Kloppenburg began his coaching career as an assistant men's basketball coach at Feather River College. In 1984, Kloppenburg became head coach.[3] From 1988 to 1993, Kloppenburg was head women's basketball coach at Lassen Community College in Susanville, California, where he led the team to two consecutive California Community College Athletic Association titles in 1992 and 1993.[6] From 1993 to 1999, Kloppenburg was head men's basketball coach at Lassen.[6]
Kloppenburg improved the Shock during his two-year tenure; nevertheless, he was fired after the 2013 season.
In 2017, Kloppenburg became an assistant for the Seattle Storm. Kloppenburg served as interim head coach on August 10, 2017, after head coach Jenny Boucek was fired.[8] Kloppenburg stayed on the staff under new head coach Dan Hughes. In the 2019 season, Kloppenburg served as interim head coach during the time Hughes was recovering from cancer surgery. On June 29, 2020, Kloppenburg became head coach again after Hughes was determined to be at higher risk of illness from COVID-19.[9]