Cold hardiness & minimum temperature

Is Orange Glow Firethorn (Pyracantha 'Orange Glow')cold hardy? Hardiness zone & min temp

Also called Orange Glow Firethorn, Orange Firethorn.

More about orange glow firethorn

About Orange Glow Firethorn

Pyracantha 'Orange Glow' · also called Orange Glow Firethorn, Orange Firethorn · flowering

One of the most popular firethorn cultivars, 'Orange Glow' is a vigorous evergreen shrub with masses of white flowers in spring and an outstanding display of long-lasting vivid orange-red berries from autumn through winter. An RHS Award of Garden Merit plant with reasonable scab resistance and strong wildlife value for berry-feeding birds.

Cold limit: USDA 6-9 · RHS H5 (-15 to 38°C)

What orange glow firethorn's hardiness rating actually means

Yes — orange glow firethorn is genuinely cold hardy. Rated RHS H5 and USDA 6-9, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H5 means: Hardy in most of the UK and in cold winters. On the US scale that maps to USDA 6-9 — 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 −15 to −10 °C. Orange Glow Firethorn is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for orange glow firethorn as it gets too cold:

It tolerates winter lows to about −15 to −10 °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 orange glow firethorn go outside or overwinter — and where?

Plant it out within USDA 6-9 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 orange glow firethorn can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Orange Glow Firethorn hardiness — frequently asked questions

Is orange glow firethorn cold hardy?

Yes — orange glow firethorn is genuinely cold hardy. Rated RHS H5 and USDA 6-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Orange Glow Firethorn is hardy across USDA 6-9; 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 orange glow firethorn can survive?

Minimum survivable temperature is roughly about −15 to −10 °C. Orange Glow Firethorn is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is orange glow firethorn?

Orange Glow Firethorn is rated USDA 6-9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can orange glow firethorn survive winter outside?

Plant it out within USDA 6-9 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 orange glow firethorn below its minimum temperature?

It tolerates winter lows to about −15 to −10 °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.