A native of Corvallis who starred at Corvallis High School and for the Richey's Market American Legion program before playing at Mt. Hood CC and at Western Oregon, Clontz was a starter at several infield and outfield positions for the Knights in 2006, 2008 and 2009. He earned All-WCL honors for Knights' teams that advanced to the WCL Championship Series in 2008 and 2009.

Following his college career, Clontz joined a Knights' coaching staff that directed the club to a West Division regular-season title in 2010, and to a WCL championship in 2011. He also played and coached for the Morley Eagles in Australian baseball in 2011-12.