The One Hundred Fourth Wisconsin Legislature convened from January 7, 2019, to January 4, 2021, in regular session, though it adjourned for legislative activity on May 13, 2020. The Legislature also held two extraordinary sessions and six special sessions during the legislative term.

The One Hundred Third Wisconsin Legislature convened from January 3, 2017, to January 7, 2019, in regular session, though it adjourned for legislative activity on May 9, 2018. The Legislature also held four extraordinary sessions and four special sessions during the legislative term.