The Seattle Grizzlies were initially founded as the Seattle Jets in October 1998 and played their first competitive matches in 1999. In their debut season at USAFL Nationals, the club finished third.

Each year since then, the Grizzlies have been represented in the USA’s premier Australian Rules Football tournament, taking home a victory in the 2017 Division 3 National Championships in San Diego, 2008 Division 2 Championships in Colorado Springs and falling one goal short of the Division 1 title in 2009.

During the late 2000s, the team focused on player development and several local talents Ryan Kastl, Zach Johns and Kevin Stanley were chosen to represent the USA Revolution in the 2014 International Cup. 2017 saw new cubs, Max DePina and Kiel Rasp chosen to represent their nation in IC17.

The Grizzlies’ Team of the Decade was named in October 2009, featuring key contributors like Ryan Kastl, Matthew Muller, Andrew Donlen and Greg Morton.

The Seattle Grizzlies maintain a strong presence in local, regional and national competitions competing in the British Columbia Australian Football League (BCAFL) during the home and away season while also traveling nationally to play other USAFL teams from major cities including the Portland Steelheads, Sacramento Suns, Golden Gate Roos, Orange County Bombers, Minnesota Freeze, LA Dragons and San Diego Lions.