Cold hardiness & minimum temperature

Is Barbecue Rosemary (Salvia rosmarinus 'Barbecue')cold hardy? Hardiness zone & min temp

Also called Barbecue Rosemary.

More about barbecue rosemary

About Barbecue Rosemary

Salvia rosmarinus 'Barbecue' · also called Barbecue Rosemary · herb

Barbecue Rosemary is an upright rosemary cultivar bred for long, straight, sturdy stems that strip clean to make natural skewers for grilling. Aromatic and resinous, it is a sun-loving Mediterranean evergreen wanting sharp drainage and dry conditions, and it tolerates drought once established while resenting wet, heavy soil.

Cold limit: USDA 7-10 (evergreen perennial; protect in colder zones) · RHS H4 (15-29°C)

Watch for — Root rot: Wet, heavy soil rots the roots and yellows the plant. Use gritty, free-draining soil and water only when dry, especially in winter.

What barbecue rosemary's hardiness rating actually means

Yes — barbecue rosemary is genuinely cold hardy. Rated RHS H4 and USDA 7-10 (evergreen perennial; protect in colder zones), it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H4 means: Hardy in an average winter across much of the temperate world. On the US scale that maps to USDA 7-10 (evergreen perennial; protect in colder zones) — 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 to −5 °C. Barbecue Rosemary is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for barbecue rosemary as it gets too cold:

It tolerates winter lows to about −10 to −5 °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 barbecue rosemary go outside or overwinter — and where?

Plant it out within USDA 7-10 (evergreen perennial; protect in colder zones) 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 barbecue rosemary can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

Frost protection for borderline barbecue rosemary

Barbecue Rosemary is right on a hardiness edge in many gardens, so if you are pushing it, these measures buy it the margin it needs:

At the cold edge of its range, mulch the root zone in late autumn to buffer the deepest freezes.
Protect container specimens — pots freeze through far faster than open ground, costing roughly a zone of hardiness.
Shelter new growth from late spring frosts with fleece if a hard night is forecast.

Barbecue Rosemary hardiness — frequently asked questions

Is barbecue rosemary cold hardy?

Yes — barbecue rosemary is genuinely cold hardy. Rated RHS H4 and USDA 7-10 (evergreen perennial; protect in colder zones), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Barbecue Rosemary is hardy across USDA 7-10 (evergreen perennial; protect in colder zones); 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 barbecue rosemary can survive?

Minimum survivable temperature is roughly about −10 to −5 °C. Barbecue Rosemary is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is barbecue rosemary?

Barbecue Rosemary is rated USDA 7-10 (evergreen perennial; protect in colder zones) and RHS H4 — Hardy in an average winter across much of the temperate world.

Can barbecue rosemary survive winter outside?

Plant it out within USDA 7-10 (evergreen perennial; protect in colder zones) 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.

How do I protect barbecue rosemary from frost?

At the cold edge of its range, mulch the root zone in late autumn to buffer the deepest freezes. Protect container specimens — pots freeze through far faster than open ground, costing roughly a zone of hardiness. Shelter new growth from late spring frosts with fleece if a hard night is forecast.