Well, my girls officially grew out of their brooder. They were good sports though, even though it was cramped. We had toyed with the idea of simply getting a bigger box and using that for a couple of weeks. However, my girls mostly are feathered out nicely at just over three weeks. I had checked here first and found lots of threads about when to move them outside. Most say 2 weeks is a little young. 4 weeks seems to be fine, so it just depended on how cool our nights are. We're in the 50's at night, so we made the decision to take them outdoors. I did move the ecoglow out with them for a week or so until it warms up more and they have a chance to acclimate and grow more feathers. They genuinely seemed happy to be in the big house. And thanks to all those who were discussing when to move them... because it helped me to make the tough decision. I think it's harder on me than it is them. They love it!