After retiring as a player, he became head coach at his alma mater, Simon Fraser University, in 1988. In 1995, when the Vancouver Grizzlies debuted, he became team Director of Community Relations and worked as the colour commentator for their radio broadcasts. In 1998, Triano became the head coach of the Canadian men's national basketball team. He led them to a 5–2 record and a seventh-place finish in the 2000 Sydney Olympics, losing to France by five points in the quarter-finals. Two years later, he became an assistant coach for the Toronto Raptors, becoming the second Canadian-born coach in the NBA. He served under Lenny Wilkens, Kevin O'Neill, and Sam Mitchell. In 2004, Triano was fired as national team head coach, and was replaced by Leo Rautins the following year. In 2008, Triano was named an assistant coach for United States national team. On February 13, 2008, Triano served as head coach of the Toronto Raptors in their 109–91 victory over the New Jersey Nets, in place of head coach Sam Mitchell, who was absent from the team as a result of the passing of his father-in-law, making history as the first Canadian to serve as head coach for a regular-season NBA game. On December 3, 2008, Triano was named interim head coach of the Raptors after Mitchell was relieved of his coaching duties. He became the first Canadian-born head coach in NBA history. Triano guided the Raptors to a 25–40 mark. On May 12, 2009, Triano was given a three-year deal to remain head coach of the Raptors. In Triano's first full season as the Raptors head coach in the 2009–10 season, Toronto missed the playoffs by one game to the Chicago Bulls, going 2–5 in their last 7 games. The team finished 40–42. In the 2010–11 season, without Chris Bosh on the roster, Triano led the Raptors to a dismal 22–60 record. On June 1, 2011, the Raptors announced they would not be picking up the option on Triano's contract, but gave him another position within the organization, the Vice-President of Pro Scouting. On August 17, 2012, Triano was named as an assistant coach for the Portland Trail Blazers. The following week, Triano was also named head coach of Canada's national team for the second time in his career. On May 18, 2016, it was announced that Triano would take on the associate head coach role for the Phoenix Suns. He was reunited with head coach Earl Watson, who played for the Trail Blazers during his final season in the NBA, and was considered a major influence on transitioning to being a full-time coach. The subsequent hiring of Turkish-born Mehmet Okur to the Suns' coaching staff as a player development coach on September 13 in the same year, marked the first time in franchise history that multiple non-American coaches served on the coaching staff in the same season. On October 22, 2017, after a 0–3 start to the season, including one of the worst losses in Suns history and the worst loss to open up a regular season in league history, Triano was promoted to interim head coach of the Suns after the firing of Earl Watson. In his first game as head coach since 2011, Triano managed to lead the team, which previously had 40+ point losses earlier in the year, to lead as high as 22 points at one point before winning 117–115 on October 23, against the Sacramento Kings for their first win of the season. On December 26, 2017, Triano became the first foreign born head coach in NBA history to win 100 games in the league with a 99–97 win over the Memphis Grizzlies. However, the Suns would finish the season with a 21–58 record under his tenure, and he would not return as head coach after that season. On May 24, 2018, the Charlotte Hornets announced that Triano would join their staff as lead assistant coach.
