The Ninety-Eighth Wisconsin Legislature convened from January 3, 2007, through January 5, 2009, in regular session, though it adjourned for legislative activity on June 11, 2008. The legislature also held five special sessions during the term.

The Ninety-Seventh Wisconsin Legislature convened from January 3, 2005, to January 3, 2007, in regular session, and held two concurrent special sessions in January 2005 and February 2006, and two extraordinary sessions in July 2005 and April 2006.