Cold hardiness & minimum temperature

Is Monstera (Monstera deliciosa)cold hardy? Hardiness zone & min temp

Also called Swiss cheese plant, Mexican breadfruit, split-leaf philodendron.

About Monstera

Monstera deliciosa · also called Swiss cheese plant, Mexican breadfruit · tropical

Monstera is a climbing tropical aroid from Central American rainforests. Indoors it wants bright indirect light, chunky aroid mix, and a moss pole to develop its famous fenestrated leaves. Water when the top 2-3 cm of soil is dry. It is mildly toxic to cats and dogs because of insoluble calcium oxalates.

Monstera deliciosa is native to the tropical rainforests of southern Mexico through Central America to Panama, where it grows as a hemiepiphyte: it germinates on the floor then climbs tree trunks with aerial roots toward the canopy light.

A vigorous climber that can ascend host trees many metres in the wild; it holds the RHS Award of Garden Merit and is a tender plant suited only to warm indoor or glasshouse conditions (USDA zones 10-12), not frost-hardy.

Cold limit: USDA 10-12 (indoor-only in most US homes) · RHS H1b (heated greenhouse / indoor only) (18-27°C)

Sources: rhs.org.uk, missouribotanicalgarden.org, digitalcommons.usf.edu

What monstera's hardiness rating actually means

Monstera 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 (indoor-only in most US homes) — 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). Monstera has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Monstera hardiness — frequently asked questions

Is monstera cold hardy?

Monstera 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. Monstera can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12 (indoor-only in most US homes)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature monstera can survive?

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

What hardiness zone is monstera?

Monstera is rated USDA 10-12 (indoor-only in most US homes) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can monstera 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 monstera 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.