To many to list, but you could try googling cold hardy chicken breeds to see a full selection. Personally I own Anocna, Andalusian, Barred Rock, Silkies, Cochins, Red sex link, Easter Egger, and Lakenvelders and all have done well in Wisconsin with -25 F temps.
Thanks alot guys cant wait to fill it up with some cute little guys! I was curious about the hardy breeds because i am not going to have a heat source in the coop once they are older. We have hot summers and mild cold winters but it drops to about 20 F at the coldest nights here in northern virginia