COLORADO — The Colorado Supreme Court ruled on June 29, 2026, that five proposed ballot initiatives aimed at redrawing congressional districts violated the state constitution. The court stated that the measures addressed multiple subjects, which is not permitted under the state's constitution, and the decisions were unanimous.

This ruling prevents the implementation of new congressional maps through these initiatives for the 2028 and 2030 elections. Three of the defeated measures had been led by Democrats, while Republicans led two others.

Chief Justice Monica M. Márquez said, "Changing long-settled law by modifying the timing, frequency, criteria, and entity responsible for congressional redistricting represents a significant change beyond the proponents' stated central purposes." She added that undoing the state's independent redistricting commission would be "a seismic shift to Colorado's longstanding redistricting process enshrined in the state constitution."

Colorado's U.S. House delegation is evenly split between four Democrats and four Republicans. This balance was established by a map drawn by the state's independent redistricting commission following the 2020 census. A constitutional amendment would be required to draw different districts in Colorado before the next census.

Democratic-aligned groups had spent over $2 million on the Colorado ballot measures, primarily for signature gathering efforts. Adam Kincaid, president of the National Republican Redistricting Trust, said, "Complete and total victory in Colorado!"

Curtis Hubbard, a spokesperson for Coloradans for a Level Playing Field, commented on the ruling. "While Trump and his MAGA allies regularly sidestep the law and ignore voters, efforts to respond have once again been dealt a legal setback over a technicality," Hubbard said.