That's the problem - figuring out what behaviors indicate your chicken is too cold. When they're chicks, it's easy because they cheep pitifully and huddle. Maybe they'll do a similar huddling. Mine seem to like to stop and warm their feet up on my leg while they're out free ranging, and it's about 40 degrees, so they do seem to have a definite preference. I just spent half an hour with a lap full of chickens sunbathing on the front step. ;-)
When I was growing up, my parents had chickens who stayed in the unheated barn (with some cows and horses) all winter, so I know they can take the cold. But mine are my babies, so I'm more inclined to make sure they're comfortable and happy for the winter. If they're acting huddled together and reluctant to leave the group, I'll be adding a heat source.
When I was growing up, my parents had chickens who stayed in the unheated barn (with some cows and horses) all winter, so I know they can take the cold. But mine are my babies, so I'm more inclined to make sure they're comfortable and happy for the winter. If they're acting huddled together and reluctant to leave the group, I'll be adding a heat source.