Help build better election infrastructureIndependent. Public. Powered by you.
Donate
Help build better election infrastructure

We at Election.org want to build the best election infrastructure and need your help.

$10$20$100
Choose an amount Secure checkout through Stripe.
election.org
Election.orgPublic record
Search public records
Menu
Home/Election rules/Colorado
CO · sourced voting rules

How elections work
in Colorado

Rules that shape registration and voting, the officials responsible for administering them, and the gaps that still require an election-specific source.

Official election website ↗Who runs the election →

Make your voting plan

Colorado
Voter registration guideOfficial registration options Open my election officeOfficial voter services Deadlines and rulesCheck your state’s sources →

Dates for November 3

Download calendar

Partial coverage: only the dated entries below have been checked. Confirm other deadlines and exceptions with your election office.

Colorado · Sourced election dates

Checked 2026-10-16. Confirm local details and exceptions with your election office.

Background registration and voting policy
State policy snapshot · not legal advice

Registration, primary, and voting methods

These values preserve the wording in the March 2026 EAC/NCSL profile. Asterisks and qualifications are meaningful; confirm the current election notice before acting.

Primary systemOpen to unaffiliated voters
Registration deadline policy8 days before Election Day to receive mail ballot
Same-day registrationPermitted
Early in-person votingBegins 15 days before Election Day for general elections
No-excuse absentee votingPermitted; ballots are mailed to all active registered voters
Mail-ballot return policy7 p.m. on Election Day
RANKED-CHOICE VOTING

Not established by this source

The current EAC/NCSL comparison profile does not provide a complete statewide RCV rule field. Election.org does not infer one.

WRITE-IN RULES

Not established by this source

Eligibility, filing, and counting rules can be election-specific. Use the official state election website.

RUNOFF OR WIN THRESHOLD

Read the election notice

The primary-system field above is published. A complete contest-by-contest threshold rule is not.

OFFICIAL BALLOT ORDER

Address and election required

A statewide rules profile cannot establish a voter's complete local specimen ballot.

Source: U.S. Election Assistance Commission / NCSL State Election Profile for Colorado ↗ · published March 2026 · verified 2026-08-24. Confirm current election details ↗
RewatchThe People’s Election