Cold hardiness & minimum temperature

Is Grape 'Reliance' (Vitis labrusca 'Reliance')cold hardy? Hardiness zone & min temp

Also called Reliance seedless grape.

More about grape 'reliance'

About Grape 'Reliance'

Vitis labrusca 'Reliance' · also called Reliance seedless grape · edible

'Reliance' is a cold-hardy, seedless American table grape from the University of Arkansas, producing medium-sized round red berries with tender skin and a sweet, mild, slightly labrusca flavour. Reliable and productive, it suits home gardeners in cooler regions, needing full sun, well-drained soil, sturdy support, and annual dormant pruning to crop on one-year-old wood.

Cold limit: USDA 4-8 · RHS H5 (15-30°C)

What grape 'reliance''s hardiness rating actually means

Yes — grape 'reliance' is genuinely cold hardy. Rated RHS H5 and USDA 4-8, 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 4-8 — 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 −15 to −10 °C. Grape 'Reliance' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for grape 'reliance' 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 grape 'reliance' go outside or overwinter — and where?

Plant it out within USDA 4-8 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 grape 'reliance' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Grape 'Reliance' hardiness — frequently asked questions

Is grape 'reliance' cold hardy?

Yes — grape 'reliance' is genuinely cold hardy. Rated RHS H5 and USDA 4-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Grape 'Reliance' is hardy across USDA 4-8; 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 grape 'reliance' can survive?

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

What hardiness zone is grape 'reliance'?

Grape 'Reliance' is rated USDA 4-8 and RHS H5 — Hardy in most of the UK and in cold winters.

Can grape 'reliance' survive winter outside?

Plant it out within USDA 4-8 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 grape 'reliance' 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.