2025 Senate Primary Calendar. Class i terms run from the beginning of the 116th congress on january 3, 2019, to the end of the 118th congress. Senate seats up for regular election in 2024โ10 seats held by republicans, 20 held by democrats, and three held by independents who caucus with democrats.
Learn more on when primaries, caucuses, conventions and other key events occur this. These maps reflect the ratings of a number of quantitative and qualitative forecasters, as well as some consensus projections.