Probably you don't need to worry. You could pile something around the small pots, not over the canes.

Sudden freezes, winter wind and endless rain are our problems. I have trenched and put the pots in the ground-I have excellent drainage..or when I am lazy(I always have a considerable pot Ghetto) I pack my pots close together and bank woodchips and leaves around them. I will lay some evergreen boughs over the most tender(who go into the center) if I am feeling energetic. This has worked fine for me. Last winter we had sudden very cold temps in November(4 degrees here)and everyone pulled through just fine including a few Noisettes.

patricia

I cluster any small pots against the house walls, especially on the west side where they're protected from wind and weather plus they benefit from the added warmth of the house. Everything survives with no problem.

Sue

Unheated garage works fine here. Or yes, the west side of the house. I have a tender noisette actually finally growing up the side of my house on the west side. We will see how it fares over the winter depending on what Mother Nature has in store for us here. :)

Marleah

I do everything that has been mentioned here. I put them on the west side of our shop, grouping the pots close together. When I know there's a real cold-snap coming, I protect with evergreen boughs. I've even had young rooted cuttings make it this way all winter without problems. Good luck to you!
Adrienne

I collect fall leaves and other reasonably clean, compostable garden debris (black spot free, of course) during the year. In late November, all the container plants are herded into a "depression" underneath our large cedar tree, where solid fences provide shelter from wind. I then pile the leaves over them. The containers come out in early spring. The leaves and garden debris are racked into a uniform pile, kept moist through the spring and summer, so that by the following fall, I have precious dark leaf mould as a bonus.

In a wet southern zone8 climate, at least, rain is a bigger threat than cold. It isn't consistently cold enough here to keep either roses or fungi dormant through the winter, so good air circulation is a must, along with good drainage. The one year I covered the tops with leaves I lost several rooted cuttings to mold.

Last year I didn't have many baby roses to over winter and just plunked the pots against a wall of my house. In previous years I clustered them together on my wind protected, south facing patio, smaller pots/tender cultivars in the center and larger pots/hardy cultivars around the edge. Then I raked leaves against the pots on the outside. I'm not sure any of that is really necessary. I have on occasion left un-loved potted roses completely unprotected out in the middle of the back yard, where they'd spent the summer, and they made it through the winter in good shape. I still can't bring myself to treat a valued baby that way, though.