| Election Name: | 2018 Montana Senate election |
| Country: | Montana |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 2016 Montana Senate election |
| Previous Year: | 2016 |
| Next Election: | 2020 Montana Senate election |
| Next Year: | 2020 |
| Seats For Election: | 25 seats in the Montana Senate |
| Majority Seats: | 26 |
| Leader1: | Scott Sales |
| Party1: | Republican Party (United States) |
| Colour1: | ff3333 |
| Leader Since1: | January 2, 2017 |
| Leaders Seat1: | 35th-Bozeman |
| Last Election1: | 32 |
| Seats1: | 30 |
| Seat Change1: | 2 |
| Popular Vote1: | 128,760 |
| Percentage1: | 54.76% |
| Leader2: | Jon Sesso |
| Party2: | Democratic Party (United States) |
| Colour2: | 3333ff |
| Leader Since2: | January 5, 2015 |
| Leaders Seat2: | 37th-Butte |
| Last Election2: | 18 |
| Seats2: | 20 |
| Seat Change2: | 2 |
| Popular Vote2: | 99,828 |
| Percentage2: | 42.45% |
| Senate President | |
| Before Election: | Scott Sales |
| Before Party: | Republican Party (United States) |
| After Election: | Scott Sales |
| After Party: | Republican Party (United States) |
| Map Size: | 500px |
An election was held on November 6, 2018, to elect 25 members to Montana's Senate. The election coincided with elections for other offices, including the U.S Senate, U.S. House of Representatives, and state house. The primary election was held on June 2, 2018.[1]
| Party | Candi- dates | Votes | Seats | |||||
|---|---|---|---|---|---|---|---|---|
| No. | % | No. | +/– ! | % | ||||
| 23 | 128,760 | 54.76% | 30 | 2 | 60 | |||
| 21 | 99,828 | 42.45% | 20 | 2 | 40 | |||
| 1 | 4,274 | 1.82% | 0 | 0 | ||||
| 5 | 2,292 | 0.97% | 0 | 0 | ||||
| Total | 50 | 235,154 | 100% | 50 | 100 | |||
Districts where the margin of victory was under 10%:
Incumbent Republican Chas Vincent has represented the 1st district since 2011. Vincent was term-limited and couldn't seek re-election.
Incumbent Republican Mark Blasdel has represented the 4th district since 2014.
Incumbent Republican Bob Keenan has represented the 4th district since 2015.
Incumbent Democrat Lea Whitford has represented the 8th district since 2015. Whitford didn't seek re-election.
Incumbent Republican Llew Jones has represented the 9th district since 2011. Jones was term-limited and successfully ran for a seat in the state house.
Incumbent Republican Edward Buttrey has represented the 11th district and its predecessors since 2011. Buttrey was term-limited and successfully ran for a seat in the state house. State Representative Tom Jacobson, a Democrat, won the open seat.
Incumbent Democrat Carlie Boland has represented the 12th district since 2017.
Incumbent Republican Brian Hoven has represented the 13th district since 2015.
Incumbent Republican Russel Tempel has represented the 14th district since 2017.
Incumbent Republican Eric Moore has represented the 19th district and its predecessors since 2011. Moore was term-limited and successfully ran for a seat in the state house.
Incumbent Republican Duane Ankney has represented the 20th district since 2015.
Incumbent Republican Douglas Kary has represented the 22nd district since 2015.
Incumbent Democrat Mary McNally has represented the 24th district since 2015.
Incumbent Republican Cary Smith has represented the 27th district since 2015.
Incumbent Republican David Howard has represented the 29th district since 2015.
Incumbent Republican Nels Swandal has represented the 30th district since 2015. Swandal didn't seek re-election.
Incumbent Republican Jedediah Hinkle has represented the 32nd district since 2014. He lost re-election to Democrat Pat Flowers.
Incumbent Democrat Jennifer Pomnichowski has represented the 33rd district since 2015.
Incumbent Republican Gordon Vance has represented the 34th district since 2015.
Incumbent Democrat Mary Caferro has represented the 41st district and its predecessors since 2011. Caferro was term-limited and successfully ran for a seat in the state house. State representative Janet Ellis won the open seat.
Incumbent Democrat Jill Cohenour has represented the 43rd district since 2015.
Incumbent Republican Pat Connell has represented the 43rd district since 2015. Connell lost re-nomination to fellow Republican Jason Ellsworth.
Incumbent Democrat Nate McConnell has represented the 48th district since 2018.
Incumbent Democrat Diane Sands has represented the 49th district since 2015.
Incumbent Democrat Tom Facey has represented the 50th district and its predecessors since 2011. Facey was term-limited and couldn't seek re-election. State Representative Bryce Bennett won the open seat.