I was in USDA hardiness zone 4 when I had bees in the Panhandle of Nebraska and in Wyoming. Although I think Laramie should qualify for zone 3, being at 7200 feet up in the Rockies and the wind never stopped howling. I was fond of the Buckfasts and Carniolans, but I don't have a good source for Buckfasts anymore. If you can get some from Canada you can probably be assured of no AHB. Now I'm in zone 5 and I still like the darker bees better for colder climates.