Cold hardiness & minimum temperature

Is Solaris Grape (Vitis vinifera 'Solaris')cold hardy? Hardiness zone & min temp

Also called Solaris grape, disease-resistant white grape.

More about solaris grape

About Solaris Grape

Vitis vinifera 'Solaris' · also called Solaris grape, disease-resistant white grape · edible

Solaris is a modern disease-resistant white wine grape bred for cool northern climates, valued for early ripening, high sugars and strong resistance to downy and powdery mildew. A vigorous deciduous woody vine, it crops reliably even in marginal regions. Grow it in full sun on a sturdy trellis in deep, free-draining soil with annual dormant pruning.

Cold limit: USDA 5-9 (hardier and cooler-climate adapted than most vinifera) · RHS H5 (15-28°C)

What solaris grape's hardiness rating actually means

Yes — solaris grape is genuinely cold hardy. Rated RHS H5 and USDA 5-9 (hardier and cooler-climate adapted than most vinifera), it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H5 means: Hardy in most of the UK and in cold winters. On the US scale that maps to USDA 5-9 (hardier and cooler-climate adapted than most vinifera) — 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 −15 to −10 °C. Solaris Grape is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for solaris grape as it gets too cold:

It tolerates winter lows to about −15 to −10 °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 solaris grape go outside or overwinter — and where?

Plant it out within USDA 5-9 (hardier and cooler-climate adapted than most vinifera) 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 solaris grape can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Solaris Grape hardiness — frequently asked questions

Is solaris grape cold hardy?

Yes — solaris grape is genuinely cold hardy. Rated RHS H5 and USDA 5-9 (hardier and cooler-climate adapted than most vinifera), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Solaris Grape is hardy across USDA 5-9 (hardier and cooler-climate adapted than most vinifera); 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 solaris grape can survive?

Minimum survivable temperature is roughly about −15 to −10 °C. Solaris Grape is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is solaris grape?

Solaris Grape is rated USDA 5-9 (hardier and cooler-climate adapted than most vinifera) and RHS H5 — Hardy in most of the UK and in cold winters.

Can solaris grape survive winter outside?

Plant it out within USDA 5-9 (hardier and cooler-climate adapted than most vinifera) 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 solaris grape below its minimum temperature?

It tolerates winter lows to about −15 to −10 °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.