Cold hardiness & minimum temperature

Is Carrot (Daucus carota)cold hardy? Hardiness zone & min temp

Also called garden carrot.

About Carrot

Daucus carota · also called garden carrot · edible

Carrot is a cool-season taproot that needs loose, stone-free soil and steady moisture to size up sweet uniform roots. A long-season crop best sown in spring and autumn. Pet-safe by ASPCA standards.

Daucus carota was domesticated from wild carrot in Central Asia, in what is now Afghanistan, before the 16th century; the earliest cultivated roots (around 900 CE) were purple and yellow, and it is a very cold-hardy cool-season root crop.

A very cold-hardy cool-season crop sown as soon as the ground can be worked in spring; slow to germinate, it tolerates frost and is often improved in flavor by cool weather.

Cold limit: USDA Grown as an annual in zones 3-11 · RHS H4 (hardy in most of UK) (10-21°C)

Sources: extension.umn.edu, extension.illinois.edu, edis.ifas.ufl.edu

What carrot's hardiness rating actually means

Hardiness works differently for carrot: 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 H4 means: Hardy in an average winter across much of the temperate world. On the US scale that maps to USDA Grown as an annual in zones 3-11 — 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 carrot 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 carrot 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 carrot can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

Frost protection for borderline carrot

Carrot 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.

Carrot hardiness — frequently asked questions

Is carrot cold hardy?

Hardiness works differently for carrot: 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. Carrot is grown Grown as an annual in zones 3-11; you sow after the last frost and harvest before the first one, then start again next year.

What is the minimum temperature carrot 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 carrot?

Carrot is rated USDA Grown as an annual in zones 3-11 and RHS H4 — Hardy in an average winter across much of the temperate world.

Can carrot 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 carrot 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.