Today in MN it was 32 and snowing like crazy. Thankfully I insulated the coop weeks ago and put two layers of 4mil clear plastic around the run. We have a black australorp, an Easter egger, green egger, silver laced cochin and my girl who's a salmon favorelle, all are about 6 months old. We also just tonight added our 12 week old prairie blue bell egger ( who was supposed to be a speckled sussex) and a rhode island red. I opened the run as the snow was really coming down and all our older girls would not come out, was funny. I took the australorp and put her out in the snow. She looked so puzzled and flew all the way back to the run, ha!