Cold hardiness & minimum temperature

Is Cylindra Beet (Beta vulgaris subsp. vulgaris 'Cylindra')cold hardy? Hardiness zone & min temp

Also called Cylindra beet, Formanova beet, cylindrical beet.

More about cylindra beet

About Cylindra Beet

Beta vulgaris subsp. vulgaris 'Cylindra' · also called Cylindra beet, Formanova beet · edible

Cylindra is a Danish heirloom beet forming long cylindrical roots 15-20 cm (6-8 in) that yield uniform slices, maturing in about 55-60 days. This cool-season biennial grown as an annual needs full sun, deep loose soil, and steady moisture. Its elongated shape grows partly above ground, easing harvest and giving high slice counts.

Cold limit: USDA Cool-season crop for USDA zones 2-10; tolerant of light frost and sweetest in cool weather · RHS H4 (hardy through an average UK winter; sow spring to late summer) (10-24°C)

What cylindra beet's hardiness rating actually means

Hardiness works differently for cylindra beet: 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 H4 means: Hardy in an average winter across much of the temperate world. On the US scale that maps to USDA Cool-season crop for USDA zones 2-10; tolerant of light frost and sweetest in cool weather — 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 cylindra beet 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 cylindra beet 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 cylindra beet can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

Frost protection for borderline cylindra beet

Cylindra Beet 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.

Cylindra Beet hardiness — frequently asked questions

Is cylindra beet cold hardy?

Hardiness works differently for cylindra beet: 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. Cylindra Beet is grown as an annual in USDA Cool-season crop for USDA zones 2-10; tolerant of light frost and sweetest in cool weather; you sow after the last frost and harvest before the first one, then start again next year.

What is the minimum temperature cylindra beet 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 cylindra beet?

Cylindra Beet is rated USDA Cool-season crop for USDA zones 2-10; tolerant of light frost and sweetest in cool weather and RHS H4 — Hardy in an average winter across much of the temperate world.

Can cylindra beet 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 cylindra beet 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.