Denver Elections: How Local Voting and Ballot Measures Work

Denver's local election system operates under a unique combination of the Denver City and County Charter, Colorado state election law, and home rule authority that gives Denver voters direct control over a wide range of municipal decisions. This page explains how Denver elections are structured, how ballot measures originate and are decided, and where the boundaries of local versus state authority fall. Understanding these mechanics matters for residents engaging with budget decisions, zoning changes, charter amendments, and city leadership.

Definition and scope

Denver conducts its own municipal elections as a consolidated city and county — a status established under Article XX of the Colorado Constitution, which grants Denver home rule authority over local affairs. The Denver Clerk and Recorder's Office administers all municipal elections, including elections for Mayor, City Council, City Auditor, Clerk and Recorder, and school board, as well as ballot measure elections.

Denver holds regular municipal elections in odd-numbered years, with the primary election in March and the runoff election in May. This schedule is distinct from Colorado's general election calendar, which runs in even-numbered years. Special elections can be called by Denver City Council at other times for specific ballot measures, charter amendments, or special district questions.

The Denver City and County Charter defines the legal framework for these elections. State election law under Colorado Revised Statutes Title 1 governs voter registration, mail ballots, and certain conduct requirements, while the Charter governs candidate eligibility, term lengths, and local initiative processes.

Scope and coverage: This page covers elections administered within the City and County of Denver. Suburban municipalities — including Aurora, Lakewood, Thornton, Westminster, and Arvada — hold independent municipal elections under their own charters or state statutory frameworks and are not covered here. Denver Public Schools board elections, while administered through the Denver Clerk and Recorder, operate under separate school district governance and are addressed only in passing. For the broader structure of Denver's governing bodies, see Denver City and County Structure.

How it works

Denver's election process moves through five structured stages:

1. Candidate filing — Candidates for municipal office file petitions and required documentation with the Denver Clerk and Recorder. Most city offices require a petition with a minimum number of valid registered-voter signatures collected within the district or city.
2. Mail ballot distribution — Denver conducts elections entirely by mail ballot. The Clerk's office mails ballots to all active registered voters approximately 3 weeks before the election date, consistent with Colorado's Voter Access and Modernized Elections Act (C.R.S. § 1-7.5-107).
3. Ballot drop-off and return — Voters return ballots by mail or at staffed drop-off locations. At least 1 drop box is required per 30,000 active registered voters under Colorado law (C.R.S. § 1-5-102.9).
4. Canvass and certification — After the close of polls, the Denver Election Division conducts a canvass — a formal audit of ballot counts — and certifies results within a statutory window.
5. Runoff elections — If no candidate for Mayor or other citywide office secures more than 50 percent of the vote in the primary, the top 2 vote-getters advance to a runoff held approximately 8 weeks later.

For detailed guidance on participating in elections, ballot measure processes, and public comment periods that precede ballot referrals, see the pages on the Denver Initiative and Referendum Process and Denver Public Comment and Participation.

Common scenarios

Candidate elections vs. ballot measure elections present the two fundamental categories of Denver local voting. Candidate elections fill offices including all 13 City Council seats (11 district seats plus 2 at-large seats), the Mayor, the Auditor, and the Clerk and Recorder. Ballot measure elections determine policy questions, charter amendments, bond authorizations, and tax changes.

The most frequent ballot measure scenarios include:

• Charter amendments — Changes to Denver's governing document require a two-thirds vote of City Council to refer to the ballot, followed by a simple majority vote of Denver electors.
• General obligation bonds — Capital funding for infrastructure, parks, and public facilities is authorized by voters through bond elections. Denver's 2017 Elevate Denver bond package totaled $937 million and was approved by voters in November 2017. For more on how bonds function within Denver's budget structure, see Denver Bonds and Capital Funding.
• Initiated ordinances — Denver residents can place ordinances directly on the ballot by collecting petition signatures equal to at least 5 percent of the total votes cast for Mayor in the last preceding election (Denver City Charter, Article V).
• Referred measures — City Council may refer ordinances and resolutions to voters for approval without a petition process.
• Special district elections — Metro districts and improvement districts within Denver boundaries may hold separate elections on mill levy questions; these are administered under state law rather than the Denver Charter.

Decision boundaries

Understanding which body makes which decisions is essential for tracking Denver's electoral outcomes.

Voters decide: Charter amendments, bond authorizations, initiated ordinances, tax rate changes (including those governed by the Taxpayer's Bill of Rights, TABOR, Colorado Constitution Article X, Section 20), and the election of all citywide and district offices.

City Council decides without a voter vote: Ordinary ordinances, budget appropriations within existing revenues, zoning changes, and most administrative policy. Council also decides whether to refer discretionary measures to the ballot — a power governed by the Denver City Council rules and the Charter.

The Mayor decides: Executive appointments, veto of Council ordinances (subject to Council override by two-thirds vote), and administrative direction of city departments including the Denver Police Department and Denver Public Works.

State law preempts local decisions in areas outside Denver's home rule authority. Elections for state offices (Governor, state legislature, U.S. Congress), statewide ballot measures, and judicial retention votes appear on Denver ballots but are administered under state law by the Colorado Secretary of State, not the Denver Clerk and Recorder. The relationship between Denver's home rule powers and state authority is addressed further on the Denver State Government Relationship page.

For a broader orientation to how Denver's governmental structure connects elections, policy, and service delivery, the Denver Metro Authority home page provides an overview of the topics covered across this reference site.

References

• Denver Clerk and Recorder's Office — Elections Division
• Denver City and County Charter — Article V (Initiative and Referendum)
• Colorado Revised Statutes Title 1 — Elections
• Article XX, Colorado Constitution — Home Rule for Cities and Towns
• Colorado Taxpayer's Bill of Rights (TABOR), Article X, Section 20, Colorado Constitution
• Colorado Secretary of State — Elections
• Elevate Denver Bond Program — City and County of Denver