Following the ending of the King County Jaguars franchise, former player Mike Astley left the crumbling team to form his own group with Michael Stuart, a former Eastside Chiefs coach a decade earlier.  The team was originally slated to compete in the Cascade Football League, but a fortuitous switch to the North American League Northwest Division kept them away from the quick collapse of the CFL.

Opening the 2010 season with a win over the Olympic Peninsula Eagles, a stunning loss to the Thunder began a series of blowouts saved only by a win over a struggling Portland Raider team 17-7.  After six games, the Xtreme threw in the towl forfeiting the last half of the season for undisclosed reasons.

The team would return in 2011 rebranded as the Cascade Xtreme in the Western Washington Football Assocation, an offshoot of the collapsed Cascade Football League.  Again, the team struggled opening up with five consecutive losses before forfeiting the remainder of the schedule.  The team remain out of action for the next two seasons.

A Northwest eight-man league was announced to be forming, which seemed to be an ideal landing spot with the low roster numbers turning out for the squad.  This squad, known now as the Washington Xtreme would appear in the 2014 NW8 league championship against the Inner City Shine out of Portland, but lost to the undefeated champions 66-28.

After a four-year hiatus, it was announced on Facebook that 2018 would mark the return of the Seattle Xtreme under Michael Stuart hoping to collect up players from the now defunct Puyallup Nation Kings.  By April, after a few meetings and practices, the team had dissolved and players scattered to new teams, most of the Kings players joining the Wenatchee Valley Rams for that organizations final season, ending as GNFA Regional Champions.