2006-07: This marked Kieran Millan’s first season with Spruce Grove (AJHL). As a rookie, he appeared in 60 games, claiming a 2.61 GAA and a .919 save percentage; he participated in the 2007 AJHL All-Star Game and the AJHL North All-Rookie Team for his efforts. Passed over in the 2007 and 2008 drafts.
2007-08: His second year with the club, the net-minder appeared in 55 games with the Spruce Grove Saints (AJHL); he posted a 3.04 GAA and a .903 save percentage.
2008-09: Millan spent the season with current NCAA Champs Boston University, and what a season it was. On top of winning the NCAA title, he was nominated to the H-East All-Rookie Team and was the leagues Rookie of the Year and got an All-Star Second Team nod for his efforts. Appearing in 33 games, he posted an impressive 1.85 goals against average and a .923 save percentage, personal best numbers. Expect more from this seasons New England Rookie of the Year in 2009-10.
2009-10: Millan started 32 of 38 games for Boston University as a sophomore. Despite struggling to stay above .500 for much of the year, the Terriers finished third in the tightly-packed Hockey East conference and Millan's numbers reflected the performance of his team. He finished 16-16 with one shutout and had a 3.15 GAA and .891 save percentage.
2010-11: Millan handled the bulk of the goaltending chores for Boston University for the third straight year; starting 35 of 39 games as a junior. The Terriers showed some improvement from the previous year record-wise, and again finished third in Hockey East, but were denied an NCAA playoff bid for the second consecutive season. Millan was 16-10-8 for the season with one shutout and a 2.68 GAA and .919 save percentage. He was named to the Hockey East Second All-Star team.
2011-12: Millan skated in 35 of 39 games for Boston University in his senior year. He was 20-14-1 with 3 shutouts and had a 2.60 goals against and .923 save percentage. The Terriers finished third in Hockey East. Millan started all five post-season games, including a pair of double overtime games against New Hampshire and the Hockey East semifinal game against Maine as well as Boston University's NCAA West Regional semifinal game against Minnesota. Millan signed an entry-level contract with the Avalanche in May 2012.
2012-13: Millan appeared in one game for Colorado AHL affiliate Lake Erie in his first pro season and combined with fellow Avalanche prospect Kent Patterson to lead the first-year Denver Cutthroats to the Central Hockey League playoffs. Millan stopped 22 shots in a 4-0 loss to Charlotte in his only game with the Monsters. In 38 games for eighth-place Denver he was 15-15-4 with 2 shutouts and had a 2.91 goals against and .913 save percentage. Millan played in four games during the five-game playoff series with first-place Allen and was 1-3 with a 2.99 goals against and .899 save percentage.
Millan has signed his first pro contract and will most likely start out in the AHL with the Lake Erie Lock Monsters.