In the season leading up to the NHL draft, Howden recorded 24 goals and 40 assists over 68 games with the Moose Jaw Warriors of the Western Hockey League (WHL).

[3] After the Moose Jaw Warriors were eliminated from the 2017 WHL playoffs, Howden joined the Syracuse Crunch on an amateur tryout (ATO) agreement.

[4] On April 7, 2017, the Crunch's head coach, Benoit Groulx, announced that Howden would make his professional debut in a game against the Binghamton Senators.

[7] On February 26, 2018, Howden was traded to the New York Rangers, along with Vladislav Namestnikov, Libor Hájek, and 2018 and 2019 draft picks, for Ryan McDonagh and J. T.

[8] On July 17, 2021, Howden was traded to the Vegas Golden Knights in exchange for Nick DeSimone and a 2022 fourth-round pick.