Cold hardiness & minimum temperature

Is Climbing Iceberg Rose (Rosa 'Climbing Iceberg')cold hardy? Hardiness zone & min temp

Also called Climbing Iceberg, Schneewittchen Climber.

More about climbing iceberg rose

About Climbing Iceberg Rose

Rosa 'Climbing Iceberg' · also called Climbing Iceberg, Schneewittchen Climber · flowering

Climbing Iceberg is the climbing sport of the famous 1958 floribunda 'Iceberg', bearing abundant pure-white, lightly fragrant semi-double blooms in large clusters from early summer to autumn. Vigorous, healthy, and almost thornless, it is one of the most popular white climbers, ideal for walls, arches, pergolas, and pillars in cottage and formal gardens alike.

Cold limit: USDA 5-9 · RHS H6 (-23 to 32°C)

What climbing iceberg rose's hardiness rating actually means

Yes — climbing iceberg rose is genuinely cold hardy. Rated RHS H6 and USDA 5-9, 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 5-9 — 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 about −20 to −15 °C. Climbing Iceberg Rose is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for climbing iceberg rose 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 climbing iceberg rose go outside or overwinter — and where?

Plant it out within USDA 5-9 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 climbing iceberg rose can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Climbing Iceberg Rose hardiness — frequently asked questions

Is climbing iceberg rose cold hardy?

Yes — climbing iceberg rose is genuinely cold hardy. Rated RHS H6 and USDA 5-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Climbing Iceberg Rose is hardy across USDA 5-9; 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 climbing iceberg rose can survive?

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

What hardiness zone is climbing iceberg rose?

Climbing Iceberg Rose is rated USDA 5-9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can climbing iceberg rose survive winter outside?

Plant it out within USDA 5-9 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 climbing iceberg rose 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.