You need to buy sub zero roses, cold climate roses, and explorer roses, if you are gardening in cold climate zones zones 5 and below.
In areas such as Canada interior, the Great Plains, the Midwest and the New England states it is a must to plant cold hardy roses.
You can buy subzero roses here. Just scroll down the page for all the subzero rose bushes for sale.
One thing to remember and understand that there are no cold climate hybrid tea roses, as tea roses are very cold tender, and will suffer from winterkill in cold winter region zones 5 or below.
Fortunately, truly cold hardy shrub roses and old garden roses can be grown without pampering in these region.
I recommend you plant only cold hardy, beautiful low maintenance roses for cold winter climates with sub zero temperatures.
Rugosa Roses are among the most cold hardy sub zero roses, hardy to zone 2, where winter temperatures can drop to -50F (-46C).
Explorer roses , which were developed in Canada, survive well without special winter protection in sub zero temperatures of that region.
William Baffin Rose, a wonderful climbing Explorer rose, is not only cold hardy, but it's also very disease resistant according to cold climate gardeners.
Carefree Beauty is another great rose to grow in any harsh sub zero climate rose garden.
It grows well in extreme cold and is also disease resistant, and it blooms nearly nonstop from June until frost.