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

Hosui is a leading Japanese Asian pear cultivar producing large, russet-gold, round fruit with extraordinarily crisp, juicy flesh and a honey-sweet flavour. Unlike European pears it is eaten tree-ripened while firm. Requiring around 450–500 chill hours, it suits mild-winter zones 5–9. Needs cross-pollination from another Asian pear (e.g., Nijisseiki or Shinseiki).

Cold limit: USDA 5-9 · RHS H5 (-18 to 36°C)

What hosui asian pear's hardiness rating actually means

Yes — hosui asian pear is genuinely cold hardy. Rated RHS H5 and USDA 5-9, 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 — 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. 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 −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 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 H5 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 H5 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 −15 to −10 °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 H5 — Hardy in most of the UK and in cold winters.

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 −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.