 Following his CFL playing career, Allen became an assistant coach in 1968 at Simon Fraser University in Burnaby, B.C., Canada.Five years later, he was named co-coach of the team along with Bob DeJulius.After nine years at Simon Fraser, Allen returned to the U.S. in 1977 as the defensive coordinator at Montana under head coach Gene Carlson, followed by other assistant coaching positions with Eastern Washington and California.