Is Microdosing Mushrooms Legal in Colorado? Home Growing, Driving, Sharing

Yes, microdosing mushrooms is legal in Colorado for adults 21 and older, under the Natural Medicine Health Act that voters approved as Proposition 122 in November 2022 and the legislature refined through Senate Bill 23-290.¹ You can possess psilocybin mushrooms, grow them at home within limits, use them in private, and share them with other adults. What you cannot do is sell them, consume them in public, drive after using them, carry them onto federal land, or assume your lease and your employer have to tolerate any of it. The protections are real, but they are bounded, and getting a boundary wrong turns a legal activity into a criminal charge.

Who the Law Covers and What “Personal Use” Means

You have to be 21. The age threshold applies equally to possession, use, cultivation, and sharing.¹ Anyone younger who possesses or uses psilocybin commits a drug petty offense, with a first conviction punishable by up to a $100 fine or up to four hours of substance-use education, and additional community service for later convictions.²

For adults who meet the age requirement, the statute shields personal use from criminal penalties, civil fines, detention, search, arrest, and asset forfeiture. Colorado did not set a specific gram limit. Instead, “personal use” is defined as the amount a person needs for their own consumption, including quantities grown or held to share with other adults in contexts like counseling, spiritual guidance, or community-based healing.¹ The flexibility works well for microdosing, where individual needs vary. The flip side is that very large quantities can still invite scrutiny if the amount suggests commercial intent.

One point catches people out: the law only protects naturally occurring psilocybin and psilocin. Synthetic psilocybin and synthetic analogs are excluded from the definition of “natural medicine.”² A lab-synthesized version of psilocybin is still treated as a Schedule I controlled substance under Colorado’s drug laws. Your microdose has to come from actual mushrooms.

Growing Mushrooms at Home

Home cultivation is legal, but on specific terms. You must grow on property you own or where the owner has given permission. The growing area cannot exceed 12 feet by 12 feet. And the space must be enclosed and locked so no one under 21 can get in.³

Violating any of those rules is a drug petty offense with a fine of up to $1,000.⁴ That is ten times the fine for public consumption, and it reflects how seriously the state takes the security requirements. A padlock on a closet door satisfies the law. An open shelf in a shared apartment does not.

Where You Can Actually Take a Dose

Microdosing is legal in private spaces, not public ones. Openly consuming natural medicine in any public area is a drug petty offense, carrying a fine of up to $100 and up to 24 hours of community service.² Parks, sidewalks, restaurants, and bars all count. The practical reality of microdosing makes this less of a daily issue than it might seem, since most people take sub-perceptual doses at home, but the legal line is simple: consume in private.

Private does not automatically mean your home is fair game if you rent. The Natural Medicine Health Act does not override a landlord’s right to prohibit the use or cultivation of natural medicine through lease terms.¹ If your lease has a controlled-substance clause, that clause still applies to psilocybin regardless of state decriminalization.

Driving Is Where Microdosers Get Caught

Colorado’s DUI statute applies to all controlled substances, and the law makes clear that being legally entitled to use a substance is not a defense. A DUI involving psilocybin carries the same penalties as an alcohol DUI: a misdemeanor for a first offense, escalating to a Class 4 felony after three or more prior convictions.⁵

Unlike alcohol, there is no established blood-level threshold for psilocybin impairment. Law enforcement relies on Drug Recognition Experts trained to identify impairment from any substance, including psychedelics.⁶ The standard is whether the substance affects you “to the slightest degree” so that you are less capable of safe driving. With microdoses, the amounts are intentionally sub-perceptual. Proving that to an officer or a court after the fact is another matter. The safest practice is simply not driving on a day you dose.

Sharing With Friends vs. Selling

You can give mushrooms to another adult 21 or older. You cannot sell them. The statute protects sharing “without remuneration,” and that term is interpreted broadly: any exchange of value counts, including cash, goods, services, or an inflated price on another item bundled with the mushrooms. You also cannot give mushrooms away as part of a business promotion, and paid advertising related to sharing natural medicine is prohibited. The law notes that such advertising can be used as evidence of illegal commercial activity.¹

Legitimate services alongside personal use are allowed. Paying for genuine harm-reduction services, therapy, or other support services connected to natural medicine use is permitted, as is maintaining a website and sharing educational materials.¹

Crossing into actual sales is where the consequences become severe. Unlicensed manufacturing of natural medicine products using hazardous substances is a Level 2 drug felony, which carries a presumptive sentence of four to eight years, and an aggravated range of eight to sixteen.⁴⁷ The difference between a gift and a felony can come down to whether any value changed hands.

Your Job and Your Landlord Are Not Bound by the Law

The Natural Medicine Health Act does not require employers to permit or accommodate psilocybin use.⁸ Employers can keep drug-free workplace policies, test for psilocybin, and discipline or terminate employees who test positive. There is no equivalent to the Lawful Off-Duty Activities protections that apply to some marijuana situations. An employer that fires you for a positive psilocybin test is on solid legal ground.

Landlords have similar authority. If your lease includes a drug-free or controlled-substance clause, microdosing or cultivating at home could violate the lease and lead to eviction, even though the activity is decriminalized under state law. Read your lease before you set up a grow space.

Where Colorado’s Protections Stop: Federal Law

Psilocybin remains a Schedule I controlled substance under federal law, which classifies it as having no accepted medical use and a high potential for abuse.⁹ Colorado’s decriminalization does not change that classification and cannot shield you from federal enforcement. For a microdoser, the conflict shows up in four concrete places.

Federal Land

National parks, national forests, military installations, federal courthouses, and post offices in Colorado all sit under federal jurisdiction. Possessing psilocybin on any of them can lead to federal prosecution regardless of your state-level protections.¹⁰ Colorado contains significant federal land, especially in the mountains, and the boundary is not always obvious on a hiking trail.

Firearms

Federal law makes it a crime for an “unlawful user of or addicted to any controlled substance” to possess a firearm or ammunition. A knowing violation is a felony punishable by up to 15 years in prison.¹¹ Because psilocybin is still federally controlled, anyone who microdoses regularly faces a direct conflict with firearm ownership. The Supreme Court is considering the issue in United States v. Hemani during its 2025-26 term, which challenges the constitutionality of the drug-user firearm prohibition. Until that case is decided, the federal ban remains enforceable. If you own firearms and microdose, this is not a theoretical risk.

Federally Assisted Housing

If you live in public housing or receive Section 8 assistance, federal housing law requires property managers to deny admission to any household with a member who is illegally using a controlled substance.¹² Psilocybin use is illegal federally, which makes it illegal controlled-substance use for housing purposes. Property managers also have authority to terminate tenancy for ongoing use. Colorado’s framework does not override that.

Taking Mushrooms Out of State

Transporting any Schedule I substance across state lines falls under federal drug trafficking statutes, which carry penalties far more severe than simple possession. Driving into a neighboring state with no comparable decriminalization also exposes you to that state’s criminal laws. Colorado’s protections stop at the state border.

Federal employees, military personnel, and anyone holding a security clearance face the same reality. The federal government does not recognize Colorado’s personal-use framework, and psilocybin use can jeopardize clearances, employment, and professional standing in any federally regulated field.

1
Colorado Secretary of State. Colorado Revised Statutes Article 170 – Natural Medicine Health Act
2
Justia. Colorado Code 18-18-434 – Offenses Relating to Natural Medicine and Natural Medicine Product – Definitions
3
Colorado Secretary of State. 2022 Nov 8 General Proposition 122
4
Colorado General Assembly. SB23-290 Natural Medicine Regulation and Legalization
5
Justia. Colorado Code 42-4-1301 – Driving Under the Influence
6
Colorado Department of Transportation. Magic Mushrooms May Be Decriminalized, but Driving After Use Is Illegal
7
Justia. Colorado Code 18-1.3-401.5 – Drug Felonies Classified – Presumptive and Aggravated Penalties – Legislative Intent
8
Colorado Secretary of State. Colorado Revised Statutes Article 170 – Limitations
9
Drug Enforcement Administration. Psilocybin
10
Office of the Law Revision Counsel. 21 U.S. Code 812 – Schedules of Controlled Substances
11
Office of the Law Revision Counsel. 18 U.S. Code 922 – Unlawful Acts
12
Office of the Law Revision Counsel. 42 U.S. Code 13661 – Screening of Applicants for Federally Assisted Housing