Cold hardiness & minimum temperature

Is Urmia Tulip (Tulipa urumiensis)cold hardy? Hardiness zone & min temp

Also called Urmia tulip, Urumiensis tulip, Iran tulip.

More about urmia tulip

About Urmia Tulip

Tulipa urumiensis · also called Urmia tulip, Urumiensis tulip · flowering

Tulipa urumiensis is a small, multi-flowered species tulip from north-western Iran (near Lake Urmia), producing clusters of three to five star-shaped, lemon-yellow flowers with a green or bronze reverse to the petals in early to mid-spring. It naturalises readily in well-drained, sunny spots and is one of the easier species tulips to grow and keep in the garden from year to year. Sharp drainage and a dry summer rest are the non-negotiable requirements for long-term success. All parts are toxic to cats, dogs, and horses.

Cold limit: USDA 4-8 · RHS H5 (-20°C to 22°C)

What urmia tulip's hardiness rating actually means

Yes — urmia tulip is genuinely cold hardy. Rated RHS H5 and USDA 4-8, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H5 means: Hardy in most of the UK and in cold winters. On the US scale that maps to USDA 4-8 — 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 −15 to −10 °C. Urmia Tulip is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for urmia tulip as it gets too cold:

It tolerates winter lows to about −15 to −10 °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 urmia tulip go outside or overwinter — and where?

Plant it out within USDA 4-8 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 urmia tulip can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Urmia Tulip hardiness — frequently asked questions

Is urmia tulip cold hardy?

Yes — urmia tulip is genuinely cold hardy. Rated RHS H5 and USDA 4-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Urmia Tulip is hardy across USDA 4-8; 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 urmia tulip can survive?

Minimum survivable temperature is roughly about −15 to −10 °C. Urmia Tulip is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is urmia tulip?

Urmia Tulip is rated USDA 4-8 and RHS H5 — Hardy in most of the UK and in cold winters.

Can urmia tulip survive winter outside?

Plant it out within USDA 4-8 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 urmia tulip below its minimum temperature?

It tolerates winter lows to about −15 to −10 °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.