Mine were 6 weeks and 8.5 weeks when I put them out...By day 10, they were on the bars. I had to put them on the first and second night, but they soon got the hang of it. Now they roost.Mine at almost 16 weeks are not roosting automatically yet. Prior to last week, they huddled. Now, each night, I am going out after they go into the coop by themselves and putting them on the roost. The first couple of nights, it was a battle of the wills...I put them up, they hop right down.. After a few nights and me waiting till it was slightly darker, I'm winning. I put them on the roost and they are still there in the morning. Next accomplishment will be that they get up there by themselves.