Makar won the Stanley Cup with the Avalanche in 2022, winning the Conn Smythe Trophy as the most valuable player in the 2022 playoffs.

[6] As a 17-year-old, Makar established himself as a standout defenceman with the Bandits in 2015–16, logging 55 points in 54 games, en route to earning AJHL All-League and All-Rookie recognition.

[7] Makar sustained and built upon his previous success in the 2016–17 season to lead all defencemen and finished sixth among all skaters in the AJHL with 75 points (24 goals and 51 assists) in 54 games, collecting the league's MVP and top defenceman accolades.

[11] Despite his blue-chip prospect status, Makar opted to remain loyal to his commitment to joining the rebuilding UMass Minuteman program for the 2017–18 season.

[12] As a freshman, he immediately assumed a top-pairing role, alongside Jake McLaughlin, and recorded his first collegiate point in his debut against Arizona State University on October 6, 2017.

[13] While showing an adjustment period to the collegiate level, Makar raised his game through the new year to help the Minutemen to turnaround their program to make the post-season before suffering a 7–2 defeat to the hands of Northeastern University.

[16] That season, Makar became the first Minutemen honored as Hockey East Player of the Year after he led the league in scoring and finished second in the conference.

[17] Makar was also selected for the Hockey East First All-Star Team[18] and named a Hobey Baker Award finalist.

[22] He scored his first career NHL goal with his first shot in the league in his debut a day later, during Game 3 of the first round of the 2019 Stanley Cup playoffs against the Calgary Flames.

[25] On November 12, 2019, in a 4–0 road win against the Winnipeg Jets, Makar became the second Avalanche defenceman to record 18 points in 18 games as a rookie.

[29] As a result of his play, he was named a Calder Memorial Trophy finalist alongside Quinn Hughes and Dominik Kubalík.

[30] During the second round of the NHL playoffs, Makar surpassed the record for most points in a postseason by a rookie defenceman, before it was beaten by Hughes the following night.

[39] The Avalanche finished first in the Western Conference, and second in the league overall, advancing into the 2022 Stanley Cup playoffs to meet the Nashville Predators in the first round.

"[40] He would amass a further 19 points in the next three rounds, as the Avalanche ousted the Blues and the Edmonton Oilers before defeating the two-time and defending champion Tampa Bay Lightning in the Cup Finals.

[48] During Game 4 of the first round of the 2023 Stanley Cup playoffs, Makar was involved in a controversial on-ice incident after delivering what many deemed to be a hard, late hit into the boards on Seattle Kraken forward Jared McCann.

The officials initially appeared to assess Makar for a five-minute major penalty; he ultimately received a two-minute interference call.

[51] On March 6, 2024, Makar recorded his first career NHL hat trick in a 7–2 victory over the Detroit Red Wings; becoming the first Avalanche defenseman to do so since Sandis Ozoliņš back on December 6, 1999.

Makar finished the tournament leading all defenceman with three goals and eight points in seven games, and was the only Canadian named to the All-Tournament Team.

[56] Following the World Juniors, Makar reportedly turned down an invite to join the Canada senior team for the 2018 Winter Olympics to focus on his season at UMass, as he would have had to miss three weeks for the tournament.