 After graduating from the University of Sioux Falls, DeBoer remained in the city of Sioux Falls, South Dakota as an assistant coach at Washington High School.After two years at Washington, DeBoer reunited with Bob Young and returned to his alma mater as offensive coordinator, a position he held from 2000 to 2004.Following Young's retirement, Sioux Falls promoted DeBoer to head coach on December 1, 2004.