They were 6 weeks. I agree with @FeatherPugs - their instincts will kick in and they will be roosting in no time. Mine didn't have any other chickens to learn from either, they just naturally wanted to go up to the highest part of the coop to sleep, which was the roost.@SonoranChick how old were they when you put them outside? I'm wondering when I should encourage them to roost for bed. They don't have any older chickens to learn from.