Howden started playing minor hockey when he was five. Before starting to play hockey, he broke his femur in a bicycle accident, and had to spend two months in a cast from chest to toe. As a result of the injury, his doctors doubted he would be a very good athlete.[3][4]
Howden was the first overall choice in the 2007 Western Hockey League (WHL) Bantam Draft by the Moose Jaw Warriors. After weighing his options between National Collegiate Athletic Association (NCAA) hockey and the WHL, Howden chose to sign with the Warriors shortly after the draft.[5] Howden played five games with the Warriors as an affiliate player[5] during the 2007–08 season, before joining the club full-time for the 2008–09 season.[6] He had a relatively quiet rookie season, but really came out in his sophomore season setting a point-per-game pace.
After a 65-point season with Moose Jaw, Howden was drafted in the first round, 25th overall, in the 2010 NHL Entry Draft by the Florida Panthers.[7] In 2011, he signed a three-year, entry-level contract with Florida but was sent back to Moose Jaw for his final year of junior. In the 2012–13 season, he split time between Florida and their American Hockey League (AHL) affiliate; in 18 games with Florida, he had no points.
After four seasons within the Panthers' organization, Howden failed to receive a qualifying offer and therefore left as a free agent to sign a one-year, two-way contract with the Winnipeg Jets on July 1, 2016.[8]
After spending the majority of the 2016–17 season with the Jets' AHL affiliate, the Manitoba Moose, Howden failed to receive a qualifying offer.
After two seasons in Belarus with Dinamo Minsk, Howden left as a free agent to sign a one-year contract to continue in the KHL with Russian outfit, Torpedo Nizhny Novgorod on August 6, 2019.[11] In the 2019–20 season, Howden posted 7 goals and 13 points in 36 games before he was traded by Torpedo to HC Vityaz on December 23, 2019.[12] In the second half of the season, Howden in a top 6 scoring role contributed with 4 goals and 7 points in 19 games. He made his KHL playoff debut with Vityaz, finishing as the club's leading goalscorer with 2 goals in a 4 games series sweep defeat to SKA Saint Petersburg.