2006-07: Jason Missiaen spent the season between the Peterborough Petes (OHL) and the Peterborough Stars (OPJHL). He had decent numbers with each club.
2007-08: Missiaen posted an 8-8-1 record with the Peterborough Petes (OHL). He also claimed a 3.28 GAA and a .911 save percentage. Missiaen was selected by the Canadiens in the fourth round (116th overall) of the 2011 NHL Draft.
2008-09: The net-minder spent the season with Peterborough (OHL), posting a 12-21-2 record with a 3.81 goals against average and a .904 save percentage, not his best numbers but it was a season that gave Missiaen more ice-time.
2009-10: Missiaen appeared in 59 games for Peterborough after taking over as the Petes' starter down the stretch the previous season. He was 27-32 with one shutout as the Petes finished third in the East Division and reached the playoffs despite finishing under .500. Missiaen faced over 2000 shots in the regular season and had a 3.68 GAA with a .901 save percentage. He was 0-4 during the playoffs, facing 147 shots, and had a 2.77 GAA with a .925 save percentage. The Canadiens declined to sign Missiaen, making him an unrestricted free agent.
2010-11: Missiaen played goal for the Blue Jackets at the 2010 Traverse City Prospects camp but was not offered a contract and joined Baie Comeau in the QMJHL as a 20-year-old. In 53 games for the Drakkar, who won just 12 games and had the league's second-worst record, he finished 10-41 with eight of those losses coming in overtime and recorded one shutout. Missiaen finished with a 3.33 GAA and .893 save percentage while facing over 1500 shots. The Rangers signed Missiaen to a three-year, entry-level contract in March 2011.
2011-12: Missiaen was the primary starter for the ECHL's Greenville Road Warriors in his first pro season. Backed up by Flyers' prospect Nicola Riopel, he was 22-16 with three of the losses coming in overtime and had 3 shutouts. Missiaen posted a 2.71 goals against and .916 save percentage as the Road Warriors finished second in the South Division. Missiaen played in one of three playoff games; stopping 29 of 33 shots in a 4-2 loss to Florida in Game Two. Greenville was swept by the Everblades.
2012-13: Missiaen was the backup goalie to Cam Talbot for the Rangers' AHL affiliate in Connecticut in his second pro season and also spent some time in the ECHL. In 25 games with the Whale he was 10-8-2 with 2 shutouts and had a 3.07 goals against and .906 save percentage. Connecticut missed the AHL playoffs by two points despite finishing second in the Northeast Division. Missiaen was loaned to ECHL Greenville in December and in five games with the Road Warrior was 4-1 with a 2.75 goals against and .922 save percentage. Missiaen was recalled by the Rangers during the NHL playoffs but did not see any action.
Missiaen is a very large athletic goaltender, with excellent lateral movement.