Senate Elections 2018 | US Senate Elections | Montana Races
2018 Montana US Senate Election Results
Jon Tester
Percent: 50.33%
Votes: 253,876
Matt Rosendale
Percent: 46.78%
Votes: 235,963
Race Summary
In the 2018 U.S. Senate election in Montana, incumbent Democrat Jon Tester won re-election, defeating Republican State Auditor Matt Rosendale with 50.33% of the vote to Rosendale's 46.78%. Despite significant campaigning efforts by President Donald Trump to unseat him, Tester achieved his first majority win in a Senate race, bolstered by high turnout in Democratic-leaning areas.
Full Results
Jon Tester (DEM)
Percent: 50.33%
Votes: 253,876
Matt Rosendale (REP)
Percent: 46.78%
Votes: 235,963
Rick Breckenridge (LIB)
Percent: 2.88%
Votes: 14,545
Total votes: 504,384
State Map
Results by County
Beaverhead County
Jon Tester (DEM)
Percent: 38.31%
Votes: 1,876
Matt Rosendale (REP)
Percent: 58.53%
Votes: 2,866
Rick Breckenridge (LIB)
Percent: 3.17%
Votes: 155
Total votes: 4,897
Carbon County
Jon Tester (DEM)
Percent: 44.17%
Votes: 2,680
Matt Rosendale (REP)
Percent: 52.89%
Votes: 3,209
Rick Breckenridge (LIB)
Percent: 2.93%
Votes: 178
Total votes: 6,067
Custer County
Jon Tester (DEM)
Percent: 39.77%
Votes: 1,942
Matt Rosendale (REP)
Percent: 56.56%
Votes: 2,762
Rick Breckenridge (LIB)
Percent: 3.67%
Votes: 179
Total votes: 4,883
Fallon County
Jon Tester (DEM)
Percent: 21.80%
Votes: 281
Matt Rosendale (REP)
Percent: 73.78%
Votes: 951
Rick Breckenridge (LIB)
Percent: 4.42%
Votes: 57
Total votes: 1,289
Garfield County
Jon Tester (DEM)
Percent: 11.88%
Votes: 81
Matt Rosendale (REP)
Percent: 83.72%
Votes: 571
Rick Breckenridge (LIB)
Percent: 4.40%
Votes: 30
Total votes: 682
Hill County
Jon Tester (DEM)
Percent: 58.36%
Votes: 3,729
Matt Rosendale (REP)
Percent: 38.09%
Votes: 2,434
Rick Breckenridge (LIB)
Percent: 3.55%
Votes: 227
Total votes: 6,390
Lewis & Clark County
Jon Tester (DEM)
Percent: 57.70%
Votes: 20,506
Matt Rosendale (REP)
Percent: 39.69%
Votes: 14,106
Rick Breckenridge (LIB)
Percent: 2.61%
Votes: 927
Total votes: 35,539
McCone County
Jon Tester (DEM)
Percent: 22.06%
Votes: 227
Matt Rosendale (REP)
Percent: 75.12%
Votes: 773
Rick Breckenridge (LIB)
Percent: 2.82%
Votes: 29
Total votes: 1,029
Musselshell County
Jon Tester (DEM)
Percent: 23.56%
Votes: 573
Matt Rosendale (REP)
Percent: 71.67%
Votes: 1,743
Rick Breckenridge (LIB)
Percent: 4.77%
Votes: 116
Total votes: 2,432
Pondera County
Jon Tester (DEM)
Percent: 43.80%
Votes: 1,176
Matt Rosendale (REP)
Percent: 52.63%
Votes: 1,413
Rick Breckenridge (LIB)
Percent: 3.58%
Votes: 96
Total votes: 2,685
Ravalli County
Jon Tester (DEM)
Percent: 39.13%
Votes: 9,156
Matt Rosendale (REP)
Percent: 58.21%
Votes: 13,622
Rick Breckenridge (LIB)
Percent: 2.66%
Votes: 623
Total votes: 23,401
Sanders County
Jon Tester (DEM)
Percent: 33.65%
Votes: 2,071
Matt Rosendale (REP)
Percent: 62.66%
Votes: 3,856
Rick Breckenridge (LIB)
Percent: 3.69%
Votes: 227
Total votes: 6,154
Sweet Grass County
Jon Tester (DEM)
Percent: 31.08%
Votes: 652
Matt Rosendale (REP)
Percent: 65.40%
Votes: 1,372
Rick Breckenridge (LIB)
Percent: 3.53%
Votes: 74
Total votes: 2,098
Valley County
Jon Tester (DEM)
Percent: 39.80%
Votes: 1,545
Matt Rosendale (REP)
Percent: 55.05%
Votes: 2,137
Rick Breckenridge (LIB)
Percent: 5.15%
Votes: 200
Total votes: 3,882
Big Horn County
Jon Tester (DEM)
Percent: 64.73%
Votes: 3,027
Matt Rosendale (REP)
Percent: 33.32%
Votes: 1,558
Rick Breckenridge (LIB)
Percent: 1.95%
Votes: 91
Total votes: 4,676
Carter County
Jon Tester (DEM)
Percent: 17.02%
Votes: 128
Matt Rosendale (REP)
Percent: 80.05%
Votes: 602
Rick Breckenridge (LIB)
Percent: 2.93%
Votes: 22
Total votes: 752
Daniels County
Jon Tester (DEM)
Percent: 29.86%
Votes: 281
Matt Rosendale (REP)
Percent: 67.06%
Votes: 631
Rick Breckenridge (LIB)
Percent: 3.08%
Votes: 29
Total votes: 941
Fergus County
Jon Tester (DEM)
Percent: 33.90%
Votes: 1,964
Matt Rosendale (REP)
Percent: 62.83%
Votes: 3,640
Rick Breckenridge (LIB)
Percent: 3.26%
Votes: 189
Total votes: 5,793
Glacier County
Jon Tester (DEM)
Percent: 75.14%
Votes: 3,754
Matt Rosendale (REP)
Percent: 23.08%
Votes: 1,153
Rick Breckenridge (LIB)
Percent: 1.78%
Votes: 89
Total votes: 4,996
Jefferson County
Jon Tester (DEM)
Percent: 43.23%
Votes: 2,954
Matt Rosendale (REP)
Percent: 53.46%
Votes: 3,653
Rick Breckenridge (LIB)
Percent: 3.31%
Votes: 226
Total votes: 6,833
Liberty County
Jon Tester (DEM)
Percent: 37.21%
Votes: 365
Matt Rosendale (REP)
Percent: 59.73%
Votes: 586
Rick Breckenridge (LIB)
Percent: 3.06%
Votes: 30
Total votes: 981
Meagher County
Jon Tester (DEM)
Percent: 32.68%
Votes: 319
Matt Rosendale (REP)
Percent: 64.45%
Votes: 629
Rick Breckenridge (LIB)
Percent: 2.87%
Votes: 28
Total votes: 976
Park County
Jon Tester (DEM)
Percent: 52.59%
Votes: 5,114
Matt Rosendale (REP)
Percent: 44.81%
Votes: 4,357
Rick Breckenridge (LIB)
Percent: 2.60%
Votes: 253
Total votes: 9,724
Powder River County
Jon Tester (DEM)
Percent: 20.86%
Votes: 203
Matt Rosendale (REP)
Percent: 76.88%
Votes: 748
Rick Breckenridge (LIB)
Percent: 2.26%
Votes: 22
Total votes: 973
Richland County
Jon Tester (DEM)
Percent: 26.22%
Votes: 1,136
Matt Rosendale (REP)
Percent: 69.64%
Votes: 3,017
Rick Breckenridge (LIB)
Percent: 4.13%
Votes: 179
Total votes: 4,332
Sheridan County
Jon Tester (DEM)
Percent: 39.29%
Votes: 712
Matt Rosendale (REP)
Percent: 56.13%
Votes: 1,017
Rick Breckenridge (LIB)
Percent: 4.58%
Votes: 83
Total votes: 1,812
Teton County
Jon Tester (DEM)
Percent: 40.86%
Votes: 1,290
Matt Rosendale (REP)
Percent: 56.51%
Votes: 1,784
Rick Breckenridge (LIB)
Percent: 2.63%
Votes: 83
Total votes: 3,157
Wheatland County
Jon Tester (DEM)
Percent: 33.76%
Votes: 315
Matt Rosendale (REP)
Percent: 62.81%
Votes: 586
Rick Breckenridge (LIB)
Percent: 3.43%
Votes: 32
Total votes: 933
Blaine County
Jon Tester (DEM)
Percent: 64.96%
Votes: 1,961
Matt Rosendale (REP)
Percent: 32.53%
Votes: 982
Rick Breckenridge (LIB)
Percent: 2.52%
Votes: 76
Total votes: 3,019
Cascade County
Jon Tester (DEM)
Percent: 51.27%
Votes: 17,435
Matt Rosendale (REP)
Percent: 45.77%
Votes: 15,566
Rick Breckenridge (LIB)
Percent: 2.96%
Votes: 1,008
Total votes: 34,009
Dawson County
Jon Tester (DEM)
Percent: 30.27%
Votes: 1,233
Matt Rosendale (REP)
Percent: 66.29%
Votes: 2,700
Rick Breckenridge (LIB)
Percent: 3.44%
Votes: 140
Total votes: 4,073
Flathead County
Jon Tester (DEM)
Percent: 41.15%
Votes: 19,652
Matt Rosendale (REP)
Percent: 56.03%
Votes: 26,759
Rick Breckenridge (LIB)
Percent: 2.82%
Votes: 1,349
Total votes: 47,760
Golden Valley County
Jon Tester (DEM)
Percent: 28.63%
Votes: 130
Matt Rosendale (REP)
Percent: 66.74%
Votes: 303
Rick Breckenridge (LIB)
Percent: 4.63%
Votes: 21
Total votes: 454
Judith Basin County
Jon Tester (DEM)
Percent: 32.58%
Votes: 388
Matt Rosendale (REP)
Percent: 63.14%
Votes: 752
Rick Breckenridge (LIB)
Percent: 4.28%
Votes: 51
Total votes: 1,191
Lincoln County
Jon Tester (DEM)
Percent: 31.08%
Votes: 2,902
Matt Rosendale (REP)
Percent: 65.73%
Votes: 6,137
Rick Breckenridge (LIB)
Percent: 3.19%
Votes: 298
Total votes: 9,337
Mineral County
Jon Tester (DEM)
Percent: 38.14%
Votes: 785
Matt Rosendale (REP)
Percent: 57.39%
Votes: 1,181
Rick Breckenridge (LIB)
Percent: 4.47%
Votes: 92
Total votes: 2,058
Petroleum County
Jon Tester (DEM)
Percent: 18.59%
Votes: 58
Matt Rosendale (REP)
Percent: 79.49%
Votes: 248
Rick Breckenridge (LIB)
Percent: 1.92%
Votes: 6
Total votes: 312
Powell County
Jon Tester (DEM)
Percent: 37.17%
Votes: 1,026
Matt Rosendale (REP)
Percent: 59.46%
Votes: 1,641
Rick Breckenridge (LIB)
Percent: 3.37%
Votes: 93
Total votes: 2,760
Roosevelt County
Jon Tester (DEM)
Percent: 58.40%
Votes: 2,013
Matt Rosendale (REP)
Percent: 39.05%
Votes: 1,346
Rick Breckenridge (LIB)
Percent: 2.55%
Votes: 88
Total votes: 3,447
Silver Bow County
Jon Tester (DEM)
Percent: 71.55%
Votes: 11,672
Matt Rosendale (REP)
Percent: 26.03%
Votes: 4,246
Rick Breckenridge (LIB)
Percent: 2.42%
Votes: 394
Total votes: 16,312
Toole County
Jon Tester (DEM)
Percent: 32.90%
Votes: 626
Matt Rosendale (REP)
Percent: 63.48%
Votes: 1,208
Rick Breckenridge (LIB)
Percent: 3.63%
Votes: 69
Total votes: 1,903
Wibaux County
Jon Tester (DEM)
Percent: 25.83%
Votes: 140
Matt Rosendale (REP)
Percent: 71.96%
Votes: 390
Rick Breckenridge (LIB)
Percent: 2.21%
Votes: 12
Total votes: 542
Broadwater County
Jon Tester (DEM)
Percent: 32.84%
Votes: 1,071
Matt Rosendale (REP)
Percent: 63.97%
Votes: 2,086
Rick Breckenridge (LIB)
Percent: 3.19%
Votes: 104
Total votes: 3,261
Chouteau County
Jon Tester (DEM)
Percent: 47.99%
Votes: 1,275
Matt Rosendale (REP)
Percent: 49.38%
Votes: 1,312
Rick Breckenridge (LIB)
Percent: 2.63%
Votes: 70
Total votes: 2,657
Deer Lodge County
Jon Tester (DEM)
Percent: 68.27%
Votes: 2,892
Matt Rosendale (REP)
Percent: 28.52%
Votes: 1,208
Rick Breckenridge (LIB)
Percent: 3.21%
Votes: 136
Total votes: 4,236
Gallatin County
Jon Tester (DEM)
Percent: 59.45%
Votes: 33,251
Matt Rosendale (REP)
Percent: 37.99%
Votes: 21,248
Rick Breckenridge (LIB)
Percent: 2.56%
Votes: 1,434
Total votes: 55,933
Granite County
Jon Tester (DEM)
Percent: 38.76%
Votes: 695
Matt Rosendale (REP)
Percent: 58.34%
Votes: 1,046
Rick Breckenridge (LIB)
Percent: 2.90%
Votes: 52
Total votes: 1,793
Lake County
Jon Tester (DEM)
Percent: 50.22%
Votes: 6,916
Matt Rosendale (REP)
Percent: 47.13%
Votes: 6,491
Rick Breckenridge (LIB)
Percent: 2.65%
Votes: 365
Total votes: 13,772
Madison County
Jon Tester (DEM)
Percent: 38.11%
Votes: 1,890
Matt Rosendale (REP)
Percent: 58.44%
Votes: 2,898
Rick Breckenridge (LIB)
Percent: 3.45%
Votes: 171
Total votes: 4,959
Missoula County
Jon Tester (DEM)
Percent: 67.62%
Votes: 41,688
Matt Rosendale (REP)
Percent: 30.22%
Votes: 18,631
Rick Breckenridge (LIB)
Percent: 2.16%
Votes: 1,332
Total votes: 61,651
Phillips County
Jon Tester (DEM)
Percent: 27.71%
Votes: 577
Matt Rosendale (REP)
Percent: 68.49%
Votes: 1,426
Rick Breckenridge (LIB)
Percent: 3.79%
Votes: 79
Total votes: 2,082
Prairie County
Jon Tester (DEM)
Percent: 27.11%
Votes: 177
Matt Rosendale (REP)
Percent: 68.91%
Votes: 450
Rick Breckenridge (LIB)
Percent: 3.98%
Votes: 26
Total votes: 653
Rosebud County
Jon Tester (DEM)
Percent: 44.88%
Votes: 1,511
Matt Rosendale (REP)
Percent: 52.42%
Votes: 1,765
Rick Breckenridge (LIB)
Percent: 2.70%
Votes: 91
Total votes: 3,367
Stillwater County
Jon Tester (DEM)
Percent: 30.86%
Votes: 1,501
Matt Rosendale (REP)
Percent: 65.91%
Votes: 3,206
Rick Breckenridge (LIB)
Percent: 3.23%
Votes: 157
Total votes: 4,864
Treasure County
Jon Tester (DEM)
Percent: 31.16%
Votes: 129
Matt Rosendale (REP)
Percent: 67.39%
Votes: 279
Rick Breckenridge (LIB)
Percent: 1.45%
Votes: 6
Total votes: 414
Yellowstone County
Jon Tester (DEM)
Percent: 46.53%
Votes: 32,225
Matt Rosendale (REP)
Percent: 50.08%
Votes: 34,682
Rick Breckenridge (LIB)
Percent: 3.39%
Votes: 2,351
Total votes: 69,258