I think most would wait til nights are 70 or above and they are fully feathered - 5-6 weeks old. but if they are your only chickens, you could move them out in a secured coop. Why don't you monitor the inside the coop temps to see maybe it does stay at least in the high 60's at night...
Topic of the Week - Integrating Chicks into an Adult Flock
The above is a discussion from last year with loads of experienced help with how to add to your flock. Link didn't work, but you can copy and paste in the search to find it.
Then they are already outside ;)
So likely the transition to the coop will not be an issue?
But, to clarify the question - do you mean move to their forever home or want to let them free range alone?
:frow Hi from a fellow Georgian:
No, they can go out when they have feathered up - 5-6 weeks - No supplemental heat should be needed here in GA.
I can't imagine how to keep them inside til 10 weeks old :eek: