This year’s filing deadline for candidates running for the U.S. House of Representatives in Colorado was March 18, 2026.
This year has the second-most contested primaries since 2014. In total, seven primaries — five Democratic and two Republican — are contested this year. In total, there were six contested primaries in 2024, eight in 2022, two in 2020, six in 2018, four in 2016, and three in 2014.