After retiring as a professional ball player, Kelso coached at Cooley High School for 14 years, leading the team to three state championships in 1987,1988, and 1989.
After retiring as a professional ball player, Kelso began coaching students at various schools. At Cooley High School, where he coached for 14 years, Kelso lead the team to three consecutive state championships in 1987,1988, and 1989.