Cold hardiness & minimum temperature

Is Robin Hill serviceberry (Amelanchier x grandiflora 'Robin Hill')cold hardy? Hardiness zone & min temp

Also called Robin Hill serviceberry, Robin Hill apple serviceberry.

More about robin hill serviceberry

About Robin Hill serviceberry

Amelanchier x grandiflora 'Robin Hill' · also called Robin Hill serviceberry, Robin Hill apple serviceberry · flowering

Robin Hill serviceberry is a small ornamental tree prized for its pink-budded white blossoms in early spring, vivid autumn foliage in orange and red, and edible blue-black berries. It tolerates a range of soils, thrives in full sun to part shade, and is one of the most cold-hardy flowering trees suitable for temperate gardens.

Cold limit: USDA 4-9 · RHS H7 (-35 to 35°C)

What robin hill serviceberry's hardiness rating actually means

Yes — robin hill serviceberry is genuinely cold hardy. Rated RHS H7 and USDA 4-9, 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 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 below about −20 °C. Robin Hill serviceberry is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for robin hill serviceberry 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 robin hill serviceberry 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 robin hill serviceberry can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Robin Hill serviceberry hardiness — frequently asked questions

Is robin hill serviceberry cold hardy?

Yes — robin hill serviceberry is genuinely cold hardy. Rated RHS H7 and USDA 4-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Robin Hill serviceberry 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 robin hill serviceberry can survive?

Minimum survivable temperature is roughly below about −20 °C. Robin Hill serviceberry is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is robin hill serviceberry?

Robin Hill serviceberry is rated USDA 4-9 and RHS H7 — Hardy in the severest European continental winters.

Can robin hill serviceberry 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 robin hill serviceberry 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.