I am building my brooder this week. Before building I am wondering how long I will need to keep baby chicks inside. When they could move to garage? When they could move to the coop? ( I have no other hens to contend with). I get the baby chicks May 18. When they are three weeks old the average weather for nights in my area is 53 degrees. I guess I'm not sure what kind of temporary brooder to build because I'm not sure how long I will need it.