[2] Playing for the Storm in his rookie season in 2006–07, McCollum was named an All-Star, recording 5 shutouts, a 2.39 goals against average (GAA), and a .918 save percentage.

He posted similar numbers the following season, in 2007–08, including a 1.91 GAA, .937 save percentage performance in the playoffs as Guelph was ousted in the second round.

[4] McCollum put up a 13-8 record with a 2.90 GAA and a .898 save percentage in the playoffs, as Brampton lost to the Windsor Spitfires in the J. Ross Robertson Cup finals.

The Detroit Red Wings had McCollum split the 2009–10 season between the Toledo Walleye of the ECHL, and the Grand Rapids Griffins of the AHL.

On March 28, 2011, after injuries to Red Wings goalies Chris Osgood and Jimmy Howard, McCollum was called up from Toledo to serve as Detroit's backup.

After five AHL seasons, McCollum ranks third all time among Griffins goaltenders, trailing Joey MacDonald and Jimmy Howard in games played (159) and wins (69).

The Red Wings rallied to score four unanswered goals, and won the game by a final of 6–4, to earn McCollum his first career NHL win.

[8] On February 4, 2015, McCollum was assigned to the Grand Rapids Griffins, after appearing in two games for the Red Wings this season, where he posted a 0.91 goals-against average, and 0.960 save percentage.

Leaving as a free agent and later accepted a professional try-out contract to attend the Los Angeles Kings training camp on August 16, 2016.

As a free agent from the Red Wings, McCollum departed the club for a second time in agreeing to a one-year AHL contract with the Milwaukee Admirals, affiliate to the Nashville Predators, on July 17, 2018.

[19] As a free agent and leaving the Predators organization, McCollum agreed to a one-year AHL contract to add depth to the Hartford Wolf Pack, affiliate to the New York Rangers, on July 1, 2019.

As a free agent, McCollum opted to pursue a career in Europe, agreeing to a one-year deal with Austrian club, HC TWK Innsbruck of the ICE Hockey League on August 17, 2020.