2009-10: James de Haas played for the Mississauga Braves Minor Midget team. The Braves captured the GTHL’s Kraft Cup as the regular season’s best team and won the West Division playoff title. The Braves lost just one game all season, finishing 31-1-4 in the regular season and going 10-0-1 in the West Division playoffs.
2010-11: De Haas skated in 70 games for the Toronto Marlboros midget AAA team in the Greater Toronto Hockey League. He scored 12 goals with 18 assists and had 40 penalty minutes.
2011-12: De Haas played for the Toronto Lakeshore Patriots in the Ontario Junior A Hockey League .He was invited to the selection camp for the Canada East squad in the 2011 World Junior A Challenge but did not play in the tournament and committed to playing college hockey at Clarkson in 2013-14. In 45 games for Toronto Lakeshore he scored 10 goals with 19 assists and had 32 penalty minutes. The Patriots finished third in the South-East Conference’s South Division and reached the conference finals in the playoffs. In 21 playoff games De Haas scored 5 goals with 7 assists and had 10 penalty minutes. De Haas was selected in the 14th round (270th overall) of the 2012 OHL Priority Draft. Not among the 210 North American skaters in Central Scouting’s final rankings prior to the 2012 NHL Draft, he was selected by Detroit in the sixth round (170th overall).
2012-13: De Haas headed west to play for Pentiction in the BCHL and played for Canada West in the 2012 World Junior A Challenge. The second-leading scorer amongst defensemen for the Vees, he scored 5 goals with 19 assists in 53 games and had 19 penalty minutes. Penticton finished first in the Interior Division and reached the BCHL finals against Surrey. De Haas scored 3 goals with 6 assists and 8 penalty minutes in 15 playoff games. In four games at the WJAC he had 2 assists and 2 penalty minutes. Canada West captured the silver medal at the tournament; falling 6-3 to the USA in the gold medal game.
2013-14: De Haas skated in 38 of 42 games for Clarkson as a freshman. He scored 6 goals with 7 assists and was -12 with 18 penalty minutes. Clarkson finished tied with Yale for fifth-place in ECAC Hockey; sweeping Princeton in a first round series before losing 1-0 in overtime in the decisive third game of their quarterfinal series against Cornell.
2014-15: De Haas was the leading scorer amongst defensemen for Clarkson, seeing top pairing minutes for the Golden Knights as a sophomore. He scored 6 goals with 9 assists and was -3 with 18 penalty minutes in 36 games. Clarkson finished eighth in ECAC Hockey and was eliminated in the ECAC tournament first round, falling to RPI, 3-1, in the decisive third game of their best-of-three series.
2015-16: De Haas skated in all 38 games for Clarkson University in his junior season, the only Golden Knights player to do so. Frequently paired with Flyers’ prospect Terrance Amorosa late in the season, he scored 5 goals with 12 assists and was -1 with 26 penalty minutes. Clarkson finished tied with RPI for fifth in ECAC Hockey, sweeping Princeton in a preliminary series before falling to neighboring rival St. Lawrence in the quarterfinals. All four of the Golden Knights’ ECAC games went to overtime.
De Haas is a smooth skater and passer who continues to develop his defensive zone play. He is a big player and logs lots of minutes for Clarkson.
De Haas was once again a team leader for Clarkson University in 2015-16, seeing key minutes on the blueline as a junior. Somewhat out of the spotlight playing for the Golden Knights, de Haas projects as a solid two-way defender though he may need some time at the minor pro level after graduating.