2018 Colorado Senate election

2018 Colorado State Senate election

← 2016 November 6, 2018 2020 →
17 of the 35 seats in the Colorado Senate 18 seats needed for a majority
Majority party Minority party   Leader Leroy Garcia Kevin Grantham (term-limited) Party Democratic Republican Leader's seat District 3 District 2 Last election 17 18 Seats before 16 18 Seats won 19 16 Seat change 3 2 Popular vote 608,037 564,971 Percentage 50.3% 46.75% Seats up 6 10 Races won 9 8
Results:      Democratic gain      Democratic hold      Republican hold      No election
President of the Senate before election Kevin Grantham Republican Elected President of the Senate Leroy Garcia Democrat

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 2018 2022 Treasurer elections 2022 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 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 C 113 114 EE 2022 125 126 FF
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
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The 2018 Colorado State Senate elections took place as part of the biennial United States elections. Colorado voters elected state senators in 17 of the 35 districts in the state senate. State senators serve four-year terms in the Colorado State Senate. The Colorado Reapportionment Commission provides a statewide map of the state Senate here, and individual district maps are available from the U.S. Census here.

A primary election on June 26, 2018 determined which candidates appeared on the November 6 general election ballot. Primary election results can be obtained from the Colorado Secretary of State's website.^[1]

Following the 2016 state Senate elections, Republicans maintained effective control of the Senate with 18 members. Democratic state Senator Cheri Jahn switched from Democrat to unaffiliated on December 29, 2017.^[2] However, Sen. Jahn decided to still caucus with Democrats. In the 2018 election, Republicans defended 10 seats while Democrats defended 6 seats with Jahn's 1 Independent seat up for grabs.

To claim control of the chamber from Republicans, the Democrats needed to net 1 Senate seat while electing a Democrat to the Independent seat. The Democratic candidate won the Independent seat while Democrats netted 2 additional seats, giving the party majority status in the chamber. The results ultimately led to Democrats gaining a political trifecta for the first time since 2014.^[3]