You can register to vote:

• Anytime in person at a county voter registration office or Voter Service and Polling Center, including Election Day (NOTE: If you register in person after the 8th day before an election you must visit one of the Voter Service and Polling Centers in order to vote your ballot. You will not receive a mail ballot).
• No later than 8 days before an election by mail or online at www.govotecolorado.com
• No later than 22 days before an election or through a Voter Registration Drive

Colorado now has automatic voter registration! When you interact with certain agencies, such as the DMV, you usually provide information like your name, address, date of birth, etc. This information is then used to register you to vote in Colorado. The county clerk will verify that they have the complete record to register you to vote. If your record is complete, the county clerk will send a notice to you that you are registered to vote. You can return the notice to either decline to be registered or to affiliate with a political party. If you do not decline to be registered within 20 days after the notice is mailed, and the form is not returned as undeliverable, you are then registered to vote.

https://www.vote411.org/colorado

govotecolorado.gov

Track my ballot

Colorado voters can now sign up for BallotTrax - a system that will allow you to track your ballot from sent to accepted. Sign up here https://colorado.ballottrax.net!