Okay, firstly I want to thank everyone on this website because there's no way we could have kept our flock alive without you. Now, our five oldest are 9 1/2 weeks, they will be 10 weeks on Monday. They are fully feathered and appear to be thriving in our garage, where we've built a grow out pen for them. Temps here have been fluctuating a lot, but this upcoming week our temps are stable at mid forties at night to mid sixties during the day. There's one day where the low is listed at thirty nine degrees, can they move out to the coop? We've had them out there on nicer days as much as possible and they love it. They do fine in our garage which is about fifty degrees all the time. Also, we have a prefab coop with built in boxes. Will it be bad if they go in there? We don't exactly have a way to block them. Thanks!