Cold hardiness & minimum temperature

Is Aji Amarillo Pepper (Capsicum baccatum 'Aji Amarillo')cold hardy? Hardiness zone & min temp

Also called aji amarillo, yellow Peruvian pepper, Peruvian hot pepper.

More about aji amarillo pepper

About Aji Amarillo Pepper

Capsicum baccatum 'Aji Amarillo' · also called aji amarillo, yellow Peruvian pepper · edible

Aji amarillo is a Peruvian Capsicum baccatum pepper with glossy orange-yellow pods, fruity flavour and medium heat (around 30,000-50,000 Scoville). A cornerstone of Peruvian cuisine, it needs a long, warm season. Started early indoors and grown on in full sun, the tall, productive plants ripen pods from green to vivid yellow-orange over a long harvest.

Cold limit: USDA Tender perennial grown as an annual; perennial only in zones 9-11, grown as an annual elsewhere · RHS H1c (21-29°C)

Watch for — Slow ripening / short season: Aji amarillo needs a long, hot season to colour up. Start seed indoors 8-10 weeks before last frost and grow in the warmest, sunniest spot or a greenhouse.

What aji amarillo pepper's hardiness rating actually means

Hardiness works differently for aji amarillo 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 Tender perennial grown as an annual; perennial only in zones 9-11, 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 aji amarillo 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 aji amarillo 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 aji amarillo 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 aji amarillo pepper

Aji Amarillo 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.

Aji Amarillo Pepper hardiness — frequently asked questions

Is aji amarillo pepper cold hardy?

Hardiness works differently for aji amarillo 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. Aji Amarillo Pepper is grown Tender perennial grown as an annual; perennial only in zones 9-11, 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 aji amarillo 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 aji amarillo pepper?

Aji Amarillo Pepper is rated USDA Tender perennial grown as an annual; perennial only in zones 9-11, grown as an annual elsewhere and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can aji amarillo 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 aji amarillo 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.