Cold hardiness & minimum temperature

Is Cayenne Pepper (Capsicum annuum 'Cayenne')cold hardy? Hardiness zone & min temp

Also called cayenne pepper, long red cayenne.

More about cayenne pepper

About Cayenne Pepper

Capsicum annuum 'Cayenne' · also called cayenne pepper, long red cayenne · edible

Cayenne is a reliable, productive Capsicum annuum bearing long, slender red chillies at roughly 30,000-50,000 Scoville heat units. It crops well in pots on a sunny patio, windowsill or greenhouse and dries easily for cayenne powder. Fruit ripens from green to red about 70-90 days after transplanting.

Cold limit: USDA 9-11 as a tender perennial; grown as an annual elsewhere · RHS H1c (18-30°C)

Watch for — Flower drop: Blossoms fall when temperatures swing too cold or hot, watering is erratic, or feed is too rich in nitrogen. Keep conditions steady and feed with high-potash fertiliser.

What cayenne pepper's hardiness rating actually means

Hardiness works differently for cayenne pepper: 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 9-11 as a tender perennial; grown as an annual elsewhere — 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 cayenne pepper 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 cayenne pepper 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 cayenne pepper 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 cayenne pepper

Cayenne Pepper 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.

Cayenne Pepper hardiness — frequently asked questions

Is cayenne pepper cold hardy?

Hardiness works differently for cayenne pepper: 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. Cayenne Pepper is grown 9-11 as a tender perennial; grown as an annual elsewhere; you sow after the last frost and harvest before the first one, then start again next year.

What is the minimum temperature cayenne pepper 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 cayenne pepper?

Cayenne Pepper is rated USDA 9-11 as a tender perennial; grown as an annual elsewhere and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can cayenne pepper 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 cayenne pepper 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.