My chickens are a bunch of wimps when it comes to snow. It doesn't matter if it is a dusting or a few inches, they will not go out into the run after a snow. I just finished shoveling out my run and they literally flocked outside. Keep in mind it is cold, but the sun is shining in a perfectly clear sky. They don't seem to mind the cold and have been outside in below zero temps as long as there is no snow on the ground. Before I shoveled this morning I apparently had a bird fly out of the pop door land, turn around and fly back in. The marks in the snow showed wing marks but no foot tracks from the spot.