United States Senate elections in Colorado occur when voters in the U.S. state of Colorado select an individual to represent the state in the United States Senate in either of the state's two seats allotted by the Constitution. Regularly scheduled general elections occur on Election Day, coinciding with various other federal, statewide, and local races.

Each state is allotted two U.S. Senators elected to staggered six-year terms, which were originally selected by the state legislature. The Senate is divided into three classes to stagger the terms of its members such that one-third of the Senate would be up for re-election every two years. Upon Colorado's admission to the Union in 1876, the state was assigned a Class 2 seat and a Class 3 seat, first elected in 1876. Since the passage of the Seventeenth Amendment in 1913, U.S. Senators are elected directly by the voters of each state. Special elections may be held to fill mid-term vacancies to elect an individual to serve the remainder of the unexpired term.

The list below contains results from all U.S. Senate elections held in Colorado after the passage of the Seventeenth Amendment, sorted by year. The next scheduled election for the Class 2 seat is in 2026, while the Class 3 seat will hold its next election in 2028.

List of recent elections

Class 2 Year Winner Runner(s)-up Others Ref Candidate Party Votes % Candidate Party Votes % Votes % 1918 Lawrence C. Phipps Republican 107,726 John F. Shafroth Democratic 104,347 5,606 1924 Lawrence C. Phipps* Republican 159,698 Alva B. Adams Democratic 139,660 2,772 Morton Alexander Farmer–Labor 16,039 1930 Edward P. Costigan Democratic 180,028 George H. Shaw Republican 137,487 4,826 1936 Edwin C. Johnson Democratic 299,376 Raymond Sauter Republican 166,308 6,143 1942 Edwin C. Johnson* Democratic 174,612 Ralph Lawrence Carr Republican 170,970 2,014 1948 Edwin C. Johnson* Democratic 340,719 Will Nicholson Republican 165,069 4,333 1954 Gordon Allott Republican 248,502 John A. Carroll Democratic 235,686 1960 Gordon Allott* Republican 389,428 Robert Lee Knous Democratic 331,752 3,351 1966 Gordon Allott* Republican 368,307 Roy Romer Democratic 266,198 332 1972 Floyd Haskell Democratic 457,545 Gordon Allott* Republican 447,957 20,581 1978 William L. Armstrong Republican 480,801 Floyd Haskell* Democratic 330,148 8,307 1984 William L. Armstrong* Republican 833,821 64.25% Nancy Dick Democratic 449,327 34.62% 3,584 0.28% 1990 Hank Brown Republican 569,048 55.68% Josie Heath Democratic 425,746 41.66% 27,233 2.66% 1996 Wayne Allard Republican 750,325 51.06% Tom Strickland Democratic 677,600 46.11% 41,686 2.84% 2002 Wayne Allard* Republican 717,893 50.70% Tom Strickland Democratic 648,130 45.77% 50,059 3.53% 2008 Mark Udall Democratic 1,231,049 52.80% Bob Schaffer Republican 990,784 42.49% 109,879 4.71% 2014 Cory Gardner Republican 983,891 48.20% Mark Udall* Democratic 944,203 46.26% 112,964 5.53% 2020 John Hickenlooper Democratic 1,731,114 53.50% Cory Gardner* Republican 1,429,492 44.18% 75,184 2.32% County results of Class 2 elections since 2002

Class 3 Year Winner Runner(s)-up Others Ref Candidate Party Votes % Candidate Party Votes % Votes % 1914 Charles S. Thomas Democratic 102,037 40.30% Hubert Work Republican 98,728 38.99% 11,433 4.52% Benjamin Griffith Progressive 27,072 10.69% J. C. Griffiths Socialist 13,943 5.51% 1920 Samuel D. Nicholson Republican 156,577 Tully Scott Democratic 112,890 17,706 1924 (sp) Rice W. Means Republican 159,353 Morrison Shafroth Democratic 138,714 2,012 Charles T. Philip Farmer–Labor 17,542 1926 Charles W. Waterman Republican 149,585 William Ellery Sweet Democratic 138,113 9,997 1932 (sp) Karl C. Schuyler Republican 207,540 Walter Walker Democratic 206,475 11,619 1932 Alva B. Adams Democratic 226,516 Karl C. Schuyler* Republican 198,519 11,304 1938 Alva B. Adams* Democratic 262,786 Archibald A. Lee Republican 181,297 7,126 1942 (sp) Eugene Millikin Republican 191,517 James A. Marsh Democratic 143,817 5,926 1944 Eugene Millikin* Republican 277,410 Barney L. Whatley Democratic 214,335 3,143 1950 Eugene Millikin* Republican 239,724 John A. Carroll Democratic 210,442 1956 John A. Carroll Democratic 319,872 Daniel I. J. Thornton Republican 317,102 1962 Peter H. Dominick Republican 328,655 John A. Carroll* Democratic 279,586 5,203 1968 Peter H. Dominick* Republican 459,952 Stephen McNichols Democratic 325,584 1974 Gary Hart Democratic 471,688 Peter H. Dominick* Republican 325,526 26,957 1980 Gary Hart* Democratic 590,501 Mary Estill Buchanan Republican 571,295 11,346 1986 Tim Wirth Democratic 529,449 49.91% Ken Kramer Republican 512,994 48.36% 18,322 1.73% 1992 Ben Nighthorse Campbell Democratic 803,725 51.78% Terry Considine Republican 662,893 42.70% 85,671 5.52% 1998 Ben Nighthorse Campbell* Republican 829,370 62.49% Dottie Lamm Democratic 464,754 35.02% 33,111 2.49% 2004 Ken Salazar Democratic 1,081,188 51.30% Pete Coors Republican 980,668 46.53% 45,698 2.17% 2010 Michael Bennet* Democratic 854,685 48.08% Ken Buck Republican 824,789 46.40% 98,194 5.52% 2016 Michael Bennet* Democratic 1,370,710 49.97% Darryl Glenn Republican 1,215,318 44.31% 157,001 5.72% 2022 Michael Bennet* Democratic 1,397,170 55.88% Joe O'Dea Republican 1,031,693 41.26% 71,338 2.85% County results of Class 3 elections since 2004

See also List of United States senators from Colorado List of United States presidential elections in Colorado Elections in Colorado

References

External links Election Information, Office of the Clerk, U.S. House of Representatives Election and Voting Information, Federal Election Commission