Jim Blewett was a graduate of the Manual Arts School in Los Angeles. He played soccer until the school added football. After playing football at the University of California, he became head coach at Fresno High School in 1921. He coached the Warriors football, baseball, and basketball teams and his 1925 baseball team won the Valley Championship. He was then hired as the backfield coach for UCLA under Babe Horrell, but went back to coaching high school. His lifetime high school coaching record was 225-70-16. His teams won nine Los Angeles City Titles.