Cold hardiness & minimum temperature

Is Hosui Asian pear (Pyrus pyrifolia 'Hosui')cold hardy? Hardiness zone & min temp

Also called Hosui Asian pear, Hosui pear, Japanese pear.

More about hosui asian pear

About Hosui Asian pear

Pyrus pyrifolia 'Hosui' · also called Hosui Asian pear, Hosui pear · edible

One of the most popular Asian pear cultivars, 'Hosui' bears large, russet-gold, round fruit with exceptionally juicy, sweet flesh. It ripens mid-season (late August to September) and needs a cross-pollinator. Full sun and well-drained soil are essential. Hardy to USDA zone 5 with 450–500 chill hours required.

Cold limit: USDA 5–9 · RHS H6 (-23 to 38°C)

What hosui asian pear's hardiness rating actually means

Yes — hosui asian pear is genuinely cold hardy. Rated RHS H6 and USDA 5–9, 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 5–9 — 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. Hosui Asian pear is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for hosui asian pear 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 hosui asian pear go outside or overwinter — and where?

Plant it out within USDA 5–9 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 hosui asian pear can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Hosui Asian pear hardiness — frequently asked questions

Is hosui asian pear cold hardy?

Yes — hosui asian pear is genuinely cold hardy. Rated RHS H6 and USDA 5–9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Hosui Asian pear is hardy across USDA 5–9; 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 hosui asian pear can survive?

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

What hardiness zone is hosui asian pear?

Hosui Asian pear is rated USDA 5–9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can hosui asian pear survive winter outside?

Plant it out within USDA 5–9 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 hosui asian pear 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.