In a word, don't. These grafted specimen types often succumb to Winter damage just like many roses do in colder climates, and you can easily lose everything above the snow line. IE: you get nothing next Spring except the stem of understock.

On the other hand, if you are willing to jump through a few cultural hoops, you can dig one side of the root ball loose and lay the plant, top to bottom, in a shallow trench in late Fall and bury it for Winter protection. Not worth the extra work, IMO, but thats your call.

I found that our back yard is too wet for the Minnesota tip method--putting it in a trench. But, I did overwinter some bare root roses in the stairway to our basement--it is about the right temperature. But, you can lose the plants if field mice get to them--they love to eat roses in the winter. Out in the field roses are protected by predators like hawks and owls.

I vote do not waste your money on tree roses in your zone.

I forgot: Polar Joy Tree rose may be ok in your zone. As far as I know, that's the only one.
Polar Joy is sold as a unique standard/rose tree that is the same hardy rose from top to bottom.
See link below:

Here is a link that might be useful: Polar Joy

Hi, I grow a tree rose here in zone 5, but I grow it in a pot and store it in my unheated garage over the winter. I cover the upper graft with bubble wrap. It's made it through 3 winters beautifully, and blooms off and on all summer (David Austin's Scepter d Isle). Tree roses have a formal look about them and growing them in pots enhances that look.

I'm with Karen. I bought Belinda's Dream last summer in tree rose form very inexpensively, fairly late in the season. It was $13 at HD so I figured if I lost it I would not be out something like $50. I grow it in a pot and it stays in the unheated garage over the winter.

I enjoy it immensely. However, I would not want more than one. That thing is HEAVY to move into the garage. Thank goodness for my Husband; I could not move the thing.

Unless you're really dedicated, tree roses in cold winter growing zones are a lot of trouble. Except for Polar Joy, it should be against the law to sell tree roses in cold winter growing zones. Most often they end up being expensive annuals.

Hi Valtorrez, I have to respectfully disagree with trospero. Even though to my recollection trospero is a name that has come up again and again in my quest for the perfect purple rose. Thank you for the information trospero.

I believe the twice a year digging is worth it. I live in zone 4a and have a burgundy iceberg standard. I also bury 20+ other roses. If I can do it, you can too. One would be a piece of cake.

Whatever you decide I wish you the best of luck,
Kitty

life is too short. Don't. They aren't hardy here, and I don't have the time or energ to haul heavy pots in and out of the garage.

Thanks everybody, I will not purchase. I like low maintence plants that I can weed or prune and be done with. I do not have a garage nor do I pot any of my outside plants besides annuals that get throw away at the end of year.