When I gardened in zone 4/5 (NW WI) I knew of several folks who grew the pink Mary Rose.

I'm in zone 5. I grow a number of Austins and they do well.

In my no-spray garden setting they get blackspot and drop their leaves; they do well, however.

I especially like the pink Austins, but I also have some apricot and others.

I apply an even layer of mulch to the beds in the autumn, but don't do any other cover.

Austin's website lists about a dozen roses that do well in Zones 4 and 5. There are some lovely choices there. He also provides some advice on how to winter-protect your roses.

Hope that helps.

Kate

Here is a link that might be useful: Zones 4 and 5 Austin roses

Hi- My sister is in zone 3b and has kept Abraham Darby and Graham Thomas alive for several years. They don't get very big but are otherwise fine.
Bury the crowns deeply and try to keep them under snow cover in winter. A spot sheltered from nasty winter winds wouldn't hurt either.

I lived and gardened in zone 4 for over 20 years and have grown about 20 of David Austin's roses. Mary Rose was indeed the cane hardiest, sometimes requiring little pruning in spring. Others like Heritage, had to be cut back almost to the ground but would bounce back to 3 to 4 ft. tall and bloom like mad all summer. Really, the most important thing is to plant them deeply and keep them healthy. A healthy rose going into a severe winter can withstand so much more than a feeble, diseased rose. Of the varieties I have grown, only Molineaux died in its first winter for me, but I had heard it was more tender being a yellow, plus mine was a small own root plant. OTOH, Graham Thomas on its own roots has been hanging in there for me for 9 years now. I just moved it this summer to my new home in zone 5 and I'm hoping it is even happier here. It certainly bloomed like crazy since it got relocated. Of the more recent releases, Munstead Wood has been a real winner.