The 1918 United States Senate election in Montana took place on November 5, 1918. Incumbent United States Senator Thomas J. Walsh, who was first elected to the Senate in 1912, ran for re-election. He won the Democratic primary uncontested, and was opposed in the general election by Oscar M. Lanstrum, a former State Representative and the Republican nominee, and Jeannette Rankin, one of two United States representatives from Montana's at-large congressional district and the nominee of the National Party. Walsh narrowly won his second term in the Senate.
The 1924 United States Senate election in Montana took place on November 4, 1924. Incumbent United States Senator Thomas J. Walsh, who was first elected to the Senate in 1912 by the state legislature, and re-elected in 1918 by popular vote, ran for re-election. He was unopposed in the Democratic primary.
The 1934 United States Senate special election in Montana took place on November 6, 1934. Incumbent United States Senator John E. Erickson, who, as governor, had appointed himself to the seat in 1933 upon the death of Thomas J. Walsh, ran for re-election. However, he was defeated in the Democratic primary by James E. Murray, who was the former Silver Bow County Attorney and the Chairman of the State Advisory Board of the Public Works Administration. In the general election, Murray defeated Scott Leavitt, a former United States Congressman who had represented Montana's 2nd congressional district, and an independent candidate in a landslide to win his first term in the Senate.
The 1930 United States Senate election in Montana took place on November 3, 1936. Incumbent United States Senator James E. Murray, who was first elected to the Senate in a special election in 1934, ran for re-election. He narrowly emerged from a competitive and close Democratic primary, wherein he was challenged by United States Congressman Joseph P. Monaghan, who represented Montana's 1st congressional district. In the general election, Murray was opposed by Thomas O. Larson, a State Senator and the Republican nominee, and Monaghan, who, after losing the primary, ran as an independent candidate. Murray ended up winning a second term, and his first full term, in a landslide, defeating both of his opponents by a comfortable margin.
The 1966 United States Senate election in Montana took place on November 8, 1966. Incumbent United States Senator Lee Metcalf, who was first elected to the Senate in 1960, ran for re-election. He won the Democratic primary uncontested, and moved on to the general election, where he was opposed by Tim M. Babcock, the Republican nominee and the Governor of Montana. Though the race remained close, Metcalf was able to expand on his 1960 margin of victory, and defeated Babcock to win a second term.
The 1934 United States Senate election in Montana took place on November 6, 1934. Incumbent United States Senator Burton K. Wheeler, who was first elected to the Senate in 1922, and was re-elected in 1928, ran for re-election. After easily winning the Democratic primary, Wheeler moved on to the general election, where he faced George M. Bourquin, a former United States Federal Judge and the Republican nominee. In a stark contrast to his close campaign in 1928, Wheeler won re-election to his third Senate term in a landslide.
The 1940 United States Senate election in Montana took place on November 5, 1940. Incumbent United States Senator Burton K. Wheeler, who was first elected to the Senate in 1922, and was re-elected in 1928 and 1934, ran for re-election. Though he faced a serious challenger in the Democratic primary, he emerged victorious, and advanced to the general election, where he faced E. K. Cheadle, a state district judge and the Republican nominee. Just like in 1934, Wheeler won re-election in a landslide, winning his fourth term in the Senate.
The 1988 Montana gubernatorial election took place on November 8, 1988. Incumbent Governor of Montana Ted Schwinden, who was first elected in 1980 and was re-elected in 1984, declined to seek re-election to a third term, creating an open seat. Stan Stephens, the former president of the Montana Senate, won a close Republican primary, and advanced to the general election, where he was opposed by Thomas Lee Judge, Schwinden's predecessor as governor and the Democratic nominee. Though the general election was hotly contested, Stephens ultimately defeated Judge, becoming the first Republican to win a gubernatorial election in Montana since 1964.
The 1984 Montana gubernatorial election took place on November 6, 1984. Incumbent Governor of Montana Ted Schwinden, who was first elected in 1980, ran for re-election. Schwinden won the Democratic primary against a perennial candidate, and moved on to the general election, where he faced Pat M. Goodover, a State Senator and the Republican nominee. Although then-President Ronald Reagan won the state in a landslide that year in the presidential election, Schwinden defeated Goodover with over 70% of the vote to win his second and final term as governor. This was the last time that Democrats won a gubernational election in Montana until 2004.
The 1980 Montana gubernatorial election took place on November 4, 1980. Incumbent Governor of Montana Thomas Lee Judge, who was first elected in 1972 and was re-elected in 1976, ran for re-election. He faced a stiff challenge in the Democratic primary from his lieutenant governor, Ted Schwinden, and he ultimately lost renomination. Schwinden, advancing to the general election, faced Jack Ramirez, the Minority Leader of the Montana House of Representatives and the Republican nominee. Although Ronald Reagan, the Republican presidential nominee, won the state in a landslide that year, Schwinden comfortably defeated Ramirez to win his first of two terms as governor.
The 1972 Montana gubernatorial election took place on November 7, 1972. Incumbent Governor of Montana Forrest H. Anderson, who was first elected in 1968, declined to seek re-election. Thomas Lee Judge, the Lieutenant Governor of Montana, won a competitive Democratic primary, and moved on to the general election, where he faced Ed Smith, a rancher and the Republican nominee. Although then-President Richard Nixon won the state in a landslide in that year's presidential election, Judge managed to handily defeat Smith, winning his first of two terms as governor.
The 1968 Montana gubernatorial election took place on November 5, 1968. Incumbent Governor of Montana Tim Babcock, who became Governor upon the death of previous Governor Donald Grant Nutter and was elected in 1964, ran for re-election. He faced serious competition in the Republican primary from his Lieutenant Governor, but managed to comfortably win renomination. Advancing to the general election, Babcock faced Forrest H. Anderson, the Attorney General of Montana and the Democratic nominee, and independent candidate Wayne Montgomery of the New Reform Party. Ultimately, Anderson managed to defeat Babcock by a solid margin, winning his first and only term as governor. As of 2023, this is the last time an incumbent Governor of Montana lost re-election.
The 1964 Montana gubernatorial election took place on November 3, 1964. Incumbent Governor of Montana Tim M. Babcock, who became Governor upon the death of previous Governor Donald Grant Nutter, ran for re-election. He won the Republican primary unopposed, and advanced to the general election, where he faced Roland Renne, the former President of Montana State College and the Democratic nominee, in the general election. Despite the fact that then-President Lyndon B. Johnson won the state handily in that year's presidential election, Babcock managed to narrowly defeat Renne to win his second and final term as governor.
The 1956 Montana gubernatorial election took place on November 6, 1956. Incumbent governor of Montana J. Hugo Aronson, who was first elected Governor in 1952, ran for re-election. He was unopposed in the Republican primary and advanced to the general election, where he faced Arnold Olsen, the Attorney General of Montana and the Democratic nominee. Despite the fact that then-President Dwight D. Eisenhower won the state in a landslide that year in the presidential election, Aronson only narrowly defeated Arnold to win his second and final term as governor.
The 1952 Montana gubernatorial election took place on November 4, 1952. Incumbent Governor of Montana John W. Bonner, who was first elected governor in 1948, ran for re-election. He was unopposed in the Democratic primary and moved on to the general election, where he was opposed by J. Hugo Aronson, a State Senator and the Republican nominee. A close election ensued, with Aronson narrowly defeating Bonner to win the first of his two terms as governor.
The 1948 Montana gubernatorial election took place on November 2, 1948. Incumbent Governor of Montana Sam C. Ford, who was first elected Governor in 1940 and was re-elected in 1944, ran for re-election. He won the Republican primary and advanced to the general election, where he faced John W. Bonner, the former Attorney General of Montana and the Democratic nominee. Ultimately, Bonner defeated Ford handily in his bid for re-election, winning his first and only term as governor.
The 1940 Montana gubernatorial election took place on November 5, 1940. Incumbent Governor of Montana Roy E. Ayers, who was first elected governor in 1936, ran for re-election. He narrowly won the Democratic primary by just over a thousand votes to win renomination, and advanced to the general election, where he was opposed by Sam C. Ford, a former Associate Justice of the Montana Supreme Court and the Republican nominee. Ultimately, in spite of the fact that then-President Franklin D. Roosevelt comfortably won the state in that year's presidential election, Ford narrowly defeated Ayers to win his first of two terms as governor.
The 1928 Montana gubernatorial election took place on November 6, 1928. Incumbent Governor of Montana John E. Erickson, who was first elected governor in 1924, ran for re-election. Erickson only narrowly won the Democratic primary against future Governor Roy E. Ayers, and advanced to the general election, where he was opposed by U.S. Attorney Wellington D. Rankin, the former Attorney General of Montana. Although Herbert Hoover carried the state in a landslide in the presidential election that year, Erickson won re-election to his second term as governor in a landslide over Rankin.
The 1924 Montana gubernatorial election took place on November 4, 1924. Incumbent Governor of Montana Joseph M. Dixon, who was first elected governor in 1920, ran for re-election. Dixon won a competitive Republican primary, and moved on to the general election, where he faced John E. Erickson, a former district court judge and the Democratic nominee; and Frank J. Edwards, the 1916 Republican nominee for governor and the Farmer–Labor Party nominee. Ultimately, Erickson managed to defeat Dixon in his bid for re-election, winning what would be the first of three terms as governor.
The 1916 Montana gubernatorial election took place on November 7, 1916. Incumbent Governor of Montana Sam V. Stewart, who was first elected governor in 1912, ran for re-election. After comfortably winning the Democratic primary, he advanced to the general election, where he faced Frank J. Edwards, the former Mayor of Helena, who narrowly emerged victorious in a close Republican primary. Benefitting from then-President Woodrow Wilson's landslide victory in Montana in the presidential election that year, Stewart narrowly won re-election to his second and final term as governor.
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