2009-10: Tyrell Goulbourne, selected by Kelowna in the fifth round (105th overall) of the 2009 WHL Bantam Draft, made his major junior debut with the Rockets as a 15-year-old, appearing in five mid-season games. He had 1 assist and was -1 for Kelowna, which finished second in the B.C. Division. Goulbourne played 33 games, including two playoff games, for the CAC Edmonton Canadians midget AAA team and scored 13 goals with 13 assists and 87 penalty minutes.
2010-11: Goulbourne played 13 WHL games during the regular season, joining Kelowna three separate times during the season, and skated for the Rockets in the playoffs; once again splitting the year between juniors and midget hockey with the CAC Edmonton Canadians. He had 1 goal and was +2 with 27 penalty minutes during the regular season for the Rockets, who finished first in the B.C. Division. He skated in 6 of 10 playoff games as Kelowna reached the second round. Goulbourne had an even plus/minus with no points and 6 penalty minutes in the playoffs. In 26 midget major games he scored 10 goals with 16 assists and had 69 penalty minutes.
2011-12: Goulbourne skated in 63 games for Kelowna in his first full season in the WHL; sharing the team lead in penalty minutes (109) with Mitchell Chapman. Goulbourne scored 6 goals with 8 assists and was -8. Kelowna finished third in the B.C. Division but was swept by Portland in the first round of the playoffs. Goulbourne finished -4 with no points and 2 penalty minutes in four playoff games.
2012-13: Goulbourne displayed an offensive side to his game while again leading Kelowna in penalty minutes as the Rockets finished first in the B.C. Division for the second time in three years. Goulbourne scored 14 goals with 13 assists and was +7 in 64 games while amassing 135 penalty minutes. Kelowna reached the second round in the playoffs and Goulbourne scored 1 goal with 2 assists in 11 playoff games while finishing -2 with 15 penalty minutes. In his second year of draft eligibility, Goulbourne was ranked 151st amongst North American skaters in Central Scouting's final rankings and was selected by Philadelphia in the third round (151st overall) of the 2013 NHL Draft.