# List of United States Senate elections in Colorado

Elections in Colorado :
Federal government
Presidential elections
1876
1880
1884
1888
1892
1896
1900
1904
1908
1912
1916
1920
1924
1928
1932
1936
1940
1944
1948
1952
1956
1960
1964
1968
1972
1976
1980
1984
1988
1992
1996
2000
2004
2008
2012
2016
2020
2024
Presidential caucuses and primaries
Democratic
2000
2008
2012
2016
2020
2024
Republican
2008
2012
2016
2020
2024
U.S. Senate elections
1876
1879
1883 sp
1885
1889
1891
1895
1897
1901
1903
1907
1909
1913
1913 sp
1914
1918
1920
1924
1924 sp
1926
1930
1932
1932 sp
1936
1938
1942
1942 sp
1944
1948
1950
1954
1956
1960
1962
1966
1968
1972
1974
1978
1980
1984
1986
1990
1992
1996
1998
2002
2004
2008
2010
2014
2016
2020
2022
2026
2028
U.S. House of Representatives elections
1876
1878
1880
1882
1884
1886
1888
1890
1892
1894
1896
1898
1900
1902
1904
1906
1908
1910
1912
1914
1916
1918
1920
1922
1924
1926
1927
1st sp
1928
1930
1932
1934
1936
1938
1940
3rd sp
1941
4th sp
1942
1944
1st sp
1946
1948
1950
1952
1954
1956
1958
1960
1962
1964
1966
1968
1970
1972
1974
1976
1978
1980
1982
1983
6th sp
1984
1986
1988
1990
1992
1994
1996
1998
2000
2002
2004
2006
2008
2010
2012
2014
2016
2018
2020
2022
2024
4th sp :
State government
General elections
2010
2014
2018
2020
2022
Gubernatorial elections
1876
1878
1880
1882
1884
1886
1888
1890
1894
1896
1898
1900
1902
1904
1906
1908
1910
1912
1914
1916
1918
1920
1922
1924
1926
1928
1930
1932
1934
1936
1938
1940
1942
1944
1946
1948
1950
1952
1954
1956
1958
1962
1966
1970
1974
1978
1982
1986
1990
1994
1998
2002
2006
2010
2014
2018
2022
2026
Secretary of State elections
2022
Attorney General elections
2014
2018
2022
Treasurer elections
2022
Colorado State Board of Regent elections
2016
Senate elections
2013 (recall)
2014
2016
2018
2020
2022
2024
House of Representatives elections
2018
2020
2022
2024 :
Ballot measures
List of Colorado ballot measures
1893
2
1972
8
1974
1
1982
1
1992
2
2000
20
2004
36
2006
38
41
42
43
44
E
F
G
H
I
J
K
2008
46
47
48
49
50
51
52
54
58
59
L
2010
62
2012
64
2018
A
2020
B
C
EE
113
114
2022
125
126
FF
2023
HH
II
2024
79
80
I
J
127
128
129
131 :
Colorado Springs
Local elections
2019
Mayoral elections
1995
1997 sp
1999
2003
2007
2011
2015
2019
2023 :
Denver
Mayoral elections
2003
2007
2011
2015
2019
2023 :
El Paso County
Local elections
2018 :
Pueblo
Mayoral elections
2023–24 :
vte :
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 | Winner | Winner | Winner | Winner | Runner(s)-up | Runner(s)-up | Runner(s)-up | Runner(s)-up | Runner(s)-up | Others | Others | Ref |
| Year | Candidate | Party | Party | Votes | % | Candidate | Party | Party | Votes | % | Votes | % | Ref |
| 1918 | Lawrence C. Phipps | | Republican | 107,726 | 49.49% | John F. Shafroth | | Democratic | 104,347 | 47.94% | 5,606 | 2.58% | |
| 1924 | Lawrence C. Phipps* | | Republican | 159,698 | 50.19% | Alva B. Adams | | Democratic | 139,660 | 43.89% | 2,772 | 0.87% | |
| 1924 | Lawrence C. Phipps* | | Republican | 159,698 | 50.19% | Morton Alexander | | Farmer–Labor | 16,039 | 5.04% | 2,772 | 0.87% | |
| 1930 | Edward P. Costigan | | Democratic | 180,028 | 55.85% | George H. Shaw | | Republican | 137,487 | 42.65% | 4,826 | 1.50% | |
| 1936 | Edwin C. Johnson | | Democratic | 299,376 | 63.45% | Raymond Sauter | | Republican | 166,308 | 35.25% | 6,143 | 1.30% | |
| 1942 | Edwin C. Johnson* | | Democratic | 174,612 | 50.23% | Ralph Lawrence Carr | | Republican | 170,970 | 49.19% | 2,014 | 0.58% | |
| 1948 | Edwin C. Johnson* | | Democratic | 340,719 | 66.79% | Will Nicholson | | Republican | 165,069 | 32.36% | 4,333 | 0.85% | |
| 1954 | Gordon Allott | | Republican | 248,502 | 51.32% | John A. Carroll | | Democratic | 235,686 | 48.68% | | | |
| 1960 | Gordon Allott* | | Republican | 389,428 | 53.75% | Robert Lee Knous | | Democratic | 331,752 | 45.79% | 3,351 | 0.46% | |
| 1966 | Gordon Allott* | | Republican | 368,307 | 58.02% | Roy Romer | | Democratic | 266,198 | 41.93% | 332 | 0.05% | |
| 1972 | Floyd Haskell | | Democratic | 457,545 | 49.41% | Gordon Allott* | | Republican | 447,957 | 48.37% | 20,581 | 2.22% | |
| 1978 | William L. Armstrong | | Republican | 480,801 | 58.69% | Floyd Haskell* | | Democratic | 330,148 | 40.30% | 8,307 | 1.01% | |
| 1984 | William L. Armstrong* | | Republican | 833,821 | 64.25% | Nancy E. 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

* 2002 Allard vs. Strickland
* 2008 Udall vs. Schaffer
* 2014 Gardner vs. Udall
* 2020 Hickenlooper vs. Gardner

### Class 3

| Year | Winner | Winner | Winner | Winner | Winner | Runner(s)-up | Runner(s)-up | Runner(s)-up | Runner(s)-up | Runner(s)-up | Others | Others | Ref |
| Year | Candidate | Party | Party | Votes | % | Candidate | Party | Party | Votes | % | Votes | % | Ref |
| 1914 | Charles S. Thomas | | Democratic | 102,037 | 40.30% | Hubert Work | | Republican | 98,728 | 38.99% | 11,433 | 4.52% | |
| 1914 | Charles S. Thomas | | Democratic | 102,037 | 40.30% | Benjamin Griffith | | Progressive | 27,072 | 10.69% | 11,433 | 4.52% | |
| 1914 | Charles S. Thomas | | Democratic | 102,037 | 40.30% | J. C. Griffiths | | Socialist | 13,943 | 5.51% | 11,433 | 4.52% | |
| 1920 | Samuel D. Nicholson | | Republican | 156,577 | 54.52% | Tully Scott | | Democratic | 112,890 | 39.31% | 17,706 | 6.17% | |
| 1924 (sp) | Rice W. Means | | Republican | 159,353 | 50.17% | Morrison Shafroth | | Democratic | 138,714 | 43.67% | 2,012 | 0.63% | |
| 1924 (sp) | Rice W. Means | | Republican | 159,353 | 50.17% | Charles T. Philip | | Farmer–Labor | 17,542 | 5.52% | 2,012 | 0.63% | |
| 1926 | Charles W. Waterman | | Republican | 149,585 | 50.25% | William Ellery Sweet | | Democratic | 138,113 | 46.39% | 9,997 | 3.36% | |
| 1932 (sp) | Karl C. Schuyler | | Republican | 207,540 | 48.76% | Walter Walker | | Democratic | 206,475 | 48.51% | 11,619 | 2.73% | |
| 1932 | Alva B. Adams | | Democratic | 226,516 | 51.91% | Karl C. Schuyler* | | Republican | 198,519 | 45.50% | 11,304 | 2.59% | |
| 1938 | Alva B. Adams* | | Democratic | 262,786 | 58.24% | Archibald A. Lee | | Republican | 181,297 | 40.18% | 7,126 | 1.58% | |
| 1942 (sp) | Eugene Millikin | | Republican | 191,517 | 56.12% | James A. Marsh | | Democratic | 143,817 | 42.14% | 5,926 | 1.74% | |
| 1944 | Eugene Millikin* | | Republican | 277,410 | 56.06% | Barney L. Whatley | | Democratic | 214,335 | 43.31% | 3,143 | 0.64% | |
| 1950 | Eugene Millikin* | | Republican | 239,724 | 53.25% | John A. Carroll | | Democratic | 210,442 | 46.75% | | | |
| 1956 | John A. Carroll | | Democratic | 319,872 | 50.22% | Daniel I. J. Thornton | | Republican | 317,102 | 49.78% | | | |
| 1962 | Peter H. Dominick | | Republican | 328,655 | 53.58% | John A. Carroll* | | Democratic | 279,586 | 45.58% | 5,203 | 0.85% | |
| 1968 | Peter H. Dominick* | | Republican | 459,952 | 58.55% | Stephen McNichols | | Democratic | 325,584 | 41.45% | | | |
| 1974 | Gary Hart | | Democratic | 471,688 | 57.23% | Peter H. Dominick* | | Republican | 325,526 | 39.50% | 26,957 | 3.27% | |
| 1980 | Gary Hart* | | Democratic | 590,501 | 50.33% | Mary Estill Buchanan | | Republican | 571,295 | 48.7% | 11,346 | 0.97% | |
| 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

* 2004 Salazar vs. Coors
* 2010 Bennet vs. Buck
* 2016 Bennet vs. Glenn
* 2022 Bennet vs. O'Dea