Cold hardiness & minimum temperature

Is Acer rubrum 'Autumn Blaze' (Acer rubrum 'Autumn Blaze')cold hardy? Hardiness zone & min temp

Also called Autumn Blaze Maple.

More about acer rubrum 'autumn blaze'

About Acer rubrum 'Autumn Blaze'

Acer rubrum 'Autumn Blaze' · also called Autumn Blaze Maple · flowering

'Autumn Blaze' is a vigorous freeman maple hybrid (Acer rubrum × saccharinum) combining red maple's long-lasting orange-red autumn colour with silver maple's fast growth and adaptability. It forms a broadly oval, well-branched shade tree, carries small red spring flowers, and tolerates a wide range of soils and urban conditions in full sun.

Cold limit: USDA 3-8 · RHS H7 (-35 to 35°C)

Watch for — Storm and frost limb damage: Rapid, somewhat brittle growth makes branches vulnerable to wind, ice and late frosts. Stake and train young trees and remove damaged wood promptly.

What acer rubrum 'autumn blaze''s hardiness rating actually means

Yes — acer rubrum 'autumn blaze' is genuinely cold hardy. Rated RHS H7 and USDA 3-8, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H7 means: Hardy in the severest European continental winters. On the US scale that maps to USDA 3-8 — 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 below about −20 °C. Acer rubrum 'Autumn Blaze' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for acer rubrum 'autumn blaze' as it gets too cold:

It tolerates winter lows to about −20 °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 acer rubrum 'autumn blaze' go outside or overwinter — and where?

Plant it out within USDA 3-8 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 acer rubrum 'autumn blaze' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Acer rubrum 'Autumn Blaze' hardiness — frequently asked questions

Is acer rubrum 'autumn blaze' cold hardy?

Yes — acer rubrum 'autumn blaze' is genuinely cold hardy. Rated RHS H7 and USDA 3-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Acer rubrum 'Autumn Blaze' is hardy across USDA 3-8; 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 acer rubrum 'autumn blaze' can survive?

Minimum survivable temperature is roughly below about −20 °C. Acer rubrum 'Autumn Blaze' is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is acer rubrum 'autumn blaze'?

Acer rubrum 'Autumn Blaze' is rated USDA 3-8 and RHS H7 — Hardy in the severest European continental winters.

Can acer rubrum 'autumn blaze' survive winter outside?

Plant it out within USDA 3-8 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 acer rubrum 'autumn blaze' below its minimum temperature?

It tolerates winter lows to about −20 °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.