Our 7 week old chicks moved out to their outdoor coop this week and they sleep at night in the tractor which has hardware cloth sides. The pen is just sitting on the soil, and the tractor is inside the pen. Overnight temperatures are in the low 40's this week and Tweety is worried about them being cold. I'm under the impression that at this age they are sufficiently feathered to not worry about the current temperatures. I'm working on a larger enclosure they can live in for the winter, but I need to be certain that for the next few weeks this is not a big deal. Or is it... Could someone confirm or correct me please? On edit: We have a couple barred rocks, a couple buff oringtons, a RIR, an australorp, 3 silver laced wyandottes and a little white critter we call angel. Not sure what breed.