Cold hardiness & minimum temperature

Is Portugal quince (Cydonia oblonga 'Portugal')cold hardy? Hardiness zone & min temp

Also called Portugal quince, Lusitanica quince, Portuguese quince.

More about portugal quince

About Portugal quince

Cydonia oblonga 'Portugal' · also called Portugal quince, Lusitanica quince · edible

'Portugal' is one of the oldest and most vigorous quince cultivars, producing large, pear-shaped, golden fruit with deep pink-red flesh when cooked — prized for quince paste (membrillo) and jelly. It ripens October–November, is self-fertile, and performs especially well in warm, sheltered gardens in the UK and mild temperate regions.

Cold limit: USDA 6–9 · RHS H5 (-15 to 40°C)

Watch for — Brown rot (Monilinia fructigena): Affects fruit in a wet harvest season, producing soft, rotting patches covered in grey-brown spore rings. Harvest promptly when ripe; remove all mummified fruits and debris from the tree over winter. Prune to improve canopy airflow.

What portugal quince's hardiness rating actually means

Yes — portugal quince is genuinely cold hardy. Rated RHS H5 and USDA 6–9, 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 6–9 — 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. Portugal quince is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for portugal quince 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 portugal quince go outside or overwinter — and where?

Plant it out within USDA 6–9 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 portugal quince can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Portugal quince hardiness — frequently asked questions

Is portugal quince cold hardy?

Yes — portugal quince is genuinely cold hardy. Rated RHS H5 and USDA 6–9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Portugal quince is hardy across USDA 6–9; 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 portugal quince can survive?

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

What hardiness zone is portugal quince?

Portugal quince is rated USDA 6–9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can portugal quince survive winter outside?

Plant it out within USDA 6–9 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 portugal quince 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.