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Cannabis & Marijuana Rental Rules in Colorado 2026

Landlord ban authority, possession and home-grow limits, medical patient housing rules, and federal Section 8 restrictions in Colorado.

Adult-Use Legal Effective 2012
2 oz Adult-use possession limit
6 plants Home cultivation
No Medical patient housing protection
Federal baseline (uniform in Colorado): Cannabis remains a Schedule I controlled substance under 21 U.S.C. § 812(c) Schedule I(c)(10) regardless of Colorado's legalization status. HUD PIH Notice 2014-21 (re-issued PIH 2017-13) requires Public Housing Authorities to deny admission to public housing or HCV (Section 8) for any household member illegally using a controlled substance, including cannabis. Landlords may prohibit smoking of any substance as a private property interest in any state.

Colorado was one of the first states to legalize recreational cannabis, and that history shapes how tenants read their rights. But legalization did not strip landlords of control. Amendment 64 (Colo. Const. art. XVIII, sec. 16), the 2012 measure that made recreational use legal for adults 21 and older, contains an explicit carve-out: a person who owns or controls property may prohibit the possession, cultivation, use, or sale of marijuana on that property. That single clause is why a landlord in a fully legal state still holds nearly the same authority a landlord in a prohibition state would.

The practical rule for Colorado owners is simple: your lease decides. If the lease is silent, you generally cannot stop a tenant from using cannabis in the unit. If the lease bans it clearly, that ban is enforceable in court like any other lease term. The complications come from cultivation, smoke migration in multi-unit buildings, and one hard federal line that overrides state law entirely, federally assisted housing.

Colorado Cannabis Legal Status

Colorado is classified as Adult-Use Recreational Legal (effective 2012). The governing statute is Colo. Const. art. XVIII § 16 (Amendment 64, 2012).

Landlord Authority in Colorado

Landlords retain ban authority.

Colo. Const. art. XVIII § 16(6)(d): nothing in this section requires any property owner to allow consumption or cultivation. Landlord may ban explicit in constitution.

Cannabis is legal in Colorado, but that is a tenant's right, not a lease right

Recreational cannabis has been legal in Colorado for adults 21 and older since voters passed Amendment 64 in 2012 (Colo. Const. art. XVIII, sec. 16). Medical marijuana came earlier, under Amendment 20 in 2000 (art. XVIII, sec. 14). Under Amendment 64, an adult may possess and use cannabis privately and may cultivate up to six plants, with no more than three flowering at one time.

None of that is a right against a landlord. Amendment 64 draws a clear line: legalization limits what the state can criminalize, not what a private property owner can prohibit in a lease. The same amendment that legalized the drug expressly preserved an owner's authority to ban possession, cultivation, use, and sale on the property. So in Colorado the legal question is never "is cannabis legal?", it plainly is, but "what does this lease say?"

A landlord's authority to ban smoking and cultivation

Colorado landlords may prohibit cannabis smoking, vaping, and cultivation in a rental unit, and may go further and ban possession entirely. A ban on growing is especially common and easy to justify: indoor cultivation drives humidity that breeds mold, tempts tenants to cut ventilation holes or cover windows, and spikes electricity use where the owner pays utilities. The six-plant right under Amendment 64 belongs to a person growing on property they own or control; it does not override a lease clause forbidding cultivation.

Smoking bans are equally enforceable and can cover tobacco, vaping, and marijuana in the same clause. The catch is that the restriction has to be in writing. If the lease says nothing about smoking or cannabis, a landlord generally cannot enforce a ban after the fact, the tenant's default right to use a legal product in their home controls. Put the prohibition in the lease or a signed addendum before move-in.

Writing an enforceable lease clause

Vague language is where Colorado landlords lose. "No smoking" alone can be argued to exclude vaping or edibles-related activity, and "no illegal drugs" is weak when the drug is legal under state law. Draft the clause to name each thing you intend to prohibit: smoking and vaping of any substance, cannabis in all forms, and cultivation of any number of plants. Specify where the ban applies, the unit, balconies, common areas, and the grounds.

Because Colorado has no statewide mandatory smoking-disclosure form, you are not required to use a state document; you simply have to state the policy in the lease. Watch local rules, though. Some municipalities, including Denver and Boulder, have smoke-free multi-unit housing ordinances that can independently restrict smoking in apartment buildings, so a city rule may reinforce or expand your own clause.

Enforcement: cure notices and eviction

When a tenant violates a written no-cannabis or no-smoking clause, the usual path is a 10-day notice to cure or quit under C.R.S. 13-40-104. The tenant can fix the violation, stop smoking, remove plants, within the cure period and keep the tenancy. A lease breach like this normally does not qualify for the faster three-day track.

The three-day substantial-violation notice under C.R.S. 13-40-107.5 is reserved for conduct that endangers people or property, or criminal activity carrying a potential sentence of 180 days or more that has been declared a public nuisance. Ordinary personal cannabis use in violation of a lease rarely meets that bar. Treating a routine smoking violation as a substantial violation is a common and costly mistake, an improper notice gets the eviction dismissed. Document the breach, serve the correct 10-day notice, and escalate only if the underlying conduct is genuinely dangerous or criminal.

Federally assisted housing overrides state legality

The one place Colorado's legalization does not reach is federally assisted housing. Cannabis remains a Schedule I controlled substance under the federal Controlled Substances Act (21 U.S.C. 812), and that federal status controls in public housing and the Section 8 Housing Choice Voucher program regardless of Amendment 64.

HUD guidance requires public housing agencies to deny admission to households where a member uses a controlled substance, and it permits termination of tenancy for drug-related activity, which includes marijuana even when the tenant holds a Colorado medical card. Owners renting to voucher holders should understand that the program rules, not the state constitution, govern cannabis on the premises. And note the flip side for any owner: because cannabis is not a protected class under fair-housing law, neither Colorado nor federal law requires you to accommodate recreational or medical marijuana use as a disability accommodation.

Medical Patient Housing Rules in Colorado

Colorado does not have statewide medical patient housing protection.

Medical cannabis patients in Colorado may be treated identically to recreational users by landlords. There is no state-law anti-discrimination requirement; the federal Schedule I framework controls. Some local jurisdictions may have ordinances providing limited protection, check the city or county where the rental unit is located.

Section 8 / HCV in Colorado, The Federal Trap

HUD PIH 2014-21 mandatory denial applies in Colorado. Even though Colorado has legalized adult-use cannabis, a Public Housing Authority in Colorado must deny admission to any household where a member illegally uses a controlled substance, and cannabis remains federal-illegal. Existing Section 8 tenants who use cannabis may face termination at PHA discretion, though termination is not mandatory like denial is.

The practical impact: a tenant holding a Housing Choice Voucher who tests positive for cannabis or self-discloses use during recertification can lose their voucher in Colorado, regardless of any state cannabis legalization or medical card status. This is the single most common point of confusion for tenants in adult-use states.

Cannabis Rental Compliance in Major Colorado Cities

City-level landlord risk profiles often track cannabis-related lease enforcement. View the eviction-risk and tenant-law profile for the largest Colorado rental markets:

Denver Colorado Springs Aurora Fort Collins Lakewood Thornton

Sources & Methodology

Related Guides for Colorado Landlords

← Colorado Eviction Risk Overview Lawful Eviction Reasons Section 8 / HCV Landlord Guide Landlord Insurance & Hazards Fair Housing Protected Classes Tenant Rights Summary

This overview is grounded in Colorado's governing authorities: Amendment 64 (Colo. Const. art. XVIII, sec. 16) and Amendment 20 (art. XVIII, sec. 14); the Colorado Landlord and Tenant Act at C.R.S. Title 38, Article 12; the eviction notice statutes at C.R.S. 13-40-104 and 13-40-107.5; and the federal Controlled Substances Act (21 U.S.C. 812) with HUD program rules for federally assisted housing. Statutes, city ordinances, and HUD guidance change; verify the current text and consult a Colorado landlord-tenant attorney before drafting lease clauses or serving notices. This is general information, not legal advice.

Frequently Asked Questions

Can a Colorado landlord ban marijuana even though it is legal?

Yes. Amendment 64 (Colo. Const. art. XVIII, sec. 16) legalized recreational cannabis but expressly lets a property owner prohibit possession, cultivation, and use on the property. The ban must be written into the lease to be enforceable.

What happens if the lease says nothing about cannabis or smoking?

If the lease is silent, a Colorado landlord generally cannot enforce a cannabis or smoking ban. The restriction has to appear in the lease or a signed addendum before it can be enforced, so add it at move-in rather than after a problem arises.

Can a tenant grow the six plants Amendment 64 allows in a rental?

Only if the lease permits it. The six-plant home-grow right (three flowering at once) applies to property the grower owns or controls, and a lease clause banning cultivation overrides it. Cultivation bans are common because indoor growing causes mold, ventilation damage, and high utility use.

How do I evict a tenant for violating a no-cannabis clause?

Serve a 10-day notice to cure or quit under C.R.S. 13-40-104 for an ordinary lease violation. The three-day substantial-violation notice under C.R.S. 13-40-107.5 is only for conduct that endangers people or property or qualifying criminal activity, which routine personal use rarely meets.

Does a medical marijuana card give a tenant extra rights?

No. A Colorado medical card (under Amendment 20) does not require a landlord to allow cannabis use or cultivation, and it does not defeat a written lease ban. Cannabis is not a protected class, so fair-housing law does not require accommodating medical use.

Can Section 8 or public housing tenants use cannabis in Colorado?

No. Cannabis stays a Schedule I substance under federal law (21 U.S.C. 812), so federally assisted housing must prohibit it regardless of state legality. HUD rules require denying admission for controlled-substance use and allow termination for drug-related activity, including marijuana.

Federal authority: 21 U.S.C. § 812; HUD PIH 2014-21. State authority: Colo. Const. art. XVIII § 16 (Amendment 64, 2012). Last updated October 24, 2026. For informational purposes only, not legal advice. Cannabis law is rapidly evolving and federal/state conflict creates significant compliance risk; consult a licensed Colorado attorney before making a lease, screening, or eviction decision involving cannabis.