2009-10: Taylor Cammarata was a dominant scorer for the bantam team at Minnesota's Shattuck-St. Mary's School, finishing with 92 goals and 78 assists in 58 games. Shattuck-St. Mary's reached the USA Tier 1 U-14 semifinals and Cammarata scored 6 goals with 3 assists in five games at the national championships. He attended USA Hockey's Select 15 Player Development Camp in June.
2010-11: Cammarata was the leading scorer for a Shattuck-St. Mary's midget team that included the 2013 NHL Draft's first overall pick, Nathan MacKinnon. In 54 games he scored 71 goals with 68 assists and had 6 penalty minutes. Shattuck-St. Mary's reached the U16 national championship game, falling 3-2 to Detroit Honeybaked. Cammarata led all scorers at the national tournament with 7 goals and 7 assists in six games. He was selected by Waterloo with the first overall pick in the 2011 USHL Futures Draft.
2011-12: Cammarata continued his prolific scoring pace against bigger and older players in the USHL – leading Waterloo in goals and assists in his first USHL season. He scored 27 goals with 42 assists in 60 games and was +1 with 6 penalty minutes. Waterloo reached the Clark Cup finals after finishing third in the Western Division during the regular season. Cammarata scored 8 goals with 8 assists and was +4 with 6 penalty minutes in 15 playoff games. In November 2011 he committed to playing college hockey at Minnesota in 2013-14.
2012-13: Cammarata was the USHL's leading scorer in his second season with Waterloo – leading the league with 38 goals and finishing second in assists (55) behind teammate Justin Kloos (58). In addition to his 93 points he was a much-improved +39 with 49 penalty minutes in 59 games. Waterloo also participated in the pre-season World Junior Club Cup, reaching the championship game against the OHL's Sudbury Wolves. Cammarata scored 2 goals with 3 assists in six games. Waterloo was stunned by Fargo in the first round of the USHL playoffs, falling in overtime in the decisive fifth game. Cammarata scored 2 goals with 3 assists and was -1 in the series. He also represented the USA in international play, scoring 1 goal with 3 assists in four games at the 2012 U19 World Junior A Challenge. USA defeated Canada West, 6-3 in the gold medal game. Cammarata was ranked 193rd amongst North American skaters in Central Scouting's final rankings and was selected in the third round (76th overall) by the Islanders in the 2013 NHL Draft.