2010-11: Jason Dickinson skated for the Halton Hurricanes midget AAA team, scoring 45 goals with 34 assists in 59 games. He was selected by Guelph in the second round (32nd overall) of the 2011 OHL Priority Draft.
2011-12: Dickinson skated in 63 games for Guelph in his first OHL season. He made steady progress through the season, finishing with 13 goals and 22 assists and was minus-15 with 24 penalty minutes. The Storm reached the playoffs after finishing fourth in the Midwest Division. Dickinson scored 3 goals with 2 assists in the six-game playoff series with Plymouth (one point behind Guelph's leading scorer Francis Menard) and was named to the OHL Second All-Rookie Team.
2012-13: Dickinson played in 66 of 68 games for Guelph in his second season. An assistant captain for the Storm, he scored 18 goals with 29 assists and was plus-11 with 69 penalty minutes. Guelph reached the playoffs after finishing fourth in the Midwest Division. Dickinson scored 1 goal with 1 assist and was an even plus/minus in the five game playoff series with Kitchener. Dickinson also played for the gold medal-winning Team Canada at the 2013 U18 World Junior Championship. In three games for Canada, he picked up 1 assist and posted a +3 rating. He was ranked 30th amongst North American skaters in Central Scouting's final rankings prior to the 2013 NHL Draft.