Cold hardiness & minimum temperature

Is Jackfruit (Artocarpus heterophyllus)cold hardy? Hardiness zone & min temp

Also called Jackfruit, Jack, Nangka.

More about jackfruit

About Jackfruit

Artocarpus heterophyllus · also called Jackfruit, Jack · tropical

Jackfruit is a large evergreen tropical tree from South Asia producing the world's biggest tree-borne fruit, sometimes over 30 kg. The sweet ripe arils and starchy unripe flesh are both eaten, and the seeds are boiled like chestnuts. It is fast-growing, latex-bearing and strictly frost-free, needing deep soil, full sun and ample warmth and space.

Cold limit: USDA 10-12 (frost-tender; young trees killed by even light frost) · RHS H1b (22-35°C)

Watch for — Frost and cold damage: Young trees are killed by light frost and growth stalls in cool weather; protect or grow under cover outside the true tropics.

What jackfruit's hardiness rating actually means

Jackfruit is not cold hardy. It is a tropical houseplant that dies if it is left out through frost — there is no zone where it overwinters outdoors in a UK or cold-US climate. Its RHS rating of H1b means: Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season. On the US scale that maps to USDA 10-12 (frost-tender; young trees killed by even light frost) — 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 10 °C (sustained cold below this is damaging). Jackfruit has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for jackfruit as it gets too cold:

Below about about 10 °C, growth stalls and the leaves start to show cold stress — dark, water-soaked, or yellowing patches.
A single light frost blackens the foliage; a hard freeze kills the whole plant, roots included, and it does not recover.
Even a cold, draughty windowsill or an unheated porch in winter can be enough to damage it permanently.

Can jackfruit go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above 10 °C, in shade or dappled light, hardened off gradually.
Bring it back indoors well before the first autumn frost — do not wait for a frost warning, move it when nights drop toward 10-12 °C.
It will never overwinter outside in a temperate climate; the indoors is its winter home, full stop.

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 jackfruit can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Jackfruit hardiness — frequently asked questions

Is jackfruit cold hardy?

Jackfruit is not cold hardy. It is a tropical houseplant that dies if it is left out through frost — there is no zone where it overwinters outdoors in a UK or cold-US climate. Indoor-only in almost every home. Jackfruit can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12 (frost-tender; young trees killed by even light frost)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature jackfruit can survive?

Minimum survivable temperature is roughly about 10 °C (sustained cold below this is damaging). Jackfruit has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is jackfruit?

Jackfruit is rated USDA 10-12 (frost-tender; young trees killed by even light frost) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can jackfruit survive winter outside?

It can holiday outdoors in summer once nights are reliably above 10 °C, in shade or dappled light, hardened off gradually. Bring it back indoors well before the first autumn frost — do not wait for a frost warning, move it when nights drop toward 10-12 °C. It will never overwinter outside in a temperate climate; the indoors is its winter home, full stop.

What happens to jackfruit below its minimum temperature?

Below about about 10 °C, growth stalls and the leaves start to show cold stress — dark, water-soaked, or yellowing patches. A single light frost blackens the foliage; a hard freeze kills the whole plant, roots included, and it does not recover. Even a cold, draughty windowsill or an unheated porch in winter can be enough to damage it permanently.