2026 Colorado Senate election

{{Infobox election

| election_name = 2026 Colorado Senate election

| country = Colorado

| type = legislative

| ongoing = yes

| previous_election = 2024 Colorado Senate election

| previous_year = 2024

| election_date = November 3, 2026

| next_election = 2028 Colorado Senate election

| next_year = 2028

| seats_for_election = 18 of the 35 seats in the Colorado Senate

| majority_seats = 18

| image_size = x160px

| image1 = Colorado State Senator Robert Rodriguez in 2023.jpg

| leader1 = Robert Rodriguez
(term-limited)

| party1 = Colorado Democratic Party

| leader_since1 = September 8, 2023

| seats_before1 = 23

| seats_needed1 = {{steady}}

| seats_after1 =

| seat_change1 =

| popular_vote1 =

| percentage1 =

| swing1 = {{increase}} 7.30 pp

| image2 = Colorado State Senator Cleave Simpson in 2023.jpg

| leader2 = Cleave Simpson

| party2 = Colorado Republican Party

| leader_since2 = June 12, 2025

| seats_before2 = 11

| seats_after2 =

| seats_needed2 = {{increase}} 7

| seat_change2 =

| popular_vote2 =

| percentage2 =

| swing2 =

| map = 350px

| map_caption = Map of the incumbents:
{{legend0|#92C5DE|Democratic incumbent}} {{legend0|#0671B0|Democratic incumbent retiring or term-limited}}
{{legend0|#F48882|Republican incumbent}} {{legend0|#CA0120|Republican incumbent retiring or term-limited}}
{{legend0|#6D6D6D|Vacant}} {{legend0|#D3D3D3|No election}}

| title = President of the Senate

| before_election = James Coleman

| before_party = Democratic

| after_election =

| after_party =

| last_election1 = 12 seats, 56.35%

| last_election2 = 6 seats, 41.01%

| leaders_seat1 = {{nowrap|32nd–Denver}}

| leaders_seat2 = {{nowrap|6th–Alamosa}}

| 1blank = Seats up

| 1data1 = 11

| 1data2 = 6

}}

The 2026 Colorado Senate election is scheduled to be held on November 3, 2026. Voters in 18 out of the 35 districts of the state Senate will elect their representative for a four-year term.{{cite web|url=https://leg.colorado.gov/publications/senate-term-limits|title=Senate Term Limits|website=Colorado General Assembly}} This election will coincide with other Colorado elections of the same year and the biennial United States elections.

Background

File:2024 co pres sd.svg

In the 2024 US Presidential Election, Kamala Harris won 24 districts, while Donald Trump won 11. Republicans represented one district where Harris had won in 2024: District 30 (Harris +2.42%), represented by John Carson. Additionally, one Democrat, Nick Hinrichsen, represented District 3, which Trump won by 5.13%.

Retiring incumbents

=Democrats=

District 3: Nick Hinrichsen is retiring.{{cite news |last1=Bartolo|first1=James|title=Incumbent Pueblo state senator won't seek reelection. What's next for Pueblo Democrats?|url=https://www.chieftain.com/story/news/2025/06/05/pueblos-nick-hinrichsen-drops-out-of-senate-district-3-race/84048379007/ |access-date=June 9, 2025 |work=The Pueblo Chieftain |date=June 5, 2025}}
District 22: Jessie Danielson is term-limited.
District 25: Faith Winter is term-limited.
District 32: Robert Rodriguez is term-limited.
District 34: Julie Gonzales is term-limited.

=Republicans=

District 4: Mark Baisley is retiring to run for governor.{{cite news |last1=Birkeland |first1=Bente |title=Mark Baisley becomes second Republican state lawmaker to enter Colorado's 2026 race for governor |url=https://coloradosun.com/2025/03/03/mark-baisley-colorado-governor-2026/ |access-date=March 3, 2025 |work=The Colorado Sun |date=March 3, 2025}}

Summary of results by district

† - Incumbent term-limited or not seeking re-election

class="sortable wikitable" style="font-size:95%;line-height:14px;"

! District !! |{{Abbr|2024 Pres.|2024 Presidential election margin}}{{Cite web|title=Dave's Redistricting|url=https://davesredistricting.org/join/9b5ec272-1fba-4a7a-ac6c-f2dcb4c6d0ae|access-date=2025-06-09}} !! Incumbent !! colspan="2" | Party !! Elected Senator !! colspan="2" | Outcome

1st

| {{Shading PVI|R |44.4}}

| Byron Pelton

| style="background:{{party color|Republican Party (United States)}};"|

| Rep

| TBD

3rd

| {{Shading PVI|R |5.1}}

| Nick Hinrichsen†

| style="background:{{party color|Democratic Party (United States)}};"|

| Dem

| TBD