Cold hardiness & minimum temperature

Is Autumn Sage (Salvia greggii)cold hardy? Hardiness zone & min temp

Also called Autumn Sage, Cherry Sage, Red Chihuahuan Sage.

More about autumn sage

About Autumn Sage

Salvia greggii · also called Autumn Sage, Cherry Sage · flowering

Autumn sage is a compact, bushy evergreen sub-shrub native to the Chihuahuan Desert regions of Texas and northeastern Mexico, where it grows on rocky limestone slopes and canyon walls. It produces masses of small tubular flowers from late spring right through to the first frost in shades of red, pink, coral, white, or purple, offering one of the longest bloom seasons of any hardy salvia. Once established it is highly drought-tolerant and thrives in hot, sunny positions with excellent drainage. The Salvia genus is listed as non-toxic to cats, dogs, and horses by the ASPCA.

Cold limit: USDA 7-9 · RHS H4 (-10 to 40°C)

What autumn sage's hardiness rating actually means

Yes — autumn sage is genuinely cold hardy. Rated RHS H4 and USDA 7-9, 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 7-9 — 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 −10 to −5 °C. Autumn Sage is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for autumn sage 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 autumn sage go outside or overwinter — and where?

Plant it out within USDA 7-9 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 autumn sage 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 autumn sage

Autumn Sage 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.

Autumn Sage hardiness — frequently asked questions

Is autumn sage cold hardy?

Yes — autumn sage is genuinely cold hardy. Rated RHS H4 and USDA 7-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Autumn Sage is hardy across USDA 7-9; 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 autumn sage can survive?

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

What hardiness zone is autumn sage?

Autumn Sage is rated USDA 7-9 and RHS H4 — Hardy in an average winter across much of the temperate world.

Can autumn sage survive winter outside?

Plant it out within USDA 7-9 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.

How do I protect autumn sage 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.