Elections
The Colorado 2026 congressional primary was held on June 30, 2026. General Election Day is November 3, 2026.
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Term end dates, party breakdown, and which seats are on the November ballot.
General Election · November 3, 2026
Quick Answer
Incumbent Sen. John Hickenlooper won the Democratic nomination over Julie Gonzales (52.8%–47.2%). Mark Baisley was unopposed for the Republican nomination.
November nominees
Mark Baisley
Won primary · 100.0%
John Hickenlooper
Won primary · 52.8%
Each won their own party's primary and advance to November 3, 2026 in a single-winner plurality contest.
Colorado has 1 U.S. House district rated a toss-up for 2026 (rating: Cook Political Report (June 2026)). These are among the seats most likely to decide control of the House.
All U.S. House seats in Colorado are on the 2026 ballot. Every House member runs for re-election every two years. View Colorado representatives →
Colorado's Class II Senate seat is up for election in 2026. The current senator is John Hickenlooper (D). Class II senators were last elected in 2020 and serve six-year terms.
Colorado holds separate party primaries. Voters registered with a party vote in that party's primary. Voters registered as independent or unaffiliated may choose which party's primary to vote in. You may only vote in one party's primary.
| June 30, 2026 | Primary Election (passed) |
| October 2026 | Voter registration deadlines (check your state) |
| November 3, 2026 | General Election |
| January 3, 2027 | 120th Congress convenes |
Registered party members vote in their own party's primary. Voters registered as independent or unaffiliated may choose which party's primary to vote in. Registration deadlines vary — most states require registration 15–30 days before the primary, though some offer same-day registration.
Check your registration status and find your polling place at vote.gov.
See All State Primary Dates
Compare Colorado's primary to other states' 2026 schedules.
Mark Baisley won the Republican nomination with 100.0% of the vote, and John Hickenlooper won the Democratic nomination with 52.8%. They advance to the general election on November 3, 2026.
The November 3, 2026 ballot features Mark Baisley (R) vs John Hickenlooper (D) for Colorado's U.S. Senate seat.
The Colorado 2026 congressional primary is June 30, 2026. The general election is November 3, 2026.
Registered party members vote in their own party's primary. Voters registered as independent or unaffiliated may choose which party's primary to vote in.
All U.S. House seats in Colorado are on the 2026 primary ballot. Additionally, the U.S. Senate seat (Class II) is up for election. The current senator is John Hickenlooper (D). Many states also hold primaries for governor and state legislature on the same day.
Colorado holds separate party primaries. Voters registered with a party vote in that party's primary. Voters registered as independent or unaffiliated may choose which party's primary to vote in. You may only vote in one party's primary.
Voter registration deadlines vary but are typically 15–30 days before the primary. Check the Colorado Secretary of State website or vote.gov for the exact deadline.
The 2026 general election is on Tuesday, November 3, 2026. This date is the same for all 50 states — it is always the first Tuesday after the first Monday in November in even-numbered years.
Colorado has 1 U.S. House district rated a toss-up by Cook Political Report (June 2026). Decided November matchups: CO-8 (Gabe Evans (R) vs Manny Rutinel (D)).
