Mine were off the heatlamp at about 1 week of age, but they lived in the house. I can't remember how old they were when I booted them out, but they moved to a small (read tiny) coop in the back garden where I could keep an eye on them. They were fine. They were there, at a guess, at least 4 weeks. Now, they've moved into a bigger, more airy, and colder coop, and they're still only 8 weeks old! I forget how young they are. They look and act so grown up
