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.
Very smooth skater and passer who needs to work on his defensive zone play. Possesses good size at 6'4 and will have plenty of time to develop in the NCAA (he does not have to sign a contract until August of 2017).
De Haas makes the move to the NCAA in 2013-14, as he will begin his freshman season with Clarkson University.