Cold hardiness & minimum temperature

Is Kentia palm (Howea forsteriana)cold hardy? Hardiness zone & min temp

Also called paradise palm, thatch palm, howea.

About Kentia palm

Howea forsteriana · also called paradise palm, thatch palm · houseplant

Kentia palm is an elegant slow-growing palm from Lord Howe Island with arching dark green fronds. Famously tolerant of low light, dry air, and neglect — once a Victorian parlour favourite. Pet-safe and one of the safest palms to keep with curious cats and dogs.

Howea forsteriana, the kentia palm, is endemic to Lord Howe Island off Australia, a single-trunked feather palm with arching fronds (growers often pot several together for fullness).

Slow-growing from a single growing point (no branching), which means a damaged crown is not replaced; non-toxic to dogs, cats, and horses per the ASPCA, a reliable pet-safe statement palm.

Cold limit: USDA 10-11 (indoor in most US homes) · RHS H1c (18-24°C)

Sources: aspca.org, plants.ces.ncsu.edu, guide-to-houseplants.com

What kentia palm's hardiness rating actually means

Kentia palm 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 H1c means: Warm-temperate — can summer outdoors but must come in well before the first frost. On the US scale that maps to USDA 10-11 (indoor 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 5 °C (and never frost). Kentia palm has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for kentia palm as it gets too cold:

Below about about 5 °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 kentia palm go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above 5 °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 kentia palm can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Kentia palm hardiness — frequently asked questions

Is kentia palm cold hardy?

Kentia palm 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. Kentia palm can only live outside year-round in genuinely frost-free climates (roughly USDA 10-11 (indoor in most US homes)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature kentia palm can survive?

Minimum survivable temperature is roughly about 5 °C (and never frost). Kentia palm has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is kentia palm?

Kentia palm is rated USDA 10-11 (indoor in most US homes) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can kentia palm survive winter outside?

It can holiday outdoors in summer once nights are reliably above 5 °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 kentia palm below its minimum temperature?

Below about about 5 °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.