2010-11: Adam Helewka appeared in one game with the Notre Dame Argos midget AAA team as a 15-year-old, with no points or penalties, and played for the Argos South Saskatchewan minor hockey league squad. He scored 37 goals with 29 assists in 49 games.
2011-12: Helewka returned home to skate for the Vancouver NW Giants midget team in the British Columbia Midget Major League. He scored 24 goals with 29 assists and 74 penalty minutes in 40 regular season games and had 5 goals with 4 assists in five games during the BCMML playoffs.
2012-13: Helewka attended the Spokane Chiefs' tryout camp as a free agent and skated in 60 of 72 regular season games for the WHL club. He scored 10 goals with 17 assists and was +5 with 12 penalty minutes. The Chiefs finished second in the U.S. Division and reached the second round in the playoffs. Helewka scored 1 goal with 2 assists and was -1 with 2 penalty minutes in nine playoff games.
2013-14: Helewka was Spokane's third-leading goal scorer, scoring 23 goals in 62 games, in his second season with the Chiefs. He had 27 assists and was an even plus/minus with 32 penalty minutes as Spokane finished fourth in the U.S. Division. The Chiefs were swept by Victoria in a first round series. Helewka was -5 and had no points with 4 penalty minutes in four playoff games. In his second year of draft eligibility, he was ranked 72nd amongst North American skaters in Central Scouting's final rankings prior to the 2014 NHL Draft.