I know your post is old, and hopefully your chickens are no longer doing that, but for the sake of others having the same problem I wanted to reply. I have 13 assorted pullets, 8 weeks old. They have been out of the brooder and in the coop / run for about 2 weeks. Every single night, they would huddle up in a corner of the run facing the wall of the coop, like the lady in the final scene of The Blair Witch Project, if that means anything to you! Anyway, after herding them for 2 weeks into the coop every night, not easy, I read on here to turn on a light in the coop before dusk and that they would go in because they go to the lightest place, which before was the run because there is a halogen light on a nearby building. Today I did that, hung a 100 watt bulb, because that was what was handy, and when I went out at 6:30 the girls were ALL inside the coop! Hallelujah! I visited for a bit then said goodnite and turned off the light! Thank you Backyard Chickens!!!!