The MPSD offers an optional, FREE, half-day four-year-old kindergarten for children who will be age 4 on, or before, September 1st of the school year they are enrolling. 4K teachers are licensed by the state Department of Public Instruction to teach typically developing youngsters, children with delays, and those with advanced skills and abilities. 4K is offered in conjunction with supplementary childcare or as a stand-alone program.