After the war, Barnes served as an assistant football coach at the
University of Arkansas for four seasons. He moved west to UCLA in
1950 to serve as an assistant under head coach
Red Sanders. When Sanders died of a heart attack shortly before the
1958 season on August 14, fellow Bruins assistant
George W. Dickerson was promoted to head coach. Two weeks later on August 30, Dickerson was admitted to the
UCLA Medical Center with "
nervous exhaustion". Dickerson returned on September 11, and led the Bruins for three games as head coach, losing to #21
Pittsburgh on September 20, winning at
Illinois, then losing 14–0 at
Oregon State. On the night before the
Florida game, Dickerson was admitted to the UCLA Medical Center, again suffering from nervous exhaustion; Barnes was named acting head coach for the rest of the season. He remained through 1964 and guided his teams to a record. Barnes won two conference (AAWU) titles in
1959 and
1961, and led the sixteenth-ranked Bruins to the
Rose Bowl. Three of the assistant coaches from Sanders'
1954 national championship team later served as head coaches for the Bruins: Dickerson, Barnes, and
Tommy Prothro. Sanders and Prothro also were from Tennessee. After going in his last three seasons, Barnes resigned after the
1964 season after learning that athletic director
J. D. Morgan was not going to renew his contract. ==Later life and honors==