Hahn received his B.A. in 1979 from Grove City College in Pennsylvania with a triple major of theology, philosophy, and economics (magna cum laude). He obtained his M.Div. (summa cum laude) from Gordon-Conwell Theological Seminary in 1982. In May 1995, he was awarded a Ph.D. in systematic theology from Marquette University (Phi Beta Kappa). His dissertation, entitled Kinship by Covenant: A Biblical Theological Analysis of Covenant Types and Texts in the Old and New Testaments, is a significant example of contemporary covenantal theology.