Unless they're particularly short/small varieties, most roses don't do too well in pots, though if planted in one deep enough, they do better, so a minimum of about 2 feet for the container and you might get away with it.

Yes, they have deep roots. Have you ever tried to dig one up to move it and only got a long thick stump out of the ground!! Only small cultivars will be happy for longer than a year or so. Also, they usually get infested with aphids unless well watered.

Not spring on our neck of the woods, even the low hills are covered in a hefty layer of snow.

thanks to all!