Cold hardiness & minimum temperature

Is Keitt Mango (Mangifera indica 'Keitt')cold hardy? Hardiness zone & min temp

Also called Keitt mango.

More about keitt mango

About Keitt Mango

Mangifera indica 'Keitt' · also called Keitt mango · tropical

'Keitt' is a very late-season mango bearing large, sweet, nearly fibreless green-skinned fruit that often stays greenish when ripe. A tropical evergreen, it needs heat, full sun and a dry spell to flower, and tolerates marginal warm climates better than many. Frost-sensitive, it crops outdoors only in frost-free zones, or under glass elsewhere.

Cold limit: USDA 10-12 (frost-free; greenhouse/container elsewhere) · RHS H1b (21-35°C)

Watch for — Hard to judge ripeness: 'Keitt' often stays green-skinned when ripe, so colour is a poor guide. Judge by a slight softening, full size and fragrance, and harvest before frost given its very late season.

What keitt mango's hardiness rating actually means

Keitt Mango 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-free; greenhouse/container elsewhere) — 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). Keitt Mango has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Keitt Mango hardiness — frequently asked questions

Is keitt mango cold hardy?

Keitt Mango 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. Keitt Mango can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12 (frost-free; greenhouse/container elsewhere)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature keitt mango can survive?

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

What hardiness zone is keitt mango?

Keitt Mango is rated USDA 10-12 (frost-free; greenhouse/container elsewhere) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can keitt mango 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 keitt mango 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.