Colorado law overhauls county commissioner redistricting, but only 3 counties now fit

Colorado has enacted a statewide rewrite of county commissioner redistricting rules that bars sitting commissioners from serving on map-drawing commissions, extends the rules to home-rule counties and creates new court-challenge, transparency and lobbying-disclosure requirements. But the law’s direct effect in the next decennial map cycle appears narrower than its statewide framing: the legislature’s fiscal note says only Arapahoe, El Paso and Weld counties currently elect county commissioners by district, meaning those three counties would be the ones required to use the new framework after the 2030 census under current law.

HB 26-1038, the “County Commissioner Redistricting Integrity Act,” was prepared as a final act on June 3. The measure responds to the Colorado Supreme Court’s 2025 ruling in League of Women Voters of Greeley v. Board of County Commissioners of Weld County, which held that home-rule counties still must comply with state redistricting statutes.

The clearest practical target is Weld County, where a 2023 redistricting fight drew legal threats after county officials argued the earlier state law did not bind Weld because it is a home-rule county. The Supreme Court later rejected that position, affirming standing and an implied private right of action and ordering Weld County to complete redistricting under state procedures in time for its next election.

The new law goes beyond the 2021 framework. It requires county boards to appoint independent commissions made up equally of members aligned with the state’s two largest parties and unaffiliated members, prohibits current county commissioners from serving, requires a public application process and 30 days’ notice before appointments, and lets any qualified county elector sue over an adopted plan. The law also bars off-record communications about map content between commissioners, staff and redistricting commissioners outside public meetings, requires redistricting lobbyists to disclose compensation and clients to the secretary of state, and requires counties to maintain a website for map submissions, comments and records explaining the commission’s rationale.

The competitiveness rules also become more specific. Under the act, each commission must adopt a public “composite formula” measuring competitiveness as a percentage, publish that formula at least 72 hours before adopting it, and then try first to maximize highly competitive districts and then moderately competitive districts, so long as other legal criteria are met. In bill-summary testimony, supporters said that could materially change how counties justify their maps because earlier county processes considered competitiveness without a standardized formula and the new approach would bring county line-drawing closer to Colorado’s state redistricting system.

How much those changes alter actual maps may vary by county. Colorado’s nonpartisan fiscal note says the bill affects only counties that elect commissioners by district and identifies Arapahoe, El Paso and Weld as the relevant counties. Earlier reporting by The Colorado Sun found those same three counties were where commissioner district boundaries mattered most electorally because most other Colorado counties elect commissioners countywide even when commissioners must live in geographic districts.

The public record suggests Weld may remain the likeliest source of pushback. Weld County’s 2026 legislative tracker lists HB 26-1038 under an “Amend” position, indicating county officials sought changes rather than supporting the bill outright. I did not find equally clear public positions from Arapahoe or El Paso counties in the records reviewed, and the Senate committee hearing summary I reviewed showed support testimony from the League of Women Voters of Colorado.

The immediate statewide impact appears limited, but the stakes in those counties are not. In the next cycle, the law is positioned to determine who shapes commissioner maps in three large counties where district boundaries can affect which party wins office. What remains unclear is whether new home-rule or county-control challenges will emerge before 2031, or whether lawmakers will revisit the framework before the next census-driven round of county maps.