Cold hardiness & minimum temperature

Is Cedar of Lebanon (Cedrus libani)cold hardy? Hardiness zone & min temp

Also called Cedar of Lebanon, Lebanon Cedar.

More about cedar of lebanon

About Cedar of Lebanon

Cedrus libani · also called Cedar of Lebanon, Lebanon Cedar · flowering

Cedar of Lebanon is one of the most historically significant and architecturally majestic conifers in the world, native to the mountains of Lebanon, Turkey, and Syria. Famous for its flat-topped, layered crown in maturity and dark green to blue-green needle clusters, it is a landmark specimen tree for large estates in USDA zones 5–9, exceptionally long-lived and drought-tolerant.

Cold limit: USDA 5-9 · RHS H6 (-25 to 40°C)

What cedar of lebanon's hardiness rating actually means

Yes — cedar of lebanon 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. Cedar of Lebanon is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for cedar of lebanon 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 cedar of lebanon 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 cedar of lebanon can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Cedar of Lebanon hardiness — frequently asked questions

Is cedar of lebanon cold hardy?

Yes — cedar of lebanon 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. Cedar of Lebanon 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 cedar of lebanon can survive?

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

What hardiness zone is cedar of lebanon?

Cedar of Lebanon is rated USDA 5-9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can cedar of lebanon 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 cedar of lebanon 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.