Cold hardiness & minimum temperature

Is Coconut Thyme (Thymus praecox 'Coccineus')cold hardy? Hardiness zone & min temp

Also called Red Creeping Thyme, Coccineus Thyme.

More about coconut thyme

About Coconut Thyme

Thymus praecox 'Coccineus' · also called Red Creeping Thyme, Coccineus Thyme · herb

Coconut Thyme is a low, mat-forming creeping thyme grown for its dense evergreen carpet and magenta-crimson summer flowers that draw bees. It thrives in full sun and sharp-draining, lean soil, tolerates drought and foot traffic, and works as a fragrant lawn substitute or path filler. Aromatic foliage is edible but mild.

Cold limit: USDA 4-9 (hardy perennial groundcover) · RHS H5 (10-27°C)

Watch for — Root rot: Wet, heavy soil causes blackening and collapse. Improve drainage with grit and avoid overwatering, especially in winter.

What coconut thyme's hardiness rating actually means

Yes — coconut thyme is genuinely cold hardy. Rated RHS H5 and USDA 4-9 (hardy perennial groundcover), 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 4-9 (hardy perennial groundcover) — 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. Coconut Thyme is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for coconut thyme 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 coconut thyme go outside or overwinter — and where?

Plant it out within USDA 4-9 (hardy perennial groundcover) 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 coconut thyme can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Coconut Thyme hardiness — frequently asked questions

Is coconut thyme cold hardy?

Yes — coconut thyme is genuinely cold hardy. Rated RHS H5 and USDA 4-9 (hardy perennial groundcover), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Coconut Thyme is hardy across USDA 4-9 (hardy perennial groundcover); 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 coconut thyme can survive?

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

What hardiness zone is coconut thyme?

Coconut Thyme is rated USDA 4-9 (hardy perennial groundcover) and RHS H5 — Hardy in most of the UK and in cold winters.

Can coconut thyme survive winter outside?

Plant it out within USDA 4-9 (hardy perennial groundcover) 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 coconut thyme 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.