Can You Drink at 18 in Colorado? Exceptions, Penalties, and DUI Rules

You can drink at 18 in Colorado only in a narrow set of situations, the main one being on private property with your parent or legal guardian present and consenting and the property owner’s permission. Outside those specific exceptions, anyone under 21 who possesses or consumes alcohol in Colorado is breaking the law.

The Parent and Private Property Exception

The exception most 18-year-olds actually encounter requires three things to be true at the same time. The property owner or legal possessor has to know about the drinking and consent to it. A parent or legal guardian of the underage drinker has to be physically present. And that parent or guardian has to consent.¹

All three. A phone call from a parent giving permission while you’re drinking at a friend’s house does not satisfy the statute. The parent needs to be there.

“Private property” is also narrower than it sounds. The statute excludes any business that holds or needs a liquor license, any establishment that sells alcohol, and any place that rents rooms or provides accommodations to the public. A hotel room, an Airbnb, or a restaurant’s private dining room will not qualify even with a parent sitting at the table.¹

Other Narrow Exceptions

A few other situations are carved out of the underage possession law. They are affirmative defenses, meaning you’d have to prove the exception applies if you’re charged.

Religious purposes protected by the First Amendment, such as sacramental wine during communion.¹
Alcohol in your system that came only from a medicinal or hygienic product like cough syrup or mouthwash, from confectionery containing small amounts of alcohol, or from any beverage with less than half a percent alcohol by weight.¹
Tasting (not drinking) alcohol as a required part of a culinary arts, food service, or restaurant management course at an accredited post-secondary school, under the direct supervision of an instructor at least 21 years old who keeps control of the alcohol at all times.¹

None of these creates a general right to drink socially at 18. The religious exception covers ceremonies, not a social gathering at a church.

Penalties for Underage Possession or Consumption

Underage possession or consumption of alcohol is an unclassified petty offense in Colorado. No jail time attaches to the charge itself, but the fines, programs, and driver’s license consequences get heavier with each conviction.¹

First offense: a fine of up to $100, or a substance abuse education program, or both. Your driver’s license can be revoked if you fail to complete a court-ordered assessment or program.
Second offense: a fine of up to $100, mandatory substance abuse education, a possible assessment with treatment, up to 24 hours of community service, and a six-month license revocation.
Third or subsequent offense: a fine of up to $250, a mandatory assessment with any recommended treatment, up to 36 hours of community service, and a 12-month license revocation.

Every conviction also carries an additional $25 surcharge that funds adolescent substance abuse prevention and treatment, which the court can waive for financial hardship.¹ License revocations are handled separately through the Colorado Division of Motor Vehicles.² For many teenagers, losing a license for six to twelve months hurts more than any fine.

Driving After Drinking Under 21

Drivers under 21 face a much stricter blood alcohol standard than adults. The adult DUI threshold is 0.08%, but any driver under 21 caught with a BAC between 0.02% and 0.05% commits a traffic infraction called Underage Drinking and Driving (UDD). A single drink can put you there.³

A first UDD offense is a class A traffic infraction. The court can order up to 24 hours of community service and may require an alcohol evaluation, education program, or treatment at your expense. A second or subsequent UDD jumps to a class 2 traffic misdemeanor. Above 0.05%, the regular DUI and DWAI statutes apply with their usual consequences.³

What Happens to Adults Who Provide the Alcohol

Giving, selling, or serving alcohol to anyone under 21 in Colorado is a class 2 misdemeanor, punishable by up to 120 days in jail and a fine of up to $750.⁴⁵ If the person is under 18, prosecutors can add a charge for contributing to the delinquency of a minor. An adult who hosts a house party where minors drink can also face a civil lawsuit if an intoxicated minor leaves and causes an accident.

Good Samaritan Immunity in an Overdose

Colorado’s Good Samaritan law gives immunity from arrest and prosecution for underage alcohol possession when someone reports an alcohol overdose emergency. The immunity covers both the caller and the person overdosing, but only if the report is made in good faith to 911, law enforcement, or a medical provider; the caller stays at the scene until help arrives; and the caller identifies themselves and cooperates with responders.⁶

The immunity applies only to the underage possession charge arising from the same incident. It does not shield anyone from unrelated charges, but it exists precisely so a possession worry never stops someone from calling for help.

1
Justia. Colorado Code 18-13-122 – Illegal Possession or Consumption of Ethyl Alcohol or Marijuana by an Underage Person
2
Colorado Department of Revenue. Alcohol and Drug Related Offenses
3
Justia. Colorado Code 42-4-1301 – Driving Under the Influence, Driving While Impaired, and Habitual User
4
Justia. Colorado Code 44-3-901 – Unlawful Acts – Exceptions – Definitions
5
Colorado State Board of Governors. Colorado Liquor Code – Article 3, Title 44
6
FindLaw. Colorado Code 18-1-711 – Immunity for Persons Who Suffer or Report an Emergency Drug or Alcohol Overdose Event