Cold hardiness & minimum temperature

Is Yellow Trumpet Creeper (Campsis radicans 'Flava')cold hardy? Hardiness zone & min temp

Also called Yellow Trumpet Creeper, Yellow Trumpet Vine, Flava Trumpet Vine.

More about yellow trumpet creeper

About Yellow Trumpet Creeper

Campsis radicans 'Flava' · also called Yellow Trumpet Creeper, Yellow Trumpet Vine · flowering

A vigorous, deciduous climbing vine bearing clusters of soft yellow trumpet-shaped flowers in summer. Attaches via aerial rootlets and tolerates heat, drought, and poor soils once established. Attracts hummingbirds and butterflies. Fast-growing and tough, but needs firm support and regular pruning to prevent it taking over surrounding plants.

Cold limit: USDA 4-9 · RHS H6 (-20 to 38°C)

Watch for — Scale insects: Waxy brown scales may colonise stems, reducing vigour. Scrub off with a soft brush and apply horticultural oil in late winter before new growth starts.

What yellow trumpet creeper's hardiness rating actually means

Yes — yellow trumpet creeper is genuinely cold hardy. Rated RHS H6 and USDA 4-9, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H6 means: Hardy throughout the UK and northern Europe. On the US scale that maps to USDA 4-9 — 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 −20 to −15 °C. Yellow Trumpet Creeper is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for yellow trumpet creeper as it gets too cold:

It tolerates winter lows to about −20 to −15 °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 yellow trumpet creeper go outside or overwinter — and where?

Plant it out within USDA 4-9 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 yellow trumpet creeper can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Yellow Trumpet Creeper hardiness — frequently asked questions

Is yellow trumpet creeper cold hardy?

Yes — yellow trumpet creeper is genuinely cold hardy. Rated RHS H6 and USDA 4-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Yellow Trumpet Creeper is hardy across USDA 4-9; 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 yellow trumpet creeper can survive?

Minimum survivable temperature is roughly about −20 to −15 °C. Yellow Trumpet Creeper is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is yellow trumpet creeper?

Yellow Trumpet Creeper is rated USDA 4-9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can yellow trumpet creeper survive winter outside?

Plant it out within USDA 4-9 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 yellow trumpet creeper below its minimum temperature?

It tolerates winter lows to about −20 to −15 °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.