This is my first winter with chickens. Is it nessessary to force chickens into coop at night? Low temps for the next week or two will be in the single digits, with a wind chill considerably below zero. I have three young (8 month), large (7lbs), cold-hardy chickens, (Barred Plymoth Rock). They only use their coop, which is insulated, to lay. I have spyed on them at night and they are roosting outside their coop in the pin on a med-sized branch placed 10ft off the ground. I feel that my chickens are too stupid to go inside their insulated, large (well ventilated), coop at night. Should I put them in their coop at night and close the exit, so they are warmer? or just let them be? Is their anyone with this same breed that could tell me what kind of low extreams they can withstand? Thanks!