Cold hardiness & minimum temperature

Is Striped Roman Tomato (Solanum lycopersicum 'Striped Roman')cold hardy? Hardiness zone & min temp

Also called Striped Roman tomato, striped paste tomato.

More about striped roman tomato

About Striped Roman Tomato

Solanum lycopersicum 'Striped Roman' · also called Striped Roman tomato, striped paste tomato · edible

Striped Roman is an elongated red paste tomato flamed with orange-gold stripes, with meaty, low-juice flesh ideal for sauce and roasting. The indeterminate vines are productive but need support and a long warm season. Like every tomato, its leaves, stems and unripe fruit are toxic to cats and dogs.

Cold limit: USDA Grown as a warm-season annual in all zones · RHS H1c (18-29°C)

What striped roman tomato's hardiness rating actually means

Striped Roman Tomato is not cold hardy. It is a tropical houseplant that dies if it is left out through frost — there is no zone where it overwinters outdoors in a UK or cold-US climate. Its RHS rating of H1c means: Warm-temperate — can summer outdoors but must come in well before the first frost. On the US scale that maps to USDA Grown as a warm-season annual in all 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 5 °C (and never frost). Striped Roman Tomato has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for striped roman tomato as it gets too cold:

Below about about 5 °C, growth stalls and the leaves start to show cold stress — dark, water-soaked, or yellowing patches.
A single light frost blackens the foliage; a hard freeze kills the whole plant, roots included, and it does not recover.
Even a cold, draughty windowsill or an unheated porch in winter can be enough to damage it permanently.

Can striped roman tomato go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above 5 °C, in shade or dappled light, hardened off gradually.
Bring it back indoors well before the first autumn frost — do not wait for a frost warning, move it when nights drop toward 10-12 °C.
It will never overwinter outside in a temperate climate; the indoors is its winter home, full stop.

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 striped roman tomato can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Striped Roman Tomato hardiness — frequently asked questions

Is striped roman tomato cold hardy?

Striped Roman Tomato is not cold hardy. It is a tropical houseplant that dies if it is left out through frost — there is no zone where it overwinters outdoors in a UK or cold-US climate. Indoor-only in almost every home. Striped Roman Tomato can only live outside year-round in genuinely frost-free climates (roughly USDA Grown as a warm-season annual in all zones); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature striped roman tomato can survive?

Minimum survivable temperature is roughly about 5 °C (and never frost). Striped Roman Tomato has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is striped roman tomato?

Striped Roman Tomato is rated USDA Grown as a warm-season annual in all zones and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can striped roman tomato survive winter outside?

It can holiday outdoors in summer once nights are reliably above 5 °C, in shade or dappled light, hardened off gradually. Bring it back indoors well before the first autumn frost — do not wait for a frost warning, move it when nights drop toward 10-12 °C. It will never overwinter outside in a temperate climate; the indoors is its winter home, full stop.

What happens to striped roman tomato below its minimum temperature?

Below about about 5 °C, growth stalls and the leaves start to show cold stress — dark, water-soaked, or yellowing patches. A single light frost blackens the foliage; a hard freeze kills the whole plant, roots included, and it does not recover. Even a cold, draughty windowsill or an unheated porch in winter can be enough to damage it permanently.