2008-09: Mackenzie Skapski played goal for the Abbotsford Hawks bantam team – which won a British Columbia provincial championship. He was selected by Kootenay in the third round (57th overall) of the 209 WHL Bantam Draft.
2009-10: Skapski played nine games for the Fraser Valley Bruins midget minor team in British Columbia. He was 4-3 with a 3.39 goals against. He suffered serious facial injuries when the team's bus was involved in an accident in December 2009 and Skapski spent the rest of the season recovering.
2010-11: Skapski made a successful return from his injuries – appearing in four games with the WHL champion Kootenay Ice and representing Canada Pacific in the 2011 U17 World Hockey Challenge. He made his WHL debut with the Ice in late January and was 3-1 with a 3.16 goals against and .882 save percentage. He did not play in any playoff games or at the Memorial Cup. In four games at the WHC he had a 3.30 goals against and a .878 save percentage. Skapski spent the bulk of the season with the Ridge Meadow Flames in the Pacific Junior Ice Hockey League. He was 6-11 with 1 shutout in 21 games and had a 4.56 goals against and .890 save percentage.
2011-12: Skapski appeared in 19 games as a backup to Sabres' prospect Nathan Lieuwen in his first full WHL season. He was 9-6-2 with a 3.12 goals against and .890 save percentage. Kootenay reached the playoffs after finishing fourth in the Central Division. Skapski did not see any action in the four-game playoff series with Edmonton. He was ranked 19th amongst North American goaltenders in Central Scouting's final rankings but was not selected in the 2012 NHL Draft.
2012-13: Skapski took over as the starter in his second full season with Kootenay, appearing in 65 of 72 games. He was 34-25-1 with 7 shutouts and had a 2.78 goals against and .910 save percentage. Kootenay reached the WHL playoffs after finishing fifth in the Central Division. The Ice met Edmonton in the playoffs for the second straight year and in the five game series Skapski was 1-4 with a 3.95 goals against and .892 save percentage. Ranked 17th amongst North American goaltenders in Central Scouting's final rankings, he was selected by the Rangers in the sixth round (170th overall) of the 2013 NHL Draft.