I have pretty much the same question - when can I relocate my chicks from their inside brooder to their outside coop/run? We have four Rhode Island Reds who are about 3.5 weeks and as far as I can tell are pretty well feathered, not much of the fluffy down stuff any more. We live in Rhode Island and for the past week have had 85-95 degree weather during the day, so I have been bringing my ladies outside. Last week I started by taking them out for 2-3 hrs a day. The past few days however they have been out all day, from 8am-7pm and loving it! Their coop and run is completely predator proof so I feel safe. We have even let them out to free range (under close supervision) a few times throughout the day (about 10-15 mins at a time). Funny thing is, when we do let them out we keep the door open to the run and they always go back, I think it must be a security thing, they feel safe in their coop.
Now, when I bring the girls back inside at night they make a bit of a stink, they squawk and try to fly out of their brooder. Are my girls ready to make their outside coop their permanent home? Is it too soon?