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.
While Colorado was once considered a swing state, it has shifted significantly to the left over the past decade and is now regarded as solidly Democratic at both the federal and state levels. Democrats currently hold all statewide offices, both U.S. Senate seats, and strong majorities in both chambers of the Colorado General Assembly, while the stateâÂÂs U.S. House delegation is evenly split. In 2014, Republican Cory Gardner narrowly defeated Democratic incumbent Mark Udall for the U.S. Senate. As the state continued trending Democratic, GardnerâÂÂthen the only Republican holding major statewide officeâÂÂlost his 2020 re-election bid to Democrat John Hickenlooper by a significant margin. In late 2024, Hickenlooper announced he would seek re-election but indicated that the campaign would be his final run for the Senate.
To move forward to the primary, candidates had to petition onto the ballot or achieve 30% or more at the Colorado Democratic Party State Assembly. John Hickenlooper was the only candidate to petition onto the primary ballot. All other candidates went through the State Assembly process. Julie Gonzales was the only candidate to achieve 30% or more.
Italics indicate a withdrawn candidate.
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