Larsen's first four professional years were spent almost entirely with Colorado's AHL affiliate, the Hershey Bears, before securing a full-time role as a member of the Avalanche in the 2001–02 season.

During the 2004–05 NHL lockout, Larsen made a return to full health playing in a career-high 75 games with the Thrashers AHL affiliate, the Chicago Wolves.

Upon resumption of the NHL in the 2005–06 season, Larsen established a checking line role with the Thrashers and posted a career-high 7 goals for 15 points.

After playing in an NHL-high 72 games and helping Atlanta reach their maiden postseason the following season, Larsen was re-signed by the Thrashers to a two-year contract extension on June 22, 2007.

[3] A free agent, Larsen was invited to the Buffalo Sabres training camp for the 2009–10 season, before signing with its AHL affiliate, the Portland Pirates on September 12, 2009.

Helping the Pirates reach the quarterfinals in the Calder Cup playoffs, Larsen later announced his retirement to become an assistant coach with the Springfield Falcons of the AHL on August 20, 2010.