This bee colony chose to set up housekeeping on the bottom side of a tree limb in Athens, GA....last year. It overwintered and has already pitched at least one swarm this spring. Although our winters are mild compared to Maine's, they get cold nonetheless. We had several nights in the teens, countless in the twenties, blowing winds, rain and sleet. And this colony not only survived but thrived.

http://www.boogerhillbee.com/beetree1.jpg