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voteinCO
Voter Guide - nonpartisan

Voting in Colorado, November 3, 2026

This guide links to official sources and lists key dates we've checked by hand. Last verified: September 25, 2026. Always confirm with coloradosos.gov/pubs/elections before you act. We are not an election authority.

Key dates

Last verified: September 25, 2026
Online and mail registration deadline
Monday, October 26, 2026Register or update by this date online at GoVoteColorado.gov or by mail to be mailed a ballot. After that, you can still register and vote in person at a Voter Service and Polling Center through 7 p.m. on Election Day.
Source: Colorado Secretary of State, 2026 Election Calendar
In-person voting at Voter Service and Polling Centers
Monday, October 19 to Tuesday, November 3, 2026Vote in person, or register and vote the same day. Counties must have their required centers open by Monday, October 19, 2026, though those centers do not have to open on Sundays or Saturday, October 24, 2026. Locations and hours vary by county.
Source: Colorado Secretary of State, 2026 Election Calendar
Mail ballot return deadline
Tuesday, November 3, 2026, 7 p.m.Your county clerk must receive your ballot by 7 p.m. on Election Day; postmarks do not count. Ballots are mailed Friday, October 2 to Friday, October 9, 2026. The state suggests mailing yours back by Monday, October 26, 2026; after that, use a drop box or Voter Service and Polling Center.
Source: Colorado Secretary of State, Mail-in Ballots FAQs
Election Day poll hours
Tuesday, November 3, 2026, 7 a.m. to 7 p.m.If you are in line by 7 p.m., you can still vote. Voter Service and Polling Centers also offer same-day registration.
Source: Colorado Secretary of State, 2026 Election Calendar

Official links