I only have 4 chickens right now and only my rooster is coming out at all. I opened the coop door yesterday and noticed that they were still roosting when I got home. The same thing happened today. I checked them over and they all are appearing healthy they just don't look like they want to come out. They came out with some coaxing tonight. They are about 6 months and haven't started laying yet. We have had a serious drop in temperature these last couple day but it warms up during the day.