My DD14 and I sat through an information session for the University of Iowa's early entrance program: http://www2.education.uiowa.edu/belinblank/students/naase/

You do not need to be an Iowa resident. This program admits students as freshmen before they graduate HS and will try to work with the student's HS about meeting their graduation requirements so the student can still get his/her HS diploma.

Best of luck,
-S.F.

For gifted children, doing nothing is the wrong choice.