Pre-18 voter registration in Colorado
In Colorado 75,765 people turn 18 every year.
Coloradans can pre-register before turning 18.
pre-register before turning To register to vote in Colorado, you must be: 15 years old.
That means all eligible seniors, juniors, sophomores and most freshmen in your high school can register to vote today and vote at 18.
Learn more about the voter registration gap in Colorado.
High school students can help one another get ready to vote.
Next Steps!
How to Register to Vote in Colorado
Upcoming Statewide or Federal Elections:
- Nov 3rd, 2026 - Colorado General Election (Register by Nov 3rd, 2026)
Useful Links:
- Registration Form - Download the paper registration form for Colorado.
- Registration Status - Check if you are already registered, your polling place, and more from your state’s voter registration website.
- Fair Elections Center - Learn about conducting a registration drive in Colorado.
- Vote 411 - A nonpartisan resource to help you register, preview your ballot, and find key election information from the League of Women Voters.
- VoteRiders - Find out what forms of ID you can use to register and vote, and get help getting a valid form of ID.
Full Registration Details
By Mail: ID Requirements
To submit a voter registration application by mail in Colorado, you must provide your Colorado driver's license number OR state ID number, if you have one. If you do not have either of these ID numbers, you must instead provide the last four digits of your Social Security number.
If you have not been issued any of these ID numbers, indicate this on the form. Colorado will assign you a unique identification number.
By Mail: Eligibility Requirements
To register in Colorado you must:
be a United States citizen
be a Colorado resident for at least 22 days immediately before the election in which you intend to vote, UNLESS that election is a presidential general election. In this case, you may be a resident for less than 22 days and cast a provisional ballot in person for president and vice president candidates ONLY
be at least 15 years old, and you must be at least 18 on or before Election Day to be eligible to vote
not be serving a sentence of detention or confinement for a felony conviction
By Mail: New Voter Instructions
If you are registering to vote for the first time in your county and submit your registration application by mail, federal law requires you to provide a COPY of proof of identification with your application OR show acceptable documentation when you vote. Acceptable forms of identification include a current and valid photo ID OR a current utility bill, bank statement, government check, paycheck, or government document that shows your name and address. More information about these requirements is available on the National Voter Registration Form.
Online Instructions
To register online in Colorado, you need to provide at least ONE of the following: Colorado driver’s license number, Colorado ID card number, OR the last four digits of your Social Security number. If you don’t have a Colorado driver’s license, Colorado ID card, or Social Security number, you can still submit a voter registration application by mail.
More information here.
Colorado High School Educators!!!
Support your students’ voter registration effort with our free toolkit.
Colorado Requirements for High School Voter Registration
The county clerk and recorder shall train and supervise the high school deputy registrars.
The county clerk and recorder shall issue sufficient materials to each high school deputy registrar for the registration or preregistration of all eligible students, employees, and other persons at the high school which the high school deputy registrar serves.
About this information
This page presents a curated compilation of voting and election information, specifically geared toward high school students, their families, and educators.
Information about deadlines and voting laws is retrieved via the Democracy Works Elections API and was last retrieved on Jul 6th, 2026; the API compiles election guidance from official government sources and other vetted data providers, and details may change over time. Information concerning requirements for high schools is based on The Civics Center’s analysis of State Requirements for High School Voter Registration and was last updated on Jun 22nd, 2026.
Information about youth turning 18 each year is from the U.S. Census, and information on the number of 18-year-olds who have not yet registered is based on applying TCC’s analysis of Census data and state voter files. We also provide links to trusted resources, including VoteRiders (for voter ID information) and Fair Elections Center (for information about laws governing voter registration drives).
These pages are offered for guidance only and are not intended as legal advice. Please consult state election officials or an attorney if you have questions about any particular situation. We hope you find this useful. To cite our resources and original research, please provide links and/or cite The Civics Center.
© 2026 The Civics Center
