Cold hardiness & minimum temperature

Is Sweet Cherry 'Sunburst' (Prunus avium 'Sunburst')cold hardy? Hardiness zone & min temp

Also called Sunburst cherry.

More about sweet cherry 'sunburst'

About Sweet Cherry 'Sunburst'

Prunus avium 'Sunburst' · also called Sunburst cherry · edible

Sunburst is a self-fertile sweet cherry bearing very large, almost black, soft-fleshed fruit with rich, sweet flavour in midsummer. Needing no pollination partner, it suits single-tree gardens and crops reliably on dwarfing rootstocks. The big, juicy cherries are tender and best eaten fresh, though the soft skins are prone to splitting in wet weather.

Cold limit: USDA 5-8 · RHS H6 (-25 to 30°C)

What sweet cherry 'sunburst''s hardiness rating actually means

Yes — sweet cherry 'sunburst' is genuinely cold hardy. Rated RHS H6 and USDA 5-8, 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 5-8 — 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. Sweet Cherry 'Sunburst' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for sweet cherry 'sunburst' 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 sweet cherry 'sunburst' go outside or overwinter — and where?

Plant it out within USDA 5-8 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 sweet cherry 'sunburst' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Sweet Cherry 'Sunburst' hardiness — frequently asked questions

Is sweet cherry 'sunburst' cold hardy?

Yes — sweet cherry 'sunburst' is genuinely cold hardy. Rated RHS H6 and USDA 5-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Sweet Cherry 'Sunburst' is hardy across USDA 5-8; 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 sweet cherry 'sunburst' can survive?

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

What hardiness zone is sweet cherry 'sunburst'?

Sweet Cherry 'Sunburst' is rated USDA 5-8 and RHS H6 — Hardy throughout the UK and northern Europe.

Can sweet cherry 'sunburst' survive winter outside?

Plant it out within USDA 5-8 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 sweet cherry 'sunburst' 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.