They were hatched May 4th and I know I'm battling shorter/colder days. 2 of them look further along than my other two, in terms of comb size and color but I'm seeing no signs of them wanting to start laying (no squatting that I can tell). They have an 11x4 run that is mulched and I do leave them free range plenty unless they get naugthy and run into my neighbors evergreens lol. Perhaps they are just slow to mature and I'm impatient. Any ideas? Do I need to add grit? I tried giving them extra grit but they really didn't do much with it. I figured they must be getting enough when they are free ranging, but maybe I'm wrong. Thanks!