I have seen a lot of talk about heating coops and wintering birds. I never really found any great information on how hardy specific breeds are. I know my Wyandottes are good to well below 0. Perhaps someone could post a list of breeds and their hardiness levels to help put others that are worried about their birds in the cold at ease or on alert I guess depending on breed. Thanks I have Welsummers, Black Australorps, Buff Orp. and BLRW. I would appreciate knowing if I need to worry about any of these breeds. We are in OK and 0 is about our lowest temp on avg.