How cold does it get at night where you live? I have been putting my "teen" in the coop at night for about three weeks and they still want to sleep in the bush.
I have the same problem. Two older hens go in the coop at night and two "teens" just want to stay perched on the branches of a very overgrown bush in my yard. I have been waiting till it is dark and it is easy to pick them up and put them in the coop. I am also going to try the light idea. I...