Colorado sets no minimum age requirement for a medical marijuana card, but the rules get stricter the younger the patient is. Adults 21 and older can apply with a single physician’s certification. Patients aged 18 to 20 usually need two certifications from two different practices. Anyone under 18 must apply through a parent or legal guardian who registers as their caregiver, with two provider certifications and a notarized consent form.
Adults 21 and Older
If you’re 21 or older, one healthcare provider needs to certify that you have a qualifying medical condition. You submit that certification, your Colorado ID, and the application fee to the state’s Medical Marijuana Registry. That’s the entire threshold.
Since anyone 21 or older can already buy recreational marijuana in Colorado, the medical card is optional at this age. People still get one for lower taxes, higher purchase limits, and access to products or strengths that aren’t sold recreationally.
Patients Aged 18 to 20
This is the age bracket where Colorado added scrutiny. If you’re 18, 19, or 20 and applying for the first time on or after January 1, 2022, you need certifications from two different healthcare providers at two different medical practices.1Colorado Department of Public Health and Environment. About the Colorado Medical Marijuana Registry Application Both providers must independently confirm you have a qualifying condition. The two-provider requirement repeats every year at renewal.
There is one exception. If you already held a registry card before you turned 18, you only need a single provider certification going forward.2Colorado General Assembly. HB21-1317 Regulating Marijuana Concentrates The state treats you as an established patient rather than a new applicant.
Purchase limits are tighter too. Most medical patients can buy up to eight grams of concentrate per day; patients aged 18 to 20 are capped at two grams, unless they had a card before turning 18.3Colorado General Assembly. SB23-081 Access to Medical Marijuana The card matters more for this group than any other, since they can’t buy recreationally yet.
Minors Under 18
Colorado allows patients under 18 to use medical marijuana, but the entire process runs through a parent or legal guardian. A minor cannot hold a card independently or visit a dispensary alone.
Caregiver Requirement
Every minor patient must have at least one parent or legal guardian registered as their primary caregiver with the state. The caregiver is the person who buys the marijuana at the dispensary and manages the patient’s use, and that caregiver must be a Colorado resident.4Colorado Department of Public Health and Environment. Medical Marijuana Registry Caregivers Since December 2020, both parents or guardians of a minor patient can serve as caregivers at the same time, which is an exception to the usual one-caregiver-per-patient rule.5Legal Information Institute. Colorado Code of Regulations 5 CCR 1006-2-9 – Primary Care-Giver-Patient Relationship and Primary Care-Giver Rules
Two Certifications and Notarized Consent
All minor patients must see two healthcare providers and submit two separate certifications confirming a qualifying condition.1Colorado Department of Public Health and Environment. About the Colorado Medical Marijuana Registry Application The application must also include a notarized minor consent form signed by the parent or guardian. If a second parent lives in Colorado, that parent has to sign the consent form as well.6Colorado Department of Public Health and Environment. Medical Marijuana Registration Tips The parent or guardian also uploads the minor’s certified birth certificate and their own Colorado ID.
Qualifying Conditions at Any Age
Age alone doesn’t get you a card. You still need a qualifying condition, and Colorado sorts these into two categories.
Debilitating conditions include cancer, glaucoma, HIV or AIDS, cachexia, persistent muscle spasms (including from multiple sclerosis), seizures (including epilepsy), severe nausea, and severe pain. Only a physician with an MD or DO can certify a patient for a debilitating condition.7Colorado Department of Public Health and Environment. Medical Marijuana Registry Providers
Disabling conditions include PTSD, autism spectrum disorder, and any condition for which a physician could prescribe an opioid. These can be certified by a broader set of providers, including physician assistants, advanced nurse practitioners, dentists, podiatrists, and optometrists, as long as they have prescriptive authority and an unrestricted DEA certification.7Colorado Department of Public Health and Environment. Medical Marijuana Registry Providers The opioid-alternative category is broad and effectively covers many chronic pain situations that don’t fall neatly under the other diagnoses.
What It Costs
The state application fee is $52, non-refundable, and due each time you apply, including at renewal.1Colorado Department of Public Health and Environment. About the Colorado Medical Marijuana Registry Application Households at or below 185% of the Federal Poverty Level can request a fee waiver.
The $52 only covers state processing. Provider consultations typically run $100 to $300 out of pocket, and insurance rarely covers them because marijuana remains federally illegal. Applicants in the 18-to-20 bracket and parents applying for a minor should budget for two consultations rather than one.
What the Card Does Not Cover
A Colorado medical marijuana card protects you from state criminal penalties when you follow the program’s rules. It does not override federal law, and that gap matters in a few areas that catch patients off guard regardless of age.
Colorado does not require private employers to accommodate medical marijuana use. The Colorado Supreme Court ruled in 2015 that because marijuana remains illegal under federal law, using it, even with a valid medical card, does not qualify as a lawful activity under the state’s off-duty conduct protections. Employers can test for marijuana and terminate employment over a positive result, even when the use happened off the clock.
A card also does not protect residents of federally subsidized housing. The U.S. Department of Housing and Urban Development has said that because of the federal prohibition, it cannot admit or retain cannabis users in the public housing program, medical patients included.
Marijuana remains a Schedule I controlled substance under federal law as of early 2026. A rescheduling process to Schedule III is underway following an executive order, but no final rule has taken effect. Until it does, a state medical card provides no shield against federal enforcement, and marijuana use can affect federal background checks, security clearances, immigration proceedings, and gun ownership eligibility.