Hi, welcome to BYC! Where do you live? In SW MO, it was -1 F yesterday morning. I opened up like I always do. When the sun came out, the chickens came out too. We didn't have any snow, but even when there is, I clear areas for them in the run and lure them out with scratch feed.
Chickens have down jackets on, and mine have endured -20F. They didn't like it, but they survived, and the coop door was open every day. It's a big door too, walk in for humans.