I'm going back and forth as to when I'm going to put my chicks outside. I have 6 black star chicks. They'll be 4 weeks old on Monday. They haven't had a heat lamp on them for a little more than a week and they're fine. They're almost all feathered out. My hubby made me a nice chicken tractor for them to stay in until they get big enough to go in with the 8 hens we already have. I think they'll outgrow their brooder in 3 weeks or less and it's getting to be a hassle to keep them in the basement as they get bigger. P.S. I'm in northern Michigan.