I am amazed that my chicks have survived. They're still very small but have at least a set of feathers now. they run about with mum in 30 degree weather! At night it's worrisome, but I bring them in the house if it's going below 25 F. I can hardly believe they've survived this well -- certainly not prime conditions, but hardier than I ever believed. Maybe they get adapted to the cold? That said, I would never do it again, like the others here.