This policy brief from the University of Michigan’s Education Policy Initiative draws on state administrative records and administrator surveys from districts that provide transitional kindergarten (TK) to describe program features. The researchers found that the majority of students in Michigan public schools are enrolled in a school district that offers a TK program, though districts that offer TK are more likely to be in suburbs and towns and to serve fewer students historically underserved by public education systems. Education administrators report that improving kindergarten readiness and providing a more structured learning experience before kindergarten were important factors in deciding to offer TK. The authors also found that some district leaders consider TK programs to be a way to attract and retain students and families.