Cold hardiness & minimum temperature

Is Rattlesnake Pole Bean (Phaseolus vulgaris 'Rattlesnake')cold hardy? Hardiness zone & min temp

Also called Rattlesnake pole bean, streaked snap bean, heirloom climbing bean.

More about rattlesnake pole bean

About Rattlesnake Pole Bean

Phaseolus vulgaris 'Rattlesnake' · also called Rattlesnake pole bean, streaked snap bean · edible

'Rattlesnake' is a vigorous heirloom pole bean with purple-streaked green pods on twining vines that climb 1.8-3 m. It thrives in full sun and warm soil, cropping heavily over a long season and tolerating heat and humidity better than most snap beans. Pick pods young for stringless snaps or leave to dry.

Cold limit: USDA Grown as a warm-season annual in zones 3-11 (frost-tender) · RHS H2 (18-30°C)

Watch for — Slow to germinate or rot: Cold, wet soil rots seed. Wait until soil is reliably above 16°C and not waterlogged before sowing.

What rattlesnake pole bean's hardiness rating actually means

Hardiness works differently for rattlesnake pole bean: 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 H2 means: Tender — survives a frost-free greenhouse or a very mild, sheltered spot. On the US scale that maps to USDA Grown as a warm-season annual in zones 3-11 (frost-tender) — 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 rattlesnake pole bean 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 rattlesnake pole bean 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 rattlesnake pole bean can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H2 figure above.

Frost protection for borderline rattlesnake pole bean

Rattlesnake Pole Bean 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.

Rattlesnake Pole Bean hardiness — frequently asked questions

Is rattlesnake pole bean cold hardy?

Hardiness works differently for rattlesnake pole bean: 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. Rattlesnake Pole Bean is grown Grown as a warm-season annual in zones 3-11 (frost-tender); you sow after the last frost and harvest before the first one, then start again next year.

What is the minimum temperature rattlesnake pole bean 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 rattlesnake pole bean?

Rattlesnake Pole Bean is rated USDA Grown as a warm-season annual in zones 3-11 (frost-tender) and RHS H2 — Tender — survives a frost-free greenhouse or a very mild, sheltered spot.

Can rattlesnake pole bean 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 rattlesnake pole bean 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.