Cold hardiness & minimum temperature

Is Celery (Apium graveolens)cold hardy? Hardiness zone & min temp

Also called Celery, Pascal Celery, Stalk Celery.

More about celery

About Celery

Apium graveolens · also called Celery, Pascal Celery · edible

Celery is a cool-season biennial grown as an annual vegetable, prized for its crisp, ribbed stalks with a distinctive savoury flavour. It demands consistent moisture, fertile soil, and a long, cool growing season of 130–140 days. Best transplanted as a seedling after the last frost; requires blanching for pale, mild-flavoured stems.

Cold limit: USDA 2-10 · RHS H3 (10 to 24°C)

Watch for — Bolting (premature flowering): Celery exposed to temperatures below 10°C for more than 10 consecutive days (vernalization) will bolt — sending up a flower stalk and making stalks pithy and bitter. Plant transplants outdoors only after the last frost when nights are reliably above 10°C. Choose bolt-resistant varieties in cool-summer climates.

What celery's hardiness rating actually means

Hardiness works differently for celery: it is grown as a seasonal crop, not overwintered. The question is not "what zone" but "how long is your frost-free growing window". Its RHS rating of H3 means: Half-hardy — comes through mild UK winters outside but is killed by a hard freeze. On the US scale that maps to USDA 2-10 — the zones where it can be left outdoors year-round.

New to these scales? The USDA hardiness zone map explained covers how the zone numbers work, and you can find your own zone with the zone finder.

Minimum temperature — and what happens below it

As an annual crop, its "minimum temperature" is the first hard frost — that is the end of the plant's life, not a survivable low. Many types are also damaged by light frost (around 0 °C).

Concretely, for celery as it gets too cold:

Light frost (around 0 to −2 °C) damages or kills tender summer crops outright; cold-hardy types take a few degrees of frost.
The plant does not "survive winter" — its life cycle simply ends, by design, when frost arrives or it finishes cropping.
A surprise late spring frost can also kill young transplants set out too early, before the season even starts.

Can celery go outside or overwinter — and where?

Time it to your frost dates: sow or plant out after the last spring frost, and aim to harvest before the first autumn frost.
In short-season zones, start it indoors or under cover to stretch the effective growing window.
Hardier crops in this group can be sown for an autumn or overwintered harvest in mild zones — check the specific crop.

Work back from your local frost dates with the frost-date calculator: the last spring frost and first autumn frost are what really decide when celery can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H3 figure above.

Frost protection for borderline celery

Celery is right on a hardiness edge in many gardens, so if you are pushing it, these measures buy it the margin it needs:

Use fleece, cloches or a cold frame at each end of the season to dodge a borderline frost and add growing weeks.
Have row cover ready for an unexpected late spring or early autumn frost.
Know your local last- and first-frost dates and count back the crop’s days-to-maturity to schedule the sowing.

Celery hardiness — frequently asked questions

Is celery cold hardy?

Hardiness works differently for celery: it is grown as a seasonal crop, not overwintered. The question is not "what zone" but "how long is your frost-free growing window". A seasonal crop, not a perennial. Celery is grown as an annual in USDA 2-10; you sow after the last frost and harvest before the first one, then start again next year.

What is the minimum temperature celery can survive?

As an annual crop, its "minimum temperature" is the first hard frost — that is the end of the plant's life, not a survivable low. Many types are also damaged by light frost (around 0 °C).

What hardiness zone is celery?

Celery is rated USDA 2-10 and RHS H3 — Half-hardy — comes through mild UK winters outside but is killed by a hard freeze.

Can celery survive winter outside?

Time it to your frost dates: sow or plant out after the last spring frost, and aim to harvest before the first autumn frost. In short-season zones, start it indoors or under cover to stretch the effective growing window. Hardier crops in this group can be sown for an autumn or overwintered harvest in mild zones — check the specific crop.

How do I protect celery from frost?

Use fleece, cloches or a cold frame at each end of the season to dodge a borderline frost and add growing weeks. Have row cover ready for an unexpected late spring or early autumn frost. Know your local last- and first-frost dates and count back the crop’s days-to-maturity to schedule the sowing.