Thanks Rick, for your questions about Kathryn Morley. I grow it in a raised bed in our front yard with quite a few of the Austins and Buck roses and it is hardy here. Initially, it was planted deep and for the first several years, I throw on some extra soil around the plant but it has never died all the way down. The roses in that bed are supported by a series of very tall trellises and this one grows to about 6 ft. I have a couple of Golden Celebration growing next to KM and they are a little taller. Good rebloom and very large flowers. GC is a better rebloomer though. Austins here all have quick rebound in the spring. Zone 4b where you live will be more of a challenge both in hardiness and in spring growth. Give them some winter protection and you should be fine. You will love it! Good luck, Rick, with Kathryn Morley, she is a beauty!
Jan