Cold hardiness & minimum temperature

Is Caraway (Carum carvi)cold hardy? Hardiness zone & min temp

Also called Caraway, Meridian Fennel, Persian Cumin.

More about caraway

About Caraway

Carum carvi · also called Caraway, Meridian Fennel · herb

Caraway is a biennial herb in the carrot family, prized for its distinctively flavoured seeds used widely in European baking, sauerkraut, and liqueurs. It produces feathery, fern-like foliage in year one, then flowers and sets seed in year two. The seeds, roots, and young leaves are all edible. Grow in full sun with well-drained, moderately fertile soil.

Cold limit: USDA 3-9 · RHS H7 (-20 to 30°C)

Watch for — Failure to flower (plant treated as annual): Caraway requires two full growing seasons to flower and set seed — treating it as an annual results in no seed harvest. Sow in the same spot or transplant carefully in autumn of the first year; roots and cold vernalization are required to trigger second-year flowering.

What caraway's hardiness rating actually means

Yes — caraway is genuinely cold hardy. Rated RHS H7 and USDA 3-9, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H7 means: Hardy in the severest European continental winters. On the US scale that maps to USDA 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

Minimum survivable temperature is roughly below about −20 °C. Caraway is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for caraway as it gets too cold:

It tolerates winter lows to about −20 °C once established.
Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root.
First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.

Can caraway go outside or overwinter — and where?

Plant it out within USDA 3-9 and it overwinters with little or no help.
It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy.
The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

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 caraway can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Caraway hardiness — frequently asked questions

Is caraway cold hardy?

Yes — caraway is genuinely cold hardy. Rated RHS H7 and USDA 3-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Caraway is hardy across USDA 3-9; it belongs in the ground or a frost-proof container, not on a windowsill, and many types actively need a cold winter to perform.

What is the minimum temperature caraway can survive?

Minimum survivable temperature is roughly below about −20 °C. Caraway is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is caraway?

Caraway is rated USDA 3-9 and RHS H7 — Hardy in the severest European continental winters.

Can caraway survive winter outside?

Plant it out within USDA 3-9 and it overwinters with little or no help. It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy. The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

What happens to caraway below its minimum temperature?

It tolerates winter lows to about −20 °C once established. Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root. First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.