2008-09: Jason Kasdorf was a back-up goalie to Brett Gagnon on the Winnepeg Thrashers midget team that hosted Hockey Canada's Telus Cup. Kasdorf had one start in the six-game Telus Cup tournament, a memorable 4-1 win over Quebec champion Rousseau Sports du Laval-Bourassa in which he stopped 23 of 24 shots. The Thrashers finished fourth in the Telus Cup after falling to the Calgary Buffalos in the semis and Laval-Bourassa in the third place game.
2009-10: Kasdorf appeared in 39 games for the Portage Terriers of the Manitoba Junior Hockey League. He finished with a record of 19-10-5 with two shutouts and a 2.55 GAA and .911 save percentage.
2010-11: Kasdorf enjoyed a dream season with the Portage Terriers. After finishing second in the MJHL's Sher-Wood division during the regular season, the Terriers won the MJHL's playoff title and then defeated Saskatchewan champion La Ronge in an intense seven-game Anavet Cup series to earn a berth in the RBC Cup championship tournament. In 34 games during the regular season, Kasdorf was 24-10 with two shutouts and a 2.53 GAA and .912 save percentage. Kasdorf's numbers improved in the post season as he allowed just 22 goals in 16 games including the MJHL and Anavet playoffs. In three games at the RBC Cup, Kasdorf was 1-1 with a 3.69 GAA and .873 save percentage. Kasdorf represented the West in the CJHL Prospects Games in December. He was ranked 10th among North American goalies by Central Scouting and was selected by the Winnepeg Jets in the 6th round (157th overall) of the 2011 NHL Draft. He is committed to playing college hockey at RPI in 2012-13.
2011-12: Kasdorf played for the Des Moines Buccaneers in the USHL. Appearing in a team-high 33 games he was 10-16-5 with three shutouts and had a 3.43 goals against and .894 save percentage. The Buccaneers finished with the league's third worst record and missed the playoffs.
2012-13: Kasdorf emerged as the starter for RPI and was one of the top goalies in ECAC Hockey as a freshman. In 23 games he was 14-5-2 with 3 shutouts and had a 1.62 goals against and .935 save percentage. The surprising Engineers finished second in ECAC Hockey but did not receive a bid to the NCAA tournament after falling to seventh-place Brown in a first-round playoff series.
Kasdorf, a Winnipeg native, was a sentimental pick for the Jets in their first draft since re-locating from Atlanta and is the first player drafted from the Portage Terriers in 40 years (goalie Curt Ridley was selected by the Bruins in 1971). According to one MJHL coach, while Kasdorf was "a hometown pick for sure" he does have some talent and ideal size for a young goalie prospect.
Long-term Kasdorf will join Scott Diebold and projected RPI starter Bryce Merriam (who will be a senior in 2012-13) at RPI, whose head coach Seth Appert is a former goaltender and had established a reputation as one of the better goalie coaches in college hockey before becoming a head coach. While Kasdorf has the physical size and tools to be a successful pro goalie, until he plays top competition it is difficult to gauge his long-term potential.