The 2026 United States Senate election in Colorado will be held on November 3, 2026, to elect a member of the United States Senate to represent the state of Colorado. Primary elections will be held on June 30, 2026. Incumbent Democratic senator John Hickenlooper, who was first elected in 2020, has stated that he plans to run for re-election. He has also said that this will be his last campaign for Senate.
November 3, 2026 | |||||||
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Democratic primary
Candidates
Declared
- Karen Breslin, college professor, candidate for U.S. Senate in 2022, and candidate for Colorado's 4th congressional district in 2024
- Julie Gonzales, state senator from the 34th district (2019–present)
- Brashad Hasley, software engineer
- John Hickenlooper, incumbent U.S. senator
Filed paperwork
- A.J. Zimpfer, accountant
Withdrawn
- Nichole Miner, college student
Endorsements
Karen Breslin
- Organizations
- Our Revolution Denver
- Track AIPAC
John Hickenlooper
- Organizations
- AIPAC
- End Citizens United
- Giffords
- J Street PAC
- Jewish Democratic Council of America
- Joint Action Committee for Political Affairs
- League of Conservation Voters Action Fund
- Population Connection
- 314 Action
Fundraising
| Campaign finance reports as of September 30, 2025 | |||
|---|---|---|---|
| Candidate | Raised | Spent | Cash on hand |
| Karen Breslin (D) | $65,845 | $51,702 | $14,143 |
| Brashad Hasley (D) | $7,749 | $37 | $7,712 |
| John Hickenlooper (D) | $6,481,472 | $4,482,366 | $3,641,189 |
| Anthony Zimpfer (D) | $3,708 | $230 | $3,478 |
| Source: Federal Election Commission | |||
Republican primary
Candidates
Declared
- Janak Joshi, former state representative from the 16th district (2011–2017) and candidate for Colorado's 8th congressional district in 2024
- George Markert, AI strategic advisor
Filed paperwork
- Dathan Jones, pastor
Potential
- Heidi Ganahl, former at-large member of the University of Colorado Board of Regents (2017–2023) and nominee for governor in 2022
Declined
- Brandi Bradley, state representative from the 39th district (2023–present)
Endorsements
George Markert
- U.S. representatives
- Tom Tancredo, former CO-06 (1999–2009)
Fundraising
| Campaign finance reports as of September 30, 2025 | |||
|---|---|---|---|
| Candidate | Raised | Spent | Cash on hand |
| Janak Joshi (R) | $147,499 | $35,444 | $112,055 |
| George Markert (R) | $119,482 | $63,678 | $55,804 |
| Source: Federal Election Commission | |||
Independent candidates
Candidates
Filed paperwork
- Clinton Roosevelt Dale
- Joshua William Kuebler
General election
Predictions
| Source | Ranking | As of |
|---|---|---|
| Inside Elections | Solid D | August 12, 2025 |
| The Cook Political Report | Solid D | October 14, 2025 |
| Sabato's Crystal Ball | Safe D | August 12, 2025 |
| Race To The WH | Safe D | September 4, 2025 |
See also
- 2026 Colorado gubernatorial election
- 2026 Colorado elections
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