2018 Montana U.S. Senate Election

Montana · 3 candidates · See every 2018 U.S. Senate race

Who won the 2018 Montana U.S. Senate Election?

Jon Tester won the 2018 Montana U.S. Senate Election. Jon Tester received 253,876 popular votes (50.33%). The main challenger was Matt Rosendale (46.78%).

See the full head-to-head between Tester and Rosendale

Tester +3.5 pts · won by 17,913 votes

Jon Tester DemocraticWINNER50.33%

253,876 votes

Matt Rosendale Republican46.78%

235,963 votes

Rick BreckenridgeLibertarian2.88%

14,545 votes

Popular-vote totals for U.S. Senate elections come from the MIT Election Data and Science Lab (1976–2024).

Data last verified July 28, 2026.