In 2021, in partnership with the Michigan Department of Education, our team launched the first study of Michigan’s TK program. Our broader aims are to: 1) describe variation in the implementation of TK across the state; 2) examine the fit of the program within the state’s early learning landscape, which includes state-funded pre-K (called the Great Start Readiness Project, GSRP), Head Start, family child care homes, and other center-based providers; and 3) estimate the impacts of attending TK on children’s later schooling outcomes. Here, we report on goal 1 – describing variation in the implementation of TK across the state. To do so, we analyzed state administrative data and surveyed administrators of TK programs to provide the first comprehensive description of which districts offer TK and what students experience in the program. (author abstract)