I am not sure that it makes any difference where you order from if the varieties you select are winter hardy in your zone. Chamblee's always sends good size 1-gallon plants that are healthy. It could be important though when you plant these roses so they have enough time to get established before the next winter in ND. So, in my humble opinion, as far as you order plants that are known to do well in your zone, you will be OK. ChambleeÂs roses are grown in greenhouses consequently if you get them early spring and in your climate you still can expect frosts or freezes, you better keep them in the garage and let them gradually accustomed to your North Dakota climate: taking the pots outside when it is relatively warm there, and transport them back to a protected area for the night, etc. etc.

Roses from southern suppliers, once acclimated to our climate, are OK if you chose a hardy variety.
Likewise tender roses from a northern supplier will not survive our winters without protection.
What I'm trying to say is it's the rose, not the place it comes from that determines it's hardiness.
True, Southern grown roses purchased and planted in cold zones in the fall, will more than likely not survive the winter because they've not had a chance to acclimate.
I use to buy roses in the south when I attended fall ARS conventions. Even by providing protection and growing in my unheated greenhouse, they failed to survive.
The same plants purchased from the same suppliers in the spring and grown here all season, did fine.
Where ever you buy them, choose hardy varieties and order them in the spring so they can properly acclimate.
Southern grown Buck roses should be fine if purchased and planted in your zone in the spring.
All I obtained were own root roses.
Keep in mind most all bare root roses are grown in California, Texas, and Arizona. Where ever you get bare root roses, most suppliers are middlemen all selling plants grown in similar locations. Exceptions are Hortico, Palentine, and Pickering who grow most of their stock.
I'm sure all but the hardiest roses require winter protection in your growing zone

I have to agree with what Karl Rosenut says as he speaks wisdom.
I live in northwest Missouri, zone 5/6 depending on which version of the map you look at.
Anyway, I order basically all my roses from Palatine, Pickering, Hortico, and most of all from Steve Singer at Wisconsin Roses. Everyplace north and colder than my area.
These four suppliers bud graft with R.Multiflora understock that for the most part really grow like crazy for me here. I kind of figure that if that understock can thrive/grow vigorously wild in their part of the world, they can grow in my milder climate here in the Midwest U.S.A.. I thought that was kind of logical to my sensibilities, and so far has proven right.
A few roses said to be winter tender that I grow I do protect with a newspaper collar and cotton burr compost/mulch stuffed inside. St. Patrick, Marilyn Monroe, Shiela's Perfume, and Imperatrice Farah are an example of what I protect as winter tender. I also protect any first year planted roses their first winter in my garden and I think that makes a difference to my winter survival rate, which is very good I think. I rarely lose a rose from a normal winter. After that, the roses are pretty much left to their own winter survival ways with just probably no more than 20 being protected by me as "tender" with the collars and mulch combo.
John
I did lose quite a few this past winter, spring actually, from the freak four day hard freeze at Easter week. All my roses had pretty much broken dormancy already and all that new growth was killed and some of the roses couldn't handle the stress. I lost 30 mini's and 25 big roses that couldn't handle the stress of losing all that new foliage growth. It was heartbreaking. Hopefully that was a very rare occurance that I won't see happen again. The rosarian at the nursery here in town said it was reportedly a once-in-a-hundred-year occurance. I hope he is right!!!

I order from Chamblee's, Countryside (MS.) and have no problems with roses surviving the winter as long as they are winter protected for at least the first year. As long as you are getting these fairly early in the growing season, you should be fine with just your regular winter protection methods. I would not buy these now though. Wait until next year.

Thank you all for your speedy responses. I do mulch my first year roses and any tender roses with peatmoss and soil combined. I also, am planning for my roses to be delivered in the Spring and appreciated hearing that I could venture into the more southern areas when purchasing roses without losing sleep over the winter months. ha ha. Thank goodness!

The roses seem to really like my clay soil. It's funny how gardening changes. When I first started gardening I started with roses. Of course I selected roses for beauty and not cold hardiness so they perished. I moved into peonies, iris and other perennials. After time, I got bored with these and began collecting conifers, then daylilies by the thousands, lilies, shrubs, clematis and now I am back to roses. Out of ALL these plants, I have to say roses are still my first love. When we had 10 days above 100+F this summer my roses never looked better, my daylilies began to slick/get mushy and my other perennials looked ratty and dry. My roses began blooming early this Spring and are still blooming while everything is winding down.

I will always have roses and now I do research to ensure the roses I purchase are hardy for my area. They are hardly any more work than any other perennial. I hate to see the season wind down. But next year will even be better and I can hardly wait to see next summers gardens. he he....