9 month old chickens stopped going into coop and it's 19 degrees outside - HELP!?!

[ChickenCanoe]

I would be more concerned about predators outside than the cold. It gets almost as cold here as it does there. One of our meetup group members has a very nice coop and covered predator proof run with roosts in both. Her chickens use the coop for egg laying and feeding, otherwise they're outside. Last winter they never spent one night in the coop, opting to roost in the run with no protection from the weather was the roof. They didn't freeze. No respiratory problems which I attribute to the fresh air.

 

[Lancaster KY]

Lock them in, Chickens are creatures of habit. What they do tonight they will do tomorrow night. Keep them in the coop for a few days or a week. I have noticed that in my own coop that when my brooder light is on my chickens will run in and out of the coop even after roost time but they will always end up on the roost before long. I did have to adjust the timer on my door to shut later when i was using the light.