2009-10: Tim Harrison assumed a full-time role as a sophomore at Massachusetts' Duxbury High School after appearing in a few games as a freshman. He also played for the Bay State Breakers bantam team.
2010-11: Harrison skated for Duxbury High as a junior as the Green Dragons reached the post-season for the first time since 2007-08. Duxbury scored upset wins in its first two playoff games before falling to Springfield Cathedral in the Division 1 South sectional semifinals.
2011-12: Harrison transferred to the Dexter School in Brookline, Massachusetts, repeating his junior year. He skated in 21 games, scoring 13 goals with 13 assists. Dexter reached the finals of the New England Prep School Ice Hockey Association small division, falling to eventual champion Kimball Union. Harrrison participated in the Road to College Showcase at Babson College in June.
2012-13: Harrison skated on one of the top lines in New England Prep School hockey in his senior season at Dexter. Playing alongside Trevor Fidler (Harvard recruit) and sophomore Ryan Donato, he scored 21 goals with 22 assists in 28 games. Dexter participated in the Stuart/Corkery Tournament for the top prep school's in New England, falling to eventual runner -up Kent in the quarterfinals. Harrison committed to playing college hockey at Colgate in 2013-14. In his second year of draft eligibility, he was not among the 2010 North American skaters in Central Scouting's final rankings when he was selected by Calgary in the sixth round (157th overall) of the 2013 NHL Draft.
Harrison is a big power forward that has quick hands, a high hockey IQ, and a large frame to play the physical game. He will have to continue to work on his skating and speed in order to fully utilize his size and skills. The 6’3, 175-pound forward will continue to grow physically and mentally as a player as he enters his first year at Colgate. Harrison recorded 51 points in only 28 games as a senior at Dexter Prep and will attempt to replicate similar production as a college player.
Harrison will be entering his freshman season at Colgate College as the 2013-14 season kicks off. After compiling 77 points in 49 games in his last two seasons at Dexter Prep, Harrison will be monitored closely to determine if he can continue his impressive offensive production at the collegiate level. The 19-year-old will have a few seasons in front of him to work on developing and maturing as a player before he bids for a position as a pro.