Senate Bill 6362 (2018) directed the Washington Office of Superintendent of Public Instruction (OSPI) to "define the duties and responsibilities that entail a 'school day' under the state's statutory program of basic education under RCW [Revised Code of Washington] 28A.150.220 and 28A.150.260." In August 2018, Superintendent of Public Instruction Chris Reykdal convened the School Day Task Force. The Task Force met three times over the summer and fall to carry out the assigned objectives. The Task Force reviewed international, national, and statewide research and data and explored various organizational structures around issues of equity, time, and learning. This report describes the work of the Task Force and concludes with three recommendations to the Legislature.