I'm in south central Texas and my coop is small (8x16) because the birds stay outside most of the time. I do have a 50x50 chicken yard for them and a smaller 8x16 run planned but not completed. I have 49 six week olds and by the time they are 12 weeks I'll be down to around 35. It's a little tight but works great because the birds only come in to sleep, lay eggs and eat. I even keep their water outside (but not their food).