Cold hardiness & minimum temperature

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

Also called Roma tomato, Roma VF, paste tomato.

More about roma tomato

About Roma Tomato

Solanum lycopersicum 'Roma' · also called Roma tomato, Roma VF · edible

'Roma' is a popular determinate paste tomato producing heavy crops of egg-shaped, meaty, low-seed fruit ideal for sauces, canning and drying. The bushy plants grow to around 0.9-1.2 m, set most of their fruit in a concentrated flush, and carry VF disease resistance. A warm-season annual needing full sun, steady warmth and consistent moisture.

Cold limit: USDA Grown as a warm-season annual (frost-tender; perennial only in zones 10-11) · RHS H1C (18-29°C)

What roma tomato's hardiness rating actually means

Roma 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 (frost-tender; perennial only in zones 10-11) — 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). Roma Tomato has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Roma Tomato hardiness — frequently asked questions

Is roma tomato cold hardy?

Roma 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. Roma Tomato can only live outside year-round in genuinely frost-free climates (roughly USDA Grown as a warm-season annual (frost-tender; perennial only in zones 10-11)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature roma tomato can survive?

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

What hardiness zone is roma tomato?

Roma Tomato is rated USDA Grown as a warm-season annual (frost-tender; perennial only in zones 10-11) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can roma 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 roma 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.