Except for a six-game stint with the Boston Bruins, Blackburn spent the majority of the early portion of his career with various minor league teams. He was a dominant force with the Quebec Aces of the AHL during the mid-1960s, including a 36-goal performance in 1965–66. He was selected by the Philadelphia Flyers in the NHL expansion draft and was a regular contributor during the first two years of the fledgling team's existence.
Apart from a six-game stint with the Boston Bruins, Blackburn spent most of his early career with various minor league teams. He was a dominant force with the Quebec Aces of the AHL during the mid-1960s, including a 36-goal performance in 1965–66. He was selected by the Philadelphia Flyers in the NHL expansion draft and was a regular contributor during the first two years of the fledgling team's existence.