I have overwintered a lot of my roses in pots in my shed, but it is against the house, and I still wrap the pots & plant in shrub protector/row cover, and pile my bagged leaves around them. I also make sure my bud union (which in a pot is not always buried deep) is covered with as much soil as I can mound without it falling off. This year, out of five roses, I lost my Julia Child (3 yrs old). She tried valiantly to grow in the spring, but eventually just faded away. I also store all my potted perennials and clematis in there, cut back, with bags of leaves on and over them. I also keep everything off the cold cement floor, raised on 2x4's or whatever I have handy. It works pretty well for me.
Judith

I'm also new and just ordered a miniature rose to pot,so, as to figure how to over-winter by trying a section I have under our front porch.

Here's a link that may help you out.

http://www.rosenut.com/rosecare/overwintering.htm

JIM

Great site, but I think it sounds like a bit of work to me. I think the easiest thing to do would be to find a place to plant in the ground lol!