Cold hardiness & minimum temperature

Is Cotinus obovatus (Cotinus obovatus)cold hardy? Hardiness zone & min temp

Also called American smoke tree, chittamwood.

More about cotinus obovatus

About Cotinus obovatus

Cotinus obovatus · also called American smoke tree, chittamwood · flowering

Cotinus obovatus is the American smoke tree, a tough native of rocky US uplands grown chiefly for spectacular autumn colour — leaves turn flaming shades of orange, scarlet and purple. Larger and hardier than its European cousin, it forms a small tree with sparse smoky flower plumes. Plant in full sun on poor, well-drained, even rocky alkaline soil.

Cold limit: USDA 4-8 · RHS H6 (-34 to 35°C)

What cotinus obovatus's hardiness rating actually means

Yes — cotinus obovatus is genuinely cold hardy. Rated RHS H6 and USDA 4-8, 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 4-8 — 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. Cotinus obovatus is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for cotinus obovatus 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 cotinus obovatus go outside or overwinter — and where?

Plant it out within USDA 4-8 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 cotinus obovatus can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Cotinus obovatus hardiness — frequently asked questions

Is cotinus obovatus cold hardy?

Yes — cotinus obovatus is genuinely cold hardy. Rated RHS H6 and USDA 4-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Cotinus obovatus is hardy across USDA 4-8; 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 cotinus obovatus can survive?

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

What hardiness zone is cotinus obovatus?

Cotinus obovatus is rated USDA 4-8 and RHS H6 — Hardy throughout the UK and northern Europe.

Can cotinus obovatus survive winter outside?

Plant it out within USDA 4-8 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 cotinus obovatus 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.