Already respected enough to serve on a competition committee regarding the adoption of goal nets and to be quoted as the preeminent authority on forward play by his linemate Arthur Farrell in his 1899 book, Trihey continued his high level of play in 1900, once again leading the Shamrocks to an easy league championship, while repeating his league scoring championship with 17 goals. His best match during the regular season came against the Victorias on January 18, when he scored five goals. The Shamrocks had two defenses of the Stanley Cup that season, the first a best-of-three match against the team from Winnipeg in February. Trihey led the Shamrocks in scoring with seven goals, scoring the game-winning goals in both of the Montreal victories. After the regular season was over, the Shamrocks made a second defense as champions of the Canadian Amateur Hockey League against the Halifax Crescents in March; Trihey added five more goals to his playoff total as Montreal overwhelmed the Maritimers in 10-2 and 11-0 victories, securing the Shamrocks' third and final Cup win.