Great to have you with us! We got 19 chicks back in early Aug. Four are barred rocks. Great place here to find all the answers you want. Check out the great articles and the awesome search bar.
I bet chicks in the winter time can be a bit challenging... I've only ever got them in spring and I'm ready for those fluff butts to get out of my house in about 2 weeks! I finally built a coop with a brooder space to make it easier. Your chicks should be fully feathered by now, if you just take a few precautions, I'm sure they would be fine outside as long as they're protected from drafts (and predators).