Cold hardiness & minimum temperature

Is Eggplant / aubergine (Solanum melongena)cold hardy? Hardiness zone & min temp

Also called aubergine, brinjal, melongene.

About Eggplant / aubergine

Solanum melongena · also called aubergine, brinjal · edible

Eggplant (US) or aubergine (UK) is a warm-season Solanum grown for glossy fruit in purple, white, or striped. Needs heat — fruit set drops below 21°C. Start indoors early and grow in a greenhouse or sunny sheltered spot in cool climates. Foliage is toxic to pets.

Solanum melongena was domesticated in tropical Asia (India/Bangladesh and the surrounding region) from the wild S. insanum; it is a tender, frost-intolerant warm-season perennial grown as an annual.

Start seed about 8 weeks before transplanting; expect roughly 65–80 days from transplant (100–120+ days from seed) and harvest while skin is glossy and the flesh still firm — dull skin signals over-maturity and seediness.

Cold limit: USDA Grown as an annual in zones 5-12 · RHS H1c (greenhouse in UK) (21-29°C)

Watch for — Flowers drop without fruit: Too cold (<21°C) or too hot (>35°C); fruit set is temperature-sensitive.

Sources: extension.umn.edu, hgic.clemson.edu, frontiersin.org

What eggplant / aubergine's hardiness rating actually means

Hardiness works differently for eggplant / aubergine: it is grown as a seasonal crop, not overwintered. The question is not "what zone" but "how long is your frost-free growing window". 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 an annual in zones 5-12 — 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

As an annual crop, its "minimum temperature" is the first hard frost — that is the end of the plant's life, not a survivable low. Many types are also damaged by light frost (around 0 °C).

Concretely, for eggplant / aubergine as it gets too cold:

Light frost (around 0 to −2 °C) damages or kills tender summer crops outright; cold-hardy types take a few degrees of frost.
The plant does not "survive winter" — its life cycle simply ends, by design, when frost arrives or it finishes cropping.
A surprise late spring frost can also kill young transplants set out too early, before the season even starts.

Can eggplant / aubergine go outside or overwinter — and where?

Time it to your frost dates: sow or plant out after the last spring frost, and aim to harvest before the first autumn frost.
In short-season zones, start it indoors or under cover to stretch the effective growing window.
Hardier crops in this group can be sown for an autumn or overwintered harvest in mild zones — check the specific crop.

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 eggplant / aubergine can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Frost protection for borderline eggplant / aubergine

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

Use fleece, cloches or a cold frame at each end of the season to dodge a borderline frost and add growing weeks.
Have row cover ready for an unexpected late spring or early autumn frost.
Know your local last- and first-frost dates and count back the crop’s days-to-maturity to schedule the sowing.

Eggplant / aubergine hardiness — frequently asked questions

Is eggplant / aubergine cold hardy?

Hardiness works differently for eggplant / aubergine: it is grown as a seasonal crop, not overwintered. The question is not "what zone" but "how long is your frost-free growing window". A seasonal crop, not a perennial. Eggplant / aubergine is grown Grown as an annual in zones 5-12; you sow after the last frost and harvest before the first one, then start again next year.

What is the minimum temperature eggplant / aubergine can survive?

As an annual crop, its "minimum temperature" is the first hard frost — that is the end of the plant's life, not a survivable low. Many types are also damaged by light frost (around 0 °C).

What hardiness zone is eggplant / aubergine?

Eggplant / aubergine is rated USDA Grown as an annual in zones 5-12 and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can eggplant / aubergine survive winter outside?

Time it to your frost dates: sow or plant out after the last spring frost, and aim to harvest before the first autumn frost. In short-season zones, start it indoors or under cover to stretch the effective growing window. Hardier crops in this group can be sown for an autumn or overwintered harvest in mild zones — check the specific crop.

How do I protect eggplant / aubergine from frost?

Use fleece, cloches or a cold frame at each end of the season to dodge a borderline frost and add growing weeks. Have row cover ready for an unexpected late spring or early autumn frost. Know your local last- and first-frost dates and count back the crop’s days-to-maturity to schedule the sowing.