And how cold does it get in the winter? And do you get a lot of snow? These two things can keep them inside for days on end if it's too much.
This can be caused by over crowding.
The northern area of.... The United Staes, Canada, Mexico, a certain state? It really helps us help you if you would at least give us the state you live in. FRIGID in Minnesota has a whole different meaning than Louisiana.
If it were my setup, I'd enclose the entire run, turning it into a...
Do you live where it snows much or gets cold in the winter (as in extended periods of below zero weather)? If so, you're going to want a bigger coop, not just more room in the run. I'm in MN, and my chickens will often spend weeks (sometimes months) indoors. The pop door is always open, but they...