List of United States senators from Colorado

Colorado was admitted to the Union on August 1, 1876 and elects U.S. senators to Senate Class 2 and Class 3. Its current U.S. senators are Democrat Michael Bennet (serving since 2009) and Republican Cory Gardner (serving since 2015), making it one of nine states to have a split United States Senate delegation.

Current delegation
Michael Bennet (D)
Cory Gardner (R)

List of senators

Class 2

Class 2 U.S. senators belong to the electoral cycle that was first elected just to finish the 46th United States Congress in the first elections of 1876, and were elected also in 1876 to the term beginning in 1877. The seat in recent years have been contested in 2002, 2008, and 2014. The next election will be in 2020.

 C

Class 3

Class 3 U.S. senators belong to the electoral cycle that was first elected to finish the 46th United States Congress and for the next Congress in the first elections of 1876. The seat in recent years have been contested in 1998, 2004, 2010, and 2016. The next election will be in 2022.

# Senator Party Dates in office Electoral history T T Electoral history Dates in office Party Senator #
Vacant August 1, 1876 –
November 15, 1876		 Colorado did not elect its Senators until three months after statehood. 1 44th 1 Colorado did not elect its Senators until three months after statehood. August 1, 1876 –
November 15, 1876		 Vacant
1
Henry M. Teller		 Republican November 15, 1876 –
April 17, 1882		 Elected in 1876. Elected in 1876.

Retired.		 November 15, 1876 –
March 3, 1879		 Republican
Jerome B. Chaffee		 1
Elected to next term in 1876 or 1877.

Resigned to become U.S. Secretary of the Interior.		 2 45th
46th 2 Elected in 1879.

Lost re-nomination.		 March 4, 1879 –
March 3, 1885		 Republican
Nathaniel P. Hill		 2
47th
2
George M. Chilcott		 Republican April 17, 1882 –
January 27, 1883		 Appointed to continue Teller's term.

Did not run to finish the term.
3
Horace Tabor		 Republican January 27, 1883 –
March 3, 1883		 Elected to finish Teller's term.

Retired.
4
Thomas M. Bowen		 Republican March 4, 1883 –
March 3, 1889		 Election date unknown.

Unknown if retired or lost re-election.		 3 48th
49th 3 Elected in 1885. March 4, 1885 –
March 3, 1909		 Republican
Henry M. Teller		 3
50th
5
Edward O. Wolcott		 Republican March 4, 1889 –
March 3, 1901		 Elected in 1889. 4 51st
52nd 4 Re-elected in 1891.
53rd
Re-elected in 1895.

Lost re-election.		 5 54th
55th 5 Re-elected January 20, 1897.[1] Silver Republican
56th
6
Thomas M. Patterson		 Democratic March 4, 1901 –
March 3, 1907		 Elected in 1901.

Retired.		 6 57th
58th 6 Re-elected in 1903.

Retired.		 Democratic
59th
7
Simon Guggenheim		 Republican March 4, 1907 –
March 3, 1913		 Elected January 16, 1907.

Retired.		 7 60th
61st 7 Elected January 19, 1909.

Died.		 March 4, 1909 –
January 11, 1911		 Democratic
Charles J. Hughes, Jr.		 4
  January 11, 1911 –
January 15, 1913		 Vacant
62nd
Elected to finish Hughes's term. January 15, 1913 –
March 3, 1921		 Democratic
Charles S. Thomas		 5
8
John F. Shafroth		 Democratic March 4, 1913 –
March 3, 1919		 Elected January 14, 1913.

Lost re-election.		 8 63rd
64th 8 Re-elected in 1914.

Lost re-election.
65th
9
Lawrence C. Phipps		 Republican March 4, 1919 –
March 3, 1931		 Elected in 1918. 9 66th
67th 9 Elected in 1920.

Died.		 March 4, 1921 –
March 24, 1923		 Republican
Samuel D. Nicholson		 6
68th
  March 24, 1923 –
May 17, 1923		 Vacant
Appointed to continue Nicholson's term.

Retired.		 May 17, 1923 –
November 30, 1924		 Democratic
Alva B. Adams		 7
Elected to finish Nicholson's term.

Lost renomination.		 December 1, 1924 –
March 3, 1927		 Republican
Rice W. Means		 8
Re-elected in 1924.

Retired.		 10 69th
70th 10 Elected in 1926.

Died.		 March 4, 1927 –
August 27, 1932		 Republican
Charles W. Waterman		 9
71st
10
Edward P. Costigan		 Democratic March 4, 1931 –
January 3, 1937		 Elected in 1930.

Retired.		 11 72nd
  August 27, 1932 –
September 26, 1932		 Vacant
Appointed to continue Waterman's term.

Lost election to finish Waterman's term.		 September 26, 1932 –
December 6, 1932		 Democratic
Walter Walker		 10
Elected to finish Waterman's term.

Lost election to next term.		 December 7, 1932 –
March 3, 1933		 Republican
Karl C. Schuyler		 11
73rd 11 Elected in 1932. March 4, 1933 –
December 1, 1941		 Democratic
Alva B. Adams		 12
74th
11
Edwin C. Johnson		 Democratic January 3, 1937 –
January 3, 1955		 Elected in 1936. 12 75th
76th 12 Re-elected in 1938.

Died.
77th
  December 1, 1941 –
December 20, 1941		 Vacant
Appointed to continue Adams's term.

Elected November 4, 1942 to finish Adams's term.[2]		 December 20, 1941 –
January 3, 1957		 Republican
Eugene Millikin		 13
Re-elected in 1942. 13 78th
79th 13 Elected to a full term in 1944.
80th
Re-elected in 1948.

Retired.		 14 81st
82nd 14 Re-elected in 1950.

Retired.
83rd
12
Gordon Allott		 Republican January 3, 1955 –
January 3, 1973		 Elected in 1954. 15 84th
85th 15 Elected in 1956.

Lost re-election.		 January 3, 1957 –
January 3, 1963		 Democratic
John A. Carroll		 14
86th
Re-elected in 1960. 16 87th
88th 16 Elected in 1962. January 3, 1963 –
January 3, 1975		 Republican
Peter H. Dominick		 15
89th
Re-elected in 1966.

Lost re-election.		 17 90th
91st 17 Re-elected in 1968.

Lost re-election.
92nd
13
Floyd Haskell		 Democratic January 3, 1973 –
January 3, 1979		 Elected in 1972.

Lost re-election.		 18 93rd
94th 18 Elected in 1974. January 3, 1975 –
January 3, 1987		 Democratic
Gary Hart		 16
95th
14
William L. Armstrong		 Republican January 3, 1979 –
January 3, 1991		 Elected in 1978. 19 96th
97th 19 Re-elected in 1980.

Retired.
98th
Re-elected in 1984.

Retired.		 20 99th
100th 20 Elected in 1986.

Retired.		 January 3, 1987 –
January 3, 1993		 Democratic
Tim Wirth		 17
101st
15
Hank Brown		 Republican January 3, 1991 –
January 3, 1997		 Elected in 1990.

Retired.		 21 102nd
103rd 21 Elected in 1992.

Changed parties March 3, 1995.		 January 3, 1993 –
January 3, 2005		 Democratic
Ben Nighthorse Campbell		 18
104th
Republican
16
Wayne Allard		 Republican January 3, 1997 –
January 3, 2009		 Elected in 1996. 22 105th
106th 22 Re-elected in 1998.

Retired.
107th
Re-elected in 2002.

Retired.		 23 108th
109th 23 Elected in 2004.

Resigned to become U.S. Secretary of the Interior.		 January 3, 2005 –
January 20, 2009		 Democratic
Ken Salazar		 19
110th
17
Mark Udall		 Democratic January 3, 2009 –
January 3, 2015		 Elected in 2008.

Lost re-election.		 24 111th
Appointed to finish Salazar's term. January 21, 2009 –
Present		 Democratic
Michael Bennet		 20
112th 24 Elected to a full term in 2010.
113th
18
Cory Gardner		 Republican January 3, 2015 –
Present		 Elected in 2014. 25 114th
115th 25 Re-elected in 2016.
116th
To be determined in the 2020 election. 26 117th
118th 26 To be determined in the 2022 election.
# Senator Party Years in office Electoral history T   T Electoral history Years in office Party Senator #
Class 2 Class 3

Living former senators

As of August 2020, there are seven living former senators from Colorado. The most recent senator to die was Bill Armstrong (served 1979–1991) on July 5, 2016, and was also the most recently serving senator to die.

Senator Term of office Date of birth (and age)
Gary Hart January 3, 1975 – January 3, 1987 (1936-11-28) November 28, 1936
Tim Wirth January 3, 1987 – January 3, 1993 (1939-09-22) September 22, 1939
Hank Brown January 3, 1991 – January 3, 1997 (1940-02-12) February 12, 1940
Ben N. Campbell January 3, 1993 – January 3, 2005 (1933-04-13) April 13, 1933
Wayne Allard January 3, 1997 – January 3, 2009 (1943-12-02) December 2, 1943
Ken Salazar January 3, 2005 – January 20, 2009 (1955-03-02) March 2, 1955
Mark Udall January 3, 2009 – January 3, 2015 (1950-07-18) July 18, 1950

See also

Notes
  1. "Teller in Colorado". The New York Times. January 21, 1897. p. 2.
  2. Byrd, p. 86.

References
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