Cold hardiness & minimum temperature

Is Forrest Fir (Abies forrestii)cold hardy? Hardiness zone & min temp

Also called Forrest's Fir, Chinese Fir.

More about forrest fir

About Forrest Fir

Abies forrestii · also called Forrest's Fir, Chinese Fir · flowering

Forrest Fir is a beautiful ornamental conifer from the mountains of southwest China and Tibet, prized for its striking deep violet-blue upright cones and glossy dark green needles with bright white undersides. It thrives in cool, moist, highland conditions. Abies species are not listed by the ASPCA as individually toxic.

Cold limit: USDA 6-8 · RHS H6 (-20-22°C)

What forrest fir's hardiness rating actually means

Yes — forrest fir is genuinely cold hardy. Rated RHS H6 and USDA 6-8, 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 6-8 — 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. Forrest Fir is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for forrest fir 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 forrest fir go outside or overwinter — and where?

Plant it out within USDA 6-8 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 forrest fir can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Forrest Fir hardiness — frequently asked questions

Is forrest fir cold hardy?

Yes — forrest fir is genuinely cold hardy. Rated RHS H6 and USDA 6-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Forrest Fir is hardy across USDA 6-8; 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 forrest fir can survive?

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

What hardiness zone is forrest fir?

Forrest Fir is rated USDA 6-8 and RHS H6 — Hardy throughout the UK and northern Europe.

Can forrest fir survive winter outside?

Plant it out within USDA 6-8 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 forrest fir 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.