In 2011, Garnes became an assistant secondary coach for the Denver Broncos.
The Broncos’ secondary in 2013 overcame numerous injuries to its personnel, including extended periods without 12-time Pro Bowl cornerback Champ Bailey and starting safety Rahim Moore. In their absence, cornerback Chris Harris Jr. became a steadying force on the outside, and second-year safety Duke Ihenacho emerged as a solid contributor in the defensive backfield.
He joined the Chicago Bears' coaching staff as an assistant secondary coach in 2015,[3] but was let go after the 2016 season.[4]
In 2019, he became a Sports Analyst on the nationally syndicated radio program, The Ryan Show FM.