How to vote in Colorado in 2026
Every deadline, rule, and official link — kept simple. When you're ready, build a personal plan with calendar reminders in about a minute.
Key dates
- State Primary
- Tuesday, June 30, 2026
- General Election
- Tuesday, November 3, 2026
- Register online by
- Monday, October 26, 2026
- Register by mail by
- Monday, October 26, 2026(postmarked)
- Register in person by
- Tuesday, November 3, 2026
Deadlines shown are for the November 3, 2026 general election.
Register to vote
Online: 8 days before Election Day. By mail: Postmarked 8 days before Election Day. In person: Election Day (if voting in-person). Same-day registration available.
Online — the fastest way
A few minutes on the official site.
By mail
Print, sign, and mail the National Mail Voter Registration Form.
In person
At your local election office — or same-day at the polls.
Already registered? Double-check.
Vote by mail
Colorado runs all-mail elections — every registered voter automatically receives a ballot. No request needed: every registered voter automatically receives a mail ballot.
Returning it: Received by 7pm on Election Day. If you are dropping off your ballot in person or at a dropbox, you are allowed to cast your ballot if you’re in line by 7pm on Election Day.
Vote in person
Vote early where available (dates vary by county), or at your polling place on Election Day — Tuesday, November 3, 2026.
Quick answers
Can I register to vote online in Colorado?
Yes — Colorado has official online registration (deadline: Monday, October 26, 2026 for the general election). It usually takes a few minutes.
Do I need an excuse to vote by mail?
No — Colorado runs all-mail elections. Every registered voter automatically receives a ballot.
Can I register on Election Day?
Yes — Colorado offers same-day registration. Online: 8 days before Election Day. By mail: Postmarked 8 days before Election Day. In person: Election Day (if voting in-person). Same-day registration available.
When are the 2026 elections?
State Primary: Tuesday, June 30, 2026 · General Election: Tuesday, November 3, 2026
Turn this into your plan
Three questions, then every Colorado deadline lands on your calendar with reminders.
Make your voting planCompiled from official state sources, vote.gov, and Ballotpedia (2026 calendars). Rules occasionally change — when it matters, confirm with the Colorado election office. Found an error? Tell us.