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.
Results summary Party Candi-dates Votes Seats No. % No. +/– % Republican Party 23 128,760 54.76% 30 2 60 Democratic Party 21 99,828 42.45% 20 2 40 Independent 1 4,274 1.82% 0 0 Libertarian Party 5 2,292 0.97% 0 0Total 50 235,154 100% 50 100
Close races Districts where the margin of victory was under 10%: District 14, 1.48% District 12, 2.9% District 49, 3.18% District 32, 3.59% gain District 24, 7.98% District 30, 8.84% District 13, 9.26%
Incumbents defeated in the primary election Pat Connell (R-District 43), defeated by Jason Ellsworth (R)
Incumbents defeated in the general election Jedediah Hinkle (R-District 32), defeated by Pat Flowers (D)
Open seats that changed parties Edward Buttrey (R-District 11) was term-limited, seat won by Tom Jacobson (D)
Predictions SourceRankingAs of Governing | October 8, 2018
Summary of results by state senate district State senate districtIncumbentPartyElected senatorParty Montana 1Chas VincentRepMike CuffeRep Montana 4Mark BlasdelRepMark BlasdelRep Montana 5Bob KeenanRepBob KeenanRep Montana 8Lea WhitfordDemSusan WebberDem Montana 9Llew JonesRepBruce GillespieRep Montana 11Edward ButtreyRepTom JacobsonDem Montana 12Carlie BolandDemCarlie BolandDem Montana 13Brian HovenRepBrian HovenRep Montana 14Russel TempelRepRussel TempelRep Montana 19Eric MooreRepKenneth BognerRep Montana 20Duane AnkneyRepDuane AnkneyRep Montana 22Douglas KaryRepDouglas KaryRep Montana 24Mary McNallyDemMary McNallyDem Montana 27Cary SmithRepCary SmithRep Montana 29David HowardRepDavid HowardRep Montana 30Nels SwandalRepJohn EspRep Montana 32Jedediah HinkleRepPat FlowersDem Montana 33Jennifer PomnichowskiDemJennifer PomnichowskiDem Montana 34Gordon VanceRepGordon VanceRep Montana 41Mary CaferroDemJanet EllisDem Montana 42Jill CohenourDemJill CohenourDem Montana 43Pat ConnellRepJason EllsworthRep Montana 48Nate McConnellDemNate McConnellDem Montana 49Diane SandsDemDiane SandsDem Montana 50Tom FaceyDemBryce BennettDem
Detailed results
Districts 1–22 District 1 Incumbent Republican Chas Vincent had represented the 1st district since 2011. Vincent was term-limited and could not seek re-election.
District 4 Incumbent Republican Mark Blasdel had represented the 4th district since 2014.
District 5 Incumbent Republican Bob Keenan had represented the 4th district since 2015.
District 8 Incumbent Democrat Lea Whitford had represented the 8th district since 2015. Whitford did not seek re-election.
District 9 Incumbent Republican Llew Jones had represented the 9th district since 2011. Jones was term-limited and successfully ran for a seat in the state house.
District 11 Incumbent Republican Edward Buttrey had 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.
District 12 Incumbent Democrat Carlie Boland had represented the 12th district since 2017.
District 13 Incumbent Republican Brian Hoven had represented the 13th district since 2015.
District 14 Incumbent Republican Russel Tempel had represented the 14th district since 2017.
District 19 Incumbent Republican Eric Moore had represented the 19th district and its predecessors since 2011. Moore was term-limited and successfully ran for a seat in the state house.
District 20 Incumbent Republican Duane Ankney had represented the 20th district since 2015.
District 22 Incumbent Republican Douglas Kary had represented the 22nd district since 2015.
Districts 24–50 District 24 Incumbent Democrat Mary McNally had represented the 24th district since 2015.
District 27 Incumbent Republican Cary Smith had represented the 27th district since 2015.
District 29 Incumbent Republican David Howard had represented the 29th district since 2015.
District 30 Incumbent Republican Nels Swandal had represented the 30th district since 2015. Swandal did not seek re-election.
District 32 Incumbent Republican Jedediah Hinkle had represented the 32nd district since 2014. He lost re-election to Democrat Pat Flowers.
District 33 Incumbent Democrat Jennifer Pomnichowski had represented the 33rd district since 2015.
District 34 Incumbent Republican Gordon Vance had represented the 34th district since 2015.
District 41 Incumbent Democrat Mary Caferro had 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.
District 42 Incumbent Democrat Jill Cohenour had represented the 43rd district since 2015.
District 43 Incumbent Republican Pat Connell had represented the 43rd district since 2015. Connell lost re-nomination to fellow Republican Jason Ellsworth.
District 48 Incumbent Democrat Nate McConnell had represented the 48th district since 2018.
District 49 Incumbent Democrat Diane Sands had represented the 49th district since 2015.
District 50 Incumbent Democrat Tom Facey had represented the 50th district and its predecessors since 2011. Facey was term-limited and could not seek re-election. State Representative Bryce Bennett won the open seat.
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