[citation needed] In 2001, their first year of existence, the Sirens won the divisional title and advanced to the playoffs of the Women's American Football League.

In 2004 Sacramento hosted the IWFL National Championship game where the Sirens defeated their New York rival again.

A year later, in Manchester, New Hampshire, the Sirens defeated the Atlanta Xplosion in the 2005 IWFL national championship.

In 2007, the Sirens finished 7–1, winning another division title and defeating the Seattle Majestics in the semifinal round.

However, 2010 marked the Sirens' return to dominance, as they finished 8-0 and once again won the Pacific West division title.