Cold hardiness & minimum temperature

Is Acer rubrum 'October Glory' (Acer rubrum 'October Glory')cold hardy? Hardiness zone & min temp

Also called October Glory Red Maple.

More about acer rubrum 'october glory'

About Acer rubrum 'October Glory'

Acer rubrum 'October Glory' · also called October Glory Red Maple · flowering

'October Glory' is a popular red maple cultivar grown for reliable, brilliant crimson-red autumn foliage that colours late and holds well. A vigorous, oval-crowned shade tree, it carries small red spring flowers before the leaves. It thrives in full sun to part shade and moist, slightly acid soil, tolerating a range of conditions as a fine street or lawn tree.

Cold limit: USDA 4-9 · RHS H6 (-30 to 35°C)

What acer rubrum 'october glory''s hardiness rating actually means

Yes — acer rubrum 'october glory' is genuinely cold hardy. Rated RHS H6 and USDA 4-9, 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 4-9 — 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. Acer rubrum 'October Glory' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for acer rubrum 'october glory' 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 acer rubrum 'october glory' go outside or overwinter — and where?

Plant it out within USDA 4-9 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 acer rubrum 'october glory' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Acer rubrum 'October Glory' hardiness — frequently asked questions

Is acer rubrum 'october glory' cold hardy?

Yes — acer rubrum 'october glory' is genuinely cold hardy. Rated RHS H6 and USDA 4-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Acer rubrum 'October Glory' is hardy across USDA 4-9; 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 acer rubrum 'october glory' can survive?

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

What hardiness zone is acer rubrum 'october glory'?

Acer rubrum 'October Glory' is rated USDA 4-9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can acer rubrum 'october glory' survive winter outside?

Plant it out within USDA 4-9 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 acer rubrum 'october glory' 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.