2007-08: Josh Birkholz scored 34 goals with 25 assists for Blake High School in Minnesota and was named Honorable Mention All-State by AP. He was selected in the second round (26th overall) of the USHL Futures Draft by the Fargo Force. Birkholz played for Team USA at the Five Nations U-17 Tournament and at the World Junior A Challenge. He committed to the University of Minnesota for 2009-10.
2008-09: Birkholz played with the USHL Fargo Force. He scored 21 goals with 15 assists and was -3 and 52 PIM in 51 games.
2009-10: Birkholz appeared in 36 games in mostly third and fourth line roles in his freshman year at the University of Minnesota. He finished with 5 goals and 1 assists and was +3 with 20 PIM. In July, he announced he was leaving school to play for the Everett Silvertips in the WHL.
2010-11: Birkholz had mixed success in his first season of junior hockey with Everett (WHL). The former Minnesota Gopher scored 18 goals, second on the team, but Everett finished under .500 and was swept in the first round of the playoffs by Portland. Along with his 18 goals he had 11 assists and was -6 with 64 PMs. Birkholz had 2 assists and was -2 with 2 PMs in the four-game series with Portland.
2011-12: Birkholz was the leading scorer for the WHL's Everett Silvertips in his second season with the club. He had 29 goals with 28 assists and was minus-15 with 58 penalty minutes in 70 games. Despite winning just 21 games, the Silvertips made the playoffs; finishing fourth in the U.S. Division. Birkholz had 1 assist and was minus-one with 4 penalty minutes in the four game playoff series with Tri-City. He was not tendered a qualifying offer by the Panthers in June, becoming an unrestricted free agent, and in July 2012 signed an AHL deal with Florida's affiliate San Antonio.
Birkholz is a good skater with a good blend of size, skill, and speed who shows power play potential, a good touch around the net and plays a defense conscious, two-way game. On the downside, he sometimes floats away from the play and is not always consistent.
Birkholz signed a contract with the San Antonio Rampage of the AHL, and is no longer a Panthers prospect.