In 2010, he started playing the main role of Thad Castle, the captain of a college football team, in Spike TV's "Blue Mountain State". He stayed on the show until it was cancelled after its third season in February 2012. He also appeared in number of television shows, including Hawaii Five-0. In 2015, Ritchson became a regular on the NBC variety show "I Can Do That" (based on Israeli variety show) alongside Nicole Scherzinger, Ciara, Joe Jonas, Cheryl Burke and Jeff Dye, and hosted by Marlon Wayans. In 2016, he appeared in "Nosedive", an episode of the anthology series "Black Mirror".