Cold hardiness & minimum temperature

Is Daffodil (Narcissus)cold hardy? Hardiness zone & min temp

Also called narcissus, jonquil, paperwhite.

About Daffodil

Narcissus · also called narcissus, jonquil · flowering

Daffodils are spring-flowering bulbs that perennialise reliably and resist deer and squirrels because of toxic alkaloids. Plant in autumn for spring colour. Almost no maintenance once established. Toxic to pets — especially the bulb.

Daffodils are spring-flowering bulbs in the genus Narcissus (Amaryllidaceae), native chiefly to western Europe and the Mediterranean region, especially the Iberian Peninsula.

All parts are toxic to dogs, cats and horses, with the bulb the most poisonous; ASPCA attributes this to lycorine and other alkaloids, causing vomiting, salivation and diarrhea, and convulsions, low blood pressure, tremors and cardiac arrhythmias in large ingestions.

Cold limit: USDA 3-9 · RHS H6 (10-21°C)

Sources: aspca.org, aspca.org, plants.ces.ncsu.edu

What daffodil's hardiness rating actually means

Yes — daffodil is genuinely cold hardy. Rated RHS H6 and USDA 3-9, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H6 means: Hardy throughout the UK and northern Europe. On the US scale that maps to USDA 3-9 — 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

Minimum survivable temperature is roughly about −20 to −15 °C. Daffodil is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for daffodil as it gets too cold:

It tolerates winter lows to about −20 to −15 °C once established.
Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root.
First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.

Can daffodil go outside or overwinter — and where?

Plant it out within USDA 3-9 and it overwinters with little or no help.
It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy.
The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

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 daffodil can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Daffodil hardiness — frequently asked questions

Is daffodil cold hardy?

Yes — daffodil is genuinely cold hardy. Rated RHS H6 and USDA 3-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Daffodil is hardy across USDA 3-9; it belongs in the ground or a frost-proof container, not on a windowsill, and many types actively need a cold winter to perform.

What is the minimum temperature daffodil can survive?

Minimum survivable temperature is roughly about −20 to −15 °C. Daffodil is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is daffodil?

Daffodil is rated USDA 3-9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can daffodil survive winter outside?

Plant it out within USDA 3-9 and it overwinters with little or no help. It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy. The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

What happens to daffodil below its minimum temperature?

It tolerates winter lows to about −20 to −15 °C once established. Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root. First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.