I don't know. I read in one place that my chicks needed 95 degree temps when I got them and then to decrease by 5 degrees each week... and then I read elsewhere that they can withstand freezing at 5 weeks...?! So we're not expecting it to get below 57 degrees at night here (that's the very lowest in the week's forecast). My chicks are 3 weeks old. Can they go out into the coop? I have 9 of them.