Alan,
I live near Bennington, the southern tip of Vermont. My son lives in Burlington, and I've promised him some cuttings.
All ten of my trees were overwintered last year in my cold cellar. I brought them into the cellar in October, after they went dormant, and put them in the coolest part of the cellar. It stays between 35-40 deg F all winter. I brought them out in early April, gave them a good drink of water, and they had leaf buds in a week.
I haven't had any problems so far, except that the cuttings I made last summer didn't survive the winter. I think the root system was not large enough to carry them through dormancy.
I have, Atreano, Sal's #1, Marseilles VS black, Triana, blk Paridiso, Violette de Bordeaux and Brown Turkey.