at what age can a chick go outside? I am hatching out chicks and I know they usually feather out 8-10 weeks. But in 10 weeks we will be in December, will they be able to handle that weather at 10 weeks if feathered out? Of course heat lamp if below freezing. I live in Pennsylvania. I can't remember at what age I let my chicks out when I got them, but I also had them in the spring so had warmer weather. How cold is too cold at 10 weeks.