Colorado's 1st Senate district

Colorado's 1st Senate district is one of 35 districts in the Colorado Senate. It has been represented by Republican Byron Pelton since 2023. Prior to redistricting the district was represented by Republicans Jerry Sonnenberg and Greg Brophy.

Geography
District 1 covers much of the Eastern Plains in the state's northeastern corner, including all of Cheyenne, Elbert, Kit Carson, Lincoln, Logan, Morgan, Phillips, Sedgwick, Washington, and Yuma Counties and parts of Weld County. Communities in the district include Julesburg, Holyoke, Sterling, Brush, Fort Morgan, Eaton, Kersey, Lochbuie, Hudson, Keenesburg, Ault, Akron, Wray, Yuma, Burlington, Limon, Elizabeth, Ponderosa Park, and Cheyenne Wells.

The district is located entirely within Colorado's 4th congressional district, and overlaps with the 48th, 63rd, 64th, and 65th districts of the Colorado House of Representatives. It borders the states of Wyoming, Nebraska, and Kansas.

2022
Colorado state senators are elected to staggered four-year terms; under normal circumstances, the 1st district holds elections in midterm years. The 2022 election is the first held under the state's new district lines.