2010-11: Steven Spinner skated for the Eden Prairie bantam A team that won the Minnesota state championship.
2011-12: Spinner was the second-leading scorer for Eden Prairie HS as a sophomore. In 25 games he scored 20 goals with 10 assists and 21 penalty minutes. The defending AA state champions, the Eagles lost to Robbinsdale Armstrong, 2-1, in the section 6AA quarterfinals. Spinner was selected by Muskegon in the seventh round (92nd overall) of the 2012 USHL Entry Draft.
2012-13: Spinner was the leading scorer for Eden Prairie in his junior season after skating for Team Southeast in the Upper Midwest Elite High School league in the fall. He scored 19 goals with 27 assists and 33 penalty minutes in 25 games. Spinner scored two goals with an assist in a 7-1 win over Holy Family in the Section 6AA quarterfinals and scored two goals in the Eagles' season-ending 5-3 loss to Benilde-St. Margaret's in the sectional semifinals. Spinner scored 11 goals with 15 assists and 28 penalty minutes in 23 games for Team Southeast . In November he committed to playing college hockey at Nebraska-Omaha in 2014-15.
2013-14: Spinner played three USHL games with Muskegon in November before returning to Eden Prairie for his senior season and finished the year with the Omaha Lancers after he and high school teammate Luc Snuggerud were traded from the Lumberjacks to Omaha in February. He also skated for Team Southeast in the UMEHSL prior to the high school season. He scored 2 goals with 1 assist and was +3 in his brief stint with Muskegon and was -2 with 2 assists and 14 penalty minutes in eight regular season games for Omaha. Spinner was -3 with no points or penalties in the Lancers four-game playoff series with Sioux City. He scored 23 goals with 27 assists and 46 penalty minutes in 31 games as Eden Prairie captured the Section 6AA title and finished third in the state in AA. In 23 games for Team Southeast he scored 10 goals with 16 assists and 28 penalty minutes. Spinner was ranked 96th amongst North American skaters in Central Scouting's final rankings prior to the 2014 NHL Draft.