Cold hardiness & minimum temperature

Is Arugula (Eruca vesicaria)cold hardy? Hardiness zone & min temp

Also called Arugula, Rocket, Roquette, Rucola.

More about arugula

About Arugula

Eruca vesicaria · also called Arugula, Rocket · edible

Arugula is a fast-growing, cool-season salad leaf with a distinctive peppery, slightly nutty flavour. It matures in as little as 40 days from sowing and can be harvested as baby leaves in 20–25 days. Grow in full sun to partial shade in cool weather; hot temperatures cause rapid bolting and increasingly bitter, pungent leaves.

Cold limit: USDA 3-11 · RHS H5 (4 to 22°C)

Watch for — Bolting in warm weather: The primary challenge with arugula — triggered by long days (>13 hours) and temperatures above 22°C. Once bolted, leaves become small, increasingly pungent, and unsuitable for salads. Make successive small sowings every 2–3 weeks from early spring through early summer and again in late summer through autumn. Choose slow-bolt varieties for summer growing.

What arugula's hardiness rating actually means

Hardiness works differently for arugula: 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 H5 means: Hardy in most of the UK and in cold winters. On the US scale that maps to USDA 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 arugula 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 arugula 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 arugula can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Frost protection for borderline arugula

Arugula 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.

Arugula hardiness — frequently asked questions

Is arugula cold hardy?

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

What is the minimum temperature arugula 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 arugula?

Arugula is rated USDA 3-11 and RHS H5 — Hardy in most of the UK and in cold winters.

Can arugula 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 arugula 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.