plant a second crop of celery in zone 4b?

Yes — in zone 4b there's time for a fall sowing around Jun 12 for a second harvest before frost.

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