It is my understanding that in Georgia you'd have to stay in private school until 2nd grade as well (ie, the kid HAS to be 6 to start 1st grade in public school). Unfortunately, many of the private schools in this area follow Georgia law, too.
This is the reason we opted NOT to have DS6 start private school. It basically wouldn't have mattered. I found the private schools almost more strict than public ones. There is a "law" (in the fine, fine, fine print) about whole grade acceleration once a child enters K. This is how DS was skipped to 1st this past year. I don't know what county you're in, but grade skipping is possible, just AFTER the child has entered the public school realm.
We were very lucky to have a K teacher who recognized DS6 was far beyond any Kindergartner in the school. It might've helped that she has taught all the grades from K-3 at one point in her career. We could never thank her enough for recognizing DS6 needed more than just K.
