My 21 chicks are 4 & 6 weeks old and living out in the coop. Last night, I left them out in the enclosed run, with the coop door open. They come in/out of the coop easily. Well, while we were at the movies (Hunger Games), it started to rain. The silly chicks were cold, shivering, and soaked by the time we got home! I think they were afraid of the sound on roof. Lesson learned... They are still babies!