Mine are thrilled right now. Its 4 above, and even though it's dark out, theres enough light shining through the window of their coop into the run that several are out there playing chicken games. We went 12 days without getting above 0, so this is a treat to them. We had 3 nights in a row of -40 or colder, a couple in the -30s and the rest were at least -20. This is like spring. They still wanted to be in the run, even on the coldest days, but when it was cold, they waited for the sun to come up before venturing out.