Missouri Marijuana Laws (2026): Possession, Limits and Where to Buy

By James Buddsey · Updated November 4, 2026

Yes. Under Missouri marijuana laws, adults 21 and older can legally buy, possess and use up to 3 ounces of dried marijuana or its equivalent, and can grow up to six flowering plants at home with a state registration card. Adult-use cannabis has been legal under Article XIV of the Missouri Constitution since December 8, 2022, and as of October 2026 sales carry a 6% state tax plus up to 3% local tax.

Missouri voters approved medical marijuana in 2018 and adult use in 2022, both as constitutional amendments, so the core rules sit in the state constitution. This guide is for Missouri residents and visitors who want the actual rules as of October 2026, with links to the constitutional text and the state regulator behind each one. It is general information, not legal advice.

Missouri Cannabis Laws at a Glance

Is Marijuana Legal in Missouri?

Yes, for adults 21 and over. Missouri’s path to legalization ran through two ballot measures:

• 2018, medical: Voters adopted Amendment 2 on November 6, 2018, creating the medical marijuana program now found in Article XIV, Section 1 of the Missouri Constitution.
• 2022, adult use: Voters approved Amendment 3 on November 8, 2022. It amended Article XIV and added Section 2, which took effect on December 8, 2022, thirty days after the election.

The constitution defines a “consumer” simply as a person at least 21 years old. There is no residency requirement in that definition. The program is run by the Division of Cannabis Regulation (DCR) within the Department of Health and Senior Services.

Some things remain illegal for everyone: selling or giving cannabis to anyone under 21, unlicensed sales, smoking in public, and driving while impaired. Cannabis also remains illegal under federal law for adult use. See our federal marijuana law guide for the April 2026 rescheduling order and what it does and does not cover.

How Much Cannabis Can You Possess in Missouri

Adults 21 and older may purchase, possess and use 3 ounces or less of dried, unprocessed marijuana, or its equivalent, under Article XIV, Section 2.10(1)(a). The DCR’s adult-use FAQs state that up to 3 ounces may be bought in a single transaction and that a consumer may hold up to 3 ounces at any time. Edibles, vapes and concentrates count toward it through state equivalency rules.

Adults may also give away 3 ounces or less to another adult, as long as nothing is received in return. Giving or selling any amount to a person under 21 is not protected.

Penalties for going over the limit

The constitution sets a civil penalty scale for adults caught with more than 3 ounces but no more than twice the limit (6 ounces), under Section 2.10(6):

• First violation: civil infraction, fine up to $250, and forfeiture of the marijuana
• Second violation: civil penalty up to $500, plus forfeiture
• Third or later violation: misdemeanor, fine up to $1,000, plus forfeiture

Above twice the limit, the constitutional schedule no longer applies. Missouri’s general drug statute, RSMo 579.015, makes possession of more than 35 grams of marijuana a class D felony. Selling without a license remains a crime at any amount.

Under 21

A person under 21 caught with 3 ounces or less faces a civil penalty of up to $100 and forfeiture, and may choose up to four hours of drug education or counseling instead of the fine (Section 2.10(5)). Between 3 and 6 ounces, the penalty is up to $250, with up to eight hours of education or counseling as an alternative.

Where You Can and Cannot Use Cannabis in Missouri

Smoking marijuana in a public place, other than in an area licensed for that activity, carries a civil penalty of up to $100 under Section 2.10(4). The constitution does not define “public place,” so treat anywhere open to the public as off limits.

• Not protected anywhere public: Section 2.3(1)(i) leaves consumption of marijuana in a public place, not just smoking, outside the legalization protections, so eating an edible in public is not protected either.
• Tobacco-free zones: Section 2.3(1)(h) also leaves out smoking marijuana anywhere smoking tobacco is prohibited.
• Vehicles: Section 2.3(1)(f) leaves out smoking marijuana in a car, train, aircraft, motorboat or other motorized transport while it is being operated, and that applies to passengers as well as drivers.
• City rules: Under Section 2.5(6)(a), local governments may set the time and place where marijuana may be smoked in public areas, so check your city code.
• Private property: Owners, landlords and businesses may ban marijuana on property they own, lease, occupy or manage. However, a lease signed after December 8, 2022 may not stop a tenant from lawfully possessing and consuming marijuana by means other than smoking (Section 2.3(4)).
• Designated areas: Local governments may regulate the consumption of marijuana-infused products within designated areas (Section 2.5(6)(b)). Check city rules before assuming any on-site consumption is available.
• Workplaces: Employers do not have to permit or accommodate marijuana use and may discipline employees for working under the influence (Section 2.3(3)).
• Federal land: National forests, military bases and other federal property follow federal law, where adult-use cannabis is illegal.

Buying Cannabis in Missouri: Dispensaries, ID and Delivery

• Who can buy: Any consumer 21 or older. The DCR requires adult-use buyers to show a valid government-issued photo ID at the dispensary.
• Limit per visit: Up to 3 ounces of dried marijuana or its equivalent in one transaction.
• Delivery: The constitution lets comprehensive and microbusiness dispensaries deliver to any address the customer directs (Sections 2.2(4) and 2.2(18)). Availability depends on the store.
• Verify the license: The DCR publishes a verified dispensary locator listing licensed facilities.
• Local bans: Cities and counties may vote to prohibit microbusiness dispensaries, but only if at least 60% of voters approve at a November general election in a presidential year (Section 2.5(1)).

Medical Marijuana in Missouri

The medical program under Article XIV, Section 1 still runs alongside adult use and offers several advantages:

• Lower tax: medical sales are taxed at 4% of the retail price, compared with 6% plus any local tax for adult use.
• Higher limits: the state may not set a 30-day purchase limit below 6 ounces of dried marijuana or its equivalent, and the possession limit may not be lower than a 60-day supply. Patients who grow may keep up to a 90-day supply on property they control.
• Minor patients: a physician or nurse practitioner may certify a patient under 18 only with written consent from a parent or guardian, who holds the card and buys and administers the medicine.

Qualifying conditions include cancer, epilepsy, glaucoma, chronic severe pain, PTSD and other debilitating conditions certified by a physician or nurse practitioner. Patient ID cards are valid for three years at a $25 fee, adjusted for inflation. A patient cultivation card is also valid for three years; the DCR says its fee was reduced to $50 per application.

Section 1 also says a substantially equivalent card from another state can meet Missouri’s requirements and allow non-resident patients to buy at dispensaries as permitted by department rules. Confirm current procedures with DCR patient services before relying on an out-of-state card.

Growing Cannabis at Home in Missouri

Missouri allows home growing, but only with a registration card from the DCR. Under Section 2.4(24), an adult 21 or older with a personal cultivation card may grow:

• 6 flowering plants
• 6 nonflowering plants over 14 inches tall
• 6 clones under 14 inches tall

The rules that come with the card are strict. Plants and any marijuana over 3 ounces must be kept at one private residence, in an enclosed, locked space, and out of view from a public place. No more than 12 flowering plants may be kept at one residence at a time, even if several adults live there. The adult-use card costs $100 a year, adjusted for inflation, and is valid for 12 months. Medical patients with a cultivation card get the same plant counts, and caregivers growing for more than one patient are capped at 24 flowering plants.

Driving and Cannabis in Missouri

Driving under the influence of marijuana remains an offense. Missouri has no per se THC blood limit for adults. Section 2.3(1)(d) states that for a person 21 or older, a conviction may not rest solely on the presence of THC or THC metabolites; the state must show actual impairment. Consuming marijuana while operating a vehicle, and smoking marijuana in a moving vehicle, are also outside the constitution’s protections.

Crossing State Lines, Airports and Federal Property

• To neighboring states: Taking cannabis across any state line is illegal under federal law. That includes trips into Illinois, where adult use is also legal.
• Flying: The TSA follows federal law and refers cannabis found during screening to local police. Carrying cannabis on any flight, including from St. Louis or Kansas City, is illegal under federal law.

Missouri Cannabis Taxes in 2026

Adult-use purchases carry a 6% state tax on the retail price under Section 2.6(1). Local governments may add up to 3% more, but only with voter approval (Section 2.6(5)). Medical purchases are taxed at 4%, according to the DCR. Adult-use tax revenue funds veterans’ health care, addiction treatment grants and the public defender system.

What Changed in Missouri Cannabis Law Recently

• Intoxicating hemp ban (2026): Gov. Mike Kehoe signed HB 2641 on April 23, 2026. Starting November 12, 2026, the law treats hemp-derived cannabinoid products as marijuana, so they may be sold only by state-licensed marijuana businesses; for products the bill does not list, the state rules apply only while federal hemp restrictions are in effect. The federal hemp redefinition runs on a split schedule: it bans cannabinoids the plant cannot naturally produce, such as THC-O, on November 12, 2026, and its other restrictions, including on delta-8 made from CBD, start December 11, 2026.
• No marijuana measure on the 2026 ballot: The Secretary of State’s list of measures certified for November 3, 2026 includes no marijuana or hemp question.
• Medical card renewals (2025 to 2026): The DCR notes that medical ID cards issued on or after December 2, 2022 are now coming due for their first renewal under the three-year term.
• Federal rescheduling (2026): In April 2026 the Justice Department moved marijuana held under a state medical marijuana license to Schedule III. Missouri’s adult-use market remains under Schedule I while the broader DEA proceeding, stayed on September 29, 2026, is on hold.

Missouri Marijuana Laws FAQ

More State Cannabis Law Guides

Compare Missouri with its neighbors in our guides to Illinois, Oklahoma, Arkansas and Tennessee, browse all state cannabis law guides, or read our summary of federal marijuana law.

General information about Missouri cannabis law as of October 2026, not legal advice.