Elections to the United States Senate will be held on November 6, 2018, with 33 of the 100 seats in the Senate being contested in regular elections whose winners will serve six - year terms from January 3, 2019, until January 3, 2025. Currently, Democrats are expected to have 23 seats up for election along with 2 independents who caucus with them. Republicans are expected to have 8 seats up for election, with one of those being an open seat as a result of Tennessee Senator Bob Corker 's shock decision to not seek re-election in 2018, having served since 2007. The seats up for election in 2018 were last up for election in 2012, although some seats may have special elections if incumbents die or resign, as has already happened in Alabama. Democrats gained a net 2 seats in the 2016 Senate elections.
how many u s senators are up for reelection in 2018
33 of the 100 seats