The lowest roost in my coop is about 3 feet off the ground. I had discovered my Barred Rock chicks could get up there but they continued to sleep in a pile in the corner. I had read several folks say it was 10-12 weeks before theirs had started using the roost. But when I went to close up the coop last night I peeked in and my seven week olds were up on the highest roost all bunched up together. Funny what we get excited over.