You cannot legally buy psilocybin mushrooms in Denver. There is no dispensary, store, or licensed seller where adults can walk in and purchase them, and commercial sale remains a drug felony under Colorado law. What adults 21 and older can legally do is possess mushrooms for personal use, grow them at home within set limits, and receive them as a gift from another adult, so long as no money or anything of value changes hands. A state-licensed system of supervised healing centers is being built out, but it is not a retail model and no centers are widely operating yet.
What Adults 21 and Older Can Legally Do
Colorado voters passed Proposition 122, the Natural Medicine Health Act, in November 2022. It decriminalized personal possession, use, and cultivation of psilocybin and psilocin for adults 21 and older statewide, which includes Denver. The law protects specific activities from criminal prosecution, civil fines, asset seizure, and denial of rights under state or local law.
Possession for Personal Use
You can possess psilocybin for personal use in a private setting. The statute does not spell out a specific gram limit in its text. Instead, it defines “personal use” as the amount needed for personal ingestion, including what you would need to share with other adults in counseling or spiritual contexts. Practical limits are set through rulemaking by state agencies.
Growing at Home
You can grow psilocybin mushrooms at home for personal use. The cultivation area cannot exceed 12 feet by 12 feet, must be in a private residence, and must be locked so that no one under 21 can access it. Growing beyond that footprint, or growing for sale, remains a felony.
Receiving Mushrooms as a Gift
Another adult 21 or older can give you psilocybin, but only if no remuneration changes hands. The statute defines “remuneration” as anything of value. Selling, trading, bartering, or conditioning access on getting something in return is not a gift, it is a transaction, and the label people put on it does not change the legal analysis. If someone would only give you mushrooms because you gave them something else, that exchange is illegal.
Buying Spores
Psilocybin mushroom spores themselves do not contain psilocybin or psilocin, and the DEA has confirmed that ungerminated spores are not controlled substances under federal law. California, Georgia, and Idaho ban spores specifically. Colorado does not. You can legally buy spores here. Once those spores germinate and the resulting mushrooms begin producing psilocybin, the material becomes a controlled substance under federal law, though Colorado’s personal cultivation rules apply at the state level.
Why Buying From a Seller Is Still a Felony
Neither Denver’s 2019 city ordinance nor the statewide Natural Medicine Health Act created any legal pathway for commercial retail sales of psilocybin. Selling mushrooms for money is a drug felony in Colorado at any amount. Depending on quantity, penalties for unlawful distribution span multiple drug felony levels, with prison terms ranging from two years up to 32 years and fines reaching $1 million at the highest levels.
Public consumption is also prohibited unless you are in a location specifically licensed for it. The Act bans possession and use in schools, detention facilities, and public buildings. Open and public consumption is a drug petty offense carrying a fine of up to $100 and up to 24 hours of community service.
Healing Centers Are Not Dispensaries
The Natural Medicine Health Act created a licensing framework for healing centers, where adults will be able to consume psilocybin in a supervised setting with a trained facilitator. This is the only legal way money will change hands for psilocybin access in Colorado, and it does not look like a dispensary. You will not walk out with a bag of mushrooms. The model involves a preparation session, an on-site administration session, and follow-up integration, all guided by a licensed professional.
Colorado’s Natural Medicine Division within the Department of Revenue is accepting license applications for healing centers, cultivation facilities, manufacturers, and testing facilities, and a separate state division is processing facilitator licenses. As of early 2026, that licensing infrastructure is still being built out, and no healing centers are widely operating for public access yet.
Where Colorado’s Protections Stop
Psilocybin remains a Schedule I controlled substance under the federal Controlled Substances Act, in the same category as heroin and LSD. That federal status matters in several situations state decriminalization does not reach.
Federal Property
On federal land inside Colorado, including national parks, national forests, military installations, and federal courthouses, possession of any amount of psilocybin is a federal crime. A first offense for simple possession carries up to one year in prison and a minimum $1,000 fine. A second conviction can bring up to two years and a $2,500 minimum fine, and a third up to three years with a $5,000 minimum fine.
Denver International Airport
TSA operates under federal law. If a screener finds psilocybin in your carry-on or checked bag at DIA, the standard response is to call law enforcement. TSA has publicly documented incidents where screeners flagged psilocybin products and state police then confiscated them. Flying out of a decriminalized city offers no protection here.
Interstate Travel
Carrying psilocybin across state lines implicates federal trafficking statutes, which are far harsher than simple possession. This is true even when you are traveling between two states that have both decriminalized psilocybin at the state level.
Driving
Driving under the influence of psilocybin is illegal in Colorado, and officers enforce it. Colorado’s Drug Recognition Experts are trained to identify impairment from psychedelics. There is no standard blood test or per se limit for psilocybin, so DUI cases turn on observed impairment rather than a chemical threshold, which tends to make outcomes less predictable rather than easier to fight.
Employers and Professional Licenses
Your employer can still fire you for psilocybin use. No jurisdiction in Colorado, and no state in the country, has adopted employment protections for psilocybin users. Because the drug remains federally illegal, a workplace zero-tolerance policy can support discipline for off-duty use that is entirely legal under state law. Courts have consistently allowed this approach for other Schedule I substances.
Anyone holding a state professional license faces added exposure. Doctors, nurses, attorneys, and other licensees can be disciplined by their boards for using a federally controlled substance, even in a decriminalized state. Oregon has introduced legislation to shield licensed medical professionals from discipline for legal psilocybin use. Colorado has not. If your career depends on a professional license, the risk of psilocybin use runs well past criminal penalties.