Cold hardiness & minimum temperature

Is Chervil (Anthriscus cerefolium)cold hardy? Hardiness zone & min temp

Also called French Parsley, Garden Chervil.

More about chervil

About Chervil

Anthriscus cerefolium · also called French Parsley, Garden Chervil · herb

Chervil is a delicate annual herb of the carrot family with lacy, fern-like leaves and a mild aniseed-tinged parsley flavour central to French fines herbes. A cool-season crop, it grows fast and bolts in heat, so it does best in spring, autumn, and light shade. Repeated successional sowing keeps a steady supply of tender leaves.

Cold limit: USDA Grown as a cool-season annual; tolerates light frost (often sown zones 3-9) · RHS H3 (10-21°C)

Watch for — Damping-off and rot: Crowded seedlings in cold, wet soil rot at the base. Sow thinly, ensure good drainage, and avoid overwatering young plants.

What chervil's hardiness rating actually means

Hardiness works differently for chervil: 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 Grown as a cool-season annual; tolerates light frost (often sown zones 3-9) — 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 chervil 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 chervil 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 chervil 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 chervil

Chervil 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.

Chervil hardiness — frequently asked questions

Is chervil cold hardy?

Hardiness works differently for chervil: 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. Chervil is grown Grown as a cool-season annual; tolerates light frost (often sown zones 3-9); you sow after the last frost and harvest before the first one, then start again next year.

What is the minimum temperature chervil 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 chervil?

Chervil is rated USDA Grown as a cool-season annual; tolerates light frost (often sown zones 3-9) and RHS H3 — Half-hardy — comes through mild UK winters outside but is killed by a hard freeze.

Can chervil 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 chervil 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.