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-2 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 penalty minutes. The Broncos reached the WHL playoffs after finishing third in the East Division. Heatherington had 3 assists and was minus-2 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-2 with 4 penalty minutes. Canada defeated the USA, 3-2, in the gold medal game. Heatherington was ranked 31st amongst North American skaters in the Central Scouting final rankings and was selected by Columbus in the second round (50th overall) in the 2013 NHL Draft.
2013-14: Heatherington attended NHL camp with the Blue Jackets before returning to Swift Current for his third season with the Broncos. Playing in 70 of 72 regular season games, he scored 6 goals with 29 assists and was plus-24 with 63 penalty minutes. Swift Current finished second in the East Division and lost to Medicine Hat in a first round playoff series. Heatherington had 1 assist and was minus-6 with 8 penalty minutes in six playoff games.
Heatherington is a quality shut down defender that uses his long frame to knock players off of the puck. While his offensive upside is limited, he consistently makes quality breakout passes out of his own zone. He plays a steady defensive game and will rarely be caught out of position. Heatherington is reliable as a penalty killer.
Heatherington skated for the Columbus entry in the Traverse City rookie tournament and attended training camp with the Blue Jackets before being returned to Swift Current for the 2014-15 season. Now in his fourth WHL season, he skated for Team WHL in the Subway Series against Russia and is a candidate for the Canada U20 team at the 2015 World Juniors. Dominant at the junior level with his size and tenacious play, he projects to being a top-flight shutdown defender at the pro level should he continue to develop and round out his game.