He competed at the collegiate level with the Grand Canyon Antelopes men's basketball team and finished his senior season averaging the most rebounds per game in all of NCAA Division I and was tied for third nationally with 21 double-doubles.
Shortly before April 2009, Larson was invited to participate in the Northwest Shootout, an event featuring the top high school senior talent from Oregon and Washington.
[3] Larson debuted with the Dominican men's basketball team at the collegiate level with 10 points, a team-high 9 rebounds and 2 blocks, and 1 assist in an exhibition contest vs. Pacific Union College.
Following the game, head coach Bret Tovani commented on Larson's debut, "I really liked the way the young guys stepped up tonight to the level of [collegiate] play.
[11] During the game, he converted on a three-point play with under one minute remaining in the final quarter, widely considered his most impactful offensive display in his first year.