READING THIS ENTRYElections & ballots
How to interpret this record
Colorado Voting Rules 2026: Primary, Registration, Early and Mail Voting
A ballot brings together several decisions that share an election date but may follow different rules. The office, jurisdiction and stage of the election tell you what each choice means.
Start with the office and the place
An election record describes a particular office or question in a particular jurisdiction. A statewide contest is different from a congressional district, a city council seat or a school district. An address can help connect those boundaries, but a ZIP code alone is not a guarantee of one exact ballot. Use the election authority’s own ballot lookup to confirm the final choices for a voter.
Separate a filing from a ballot appearance
A campaign-finance filing tells you that a financial record exists. It does not, by itself, establish that the person qualified for the November ballot. A primary participant, withdrawn candidate and certified general-election candidate can all leave public records. Read the election stage and the source label before treating a directory as a current candidate list. Registered write-in candidates are a separate category whose rules depend on the jurisdiction.
Read the full elections & ballots guide →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.
Make your voting plan
ColoradoDates for November 3
Download calendar ↓Partial coverage: only the dated entries below have been checked. Confirm other deadlines and exceptions with your election office.
| Action | Date | Details and source |
|---|---|---|
| Register online | 5 days left | Register online by this date to receive a ballot by mail; later in-person voting options remain. Official source ↗ |
| Register by mail | 5 days left | Register by mail or agency by this date to receive a mailed ballot. Official source ↗ |
| Early voting begins | Passed | Required voter service centers begin opening; check exceptions and county hours. Official source ↗ |
| Return ballot | 13 days left | County clerk must receive domestic ballots by 7 p.m.; military/overseas rules differ. Official source ↗ |
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.
Not established by this source
The current EAC/NCSL comparison profile does not provide a complete statewide RCV rule field. Electionpedia does not infer one.
Not established by this source
Eligibility, filing, and counting rules can be election-specific. Use the official state election website.
Read the election notice
The primary-system field above is published. A complete contest-by-contest threshold rule is not.
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 ↗