State law contemplates, but does not require, four-year-old kindergarten (4K) programs in public schools. This issue brief discusses the various approaches to 4K programs that currently exist in Wisconsin, if a school board opts to provide a 4K programs. This issue brief also summarizes a recently-enacted program that, as an alternative to school-sponsored 4K programs, provides funds to child care providers for instructional programming to four-year-old children, if certain conditions are met.