2009-10: Dillon Heatherington played for the Calgary Bronks bantam AAA team in Alberta. He scored 8 goals with 16 assists and had 34 penalty minutes in 32 games. Heatherington was selected by Swift Current in the first round (11th overall) of the 2010 WHL Bantam Draft.
2010-11: Heatherington played in his first WHL game as a 15-year-old, dressing for a January game with the Swift Current Broncos, and skated for the Calgary Flames Midget AAA team in the Alberta Midget Hockey League. He had no points or penalties in his appearance with the Broncos. In 31 regular season games for the Flames he had 11 assists and 44 penalty minutes and he had no points with 2 penalty minutes in four playoff games. Heatherington played for Team Alberta in the 2011 Canada Winter Games and had 4 assists with 2 penalty minutes in six games.
2011-12: Heatherington played in 57 games in his first WHL season on a defense group for Swift Current that included NHL draft picks Reece Scarlett (NJ) and Rchard Nedomlel (Det). He scored 2 goals with 8 assists and was plus-two with 63 penalty minutes. The Broncos missed the playoffs – finishing fifth in the East Division.
2012-13: Heatherington skated in 71 of 72 games for Swift Current in his second season and won a gold medal with Canada's U18 team at the 2013 World Junior Championship. He scored 4 goals with 23 assists and was plus-25 with 80 assists. The Broncos reached the WHL playoffs after finishing third in the East Division. Heatherington had 3 assists and was minus-two in the five game playoff series with Calgary. In seven games at the 2013 U18 WJC in Sochi he scored 1 goal and was plus-two with 4 penalty minutes. Canada defeated the USA, 3-2, in the gold medal game. Heatherington was ranked 31st amongst North American skaters in Central Scouting's final rankings prior to the 2013 NHL Draft.
Scouts like his size. Stay-at-home defender. Decent offensive awareness, but at his best in the defending zone. Has become a competent puck carrier.
Heatherington will return to Swift Current for his third season in the WHL. He was invited to try out at Canada’s WJC development camp. If he makes the squad, it could be monumental for the Calgary native’s young career.