I've got 6 chicks and live in Salt Lake City, UT. How warm does it need to be for me to let my chicks out into their new coop? I still have them in the garage and they're quickly outgrowing their box. We've had a bout of cold weather and snow here in Salt Lake this past week, but I'm wondering if the 70s/40s next week is warm enough for 7-week old chicks? Anyone else raising chicks here in the Salt Lake area? When are you letting your chicks outside for good...how old? Thank you.