Cold hardiness & minimum temperature

Is Peppermint (Mentha × piperita)cold hardy? Hardiness zone & min temp

Also called Brandy Mint.

More about peppermint

About Peppermint

Mentha × piperita · also called Brandy Mint · herb

Peppermint is a vigorous, cool-aromatic mint hybrid grown for its high-menthol leaves used in tea, desserts and oils. A hardy herbaceous perennial, it spreads aggressively by runners and is best contained in pots. Give it morning sun, consistently moist soil and regular harvesting to keep growth dense, leafy and flavorful.

Cold limit: USDA 3-11 (perennial outdoors; dies back in winter) · RHS H6 (15-24°C)

What peppermint's hardiness rating actually means

Yes — peppermint is genuinely cold hardy. Rated RHS H6 and USDA 3-11 (perennial outdoors; dies back in winter), it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H6 means: Hardy throughout the UK and northern Europe. On the US scale that maps to USDA 3-11 (perennial outdoors; dies back in winter) — 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 about −20 to −15 °C. Peppermint is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for peppermint as it gets too cold:

It tolerates winter lows to about −20 to −15 °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 peppermint go outside or overwinter — and where?

Plant it out within USDA 3-11 (perennial outdoors; dies back in winter) 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 peppermint can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Peppermint hardiness — frequently asked questions

Is peppermint cold hardy?

Yes — peppermint is genuinely cold hardy. Rated RHS H6 and USDA 3-11 (perennial outdoors; dies back in winter), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Peppermint is hardy across USDA 3-11 (perennial outdoors; dies back in winter); 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 peppermint can survive?

Minimum survivable temperature is roughly about −20 to −15 °C. Peppermint is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is peppermint?

Peppermint is rated USDA 3-11 (perennial outdoors; dies back in winter) and RHS H6 — Hardy throughout the UK and northern Europe.

Can peppermint survive winter outside?

Plant it out within USDA 3-11 (perennial outdoors; dies back in winter) 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 peppermint below its minimum temperature?

It tolerates winter lows to about −20 to −15 °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.