Missouri Cannabis Laws 2026: What's Legal for Adults and Patients

Missouri voters legalized recreational cannabis in November 2022 by passing Amendment 3, which added Article XIV, Section 2 to the state constitution. It took effect on December 8, 2022, and licensed dispensaries began adult-use sales in early 2023. Because it's written into the constitution, lawmakers can't simply repeal it. Changing it would take another statewide vote.

Here's what that means day to day, whether you're a Missouri mom or just visiting.

Is weed legal in Missouri?

Yes, for adults 21 and older. You don't need a medical card to buy from a licensed dispensary. Just bring a valid government ID showing you're 21+. Out-of-state visitors can buy too.

Medical cannabis has been legal since 2018 (Article XIV, Section 1), and patients 18+ with a state medical card get higher limits and a lower tax rate.

How much can you buy and carry?

Limit	Adults 21+	Medical patients
Purchase	Up to 3 ounces of flower (or the equivalent) per transaction	Up to 6 ounces of flower (or the equivalent) every 30 days
Possession	Up to 3 ounces on you	Up to the patient's 60-day supply

Missouri measures concentrates and edibles in "MMEs" (Missouri Marijuana Equivalency Units): 1 MME equals 3.5 grams of flower, 1 gram of concentrate, or 100 mg of THC in an infused product. A 3-ounce purchase limit works out to about 24 MMEs.

Where can you use it?

Private property, like your home, is the place. Article XIV specifically does not allow:

• Using cannabis in a public place (unless it's an area licensed for it)
• Smoking it anywhere smoking tobacco is banned
• Having it at a school, on a school bus, or on the grounds of a jail or prison
• Driving, or doing any task, while impaired

Landlords, hotels and other property owners can still ban smoking or growing on their property, so check your lease.

Can you grow cannabis at home?

Yes, with a state cultivation card. Adults 21+ can apply to the Division of Cannabis Regulation for a consumer personal cultivation card. It costs $100 a year (adjusted for inflation) and lets you grow:

• 6 flowering plants
• 6 non-flowering plants (over 14 inches)
• 6 clones (under 14 inches)

Plants must be at a private residence, in an enclosed, locked space that can't be seen from a public place. No more than 12 flowering plants are allowed at one home, no matter how many people there have cards. Anything you harvest beyond 3 ounces has to stay at that home.

Medical patients can add cultivation to their medical card with the same per-person plant limits. Two patients can share one grow space.

Getting a Missouri medical marijuana card

You'll need a certification from a licensed physician or nurse practitioner for a qualifying condition, then apply online through the Missouri Department of Health and Senior Services (DHSS) Division of Cannabis Regulation. Medical cards still make sense even with recreational legal:

• Lower tax: 4% on medical purchases, versus the 6% state adult-use tax plus local tax
• Higher limits: 6 ounces every 30 days instead of 3 ounces per trip
• Age: patients can be 18+ (minors with a parent or guardian as caregiver)

Current application fees are on the DHSS fee schedule.

Taxes on cannabis in Missouri

Adult-use purchases carry a 6% state marijuana tax, plus regular state and local sales tax. Cities and counties can add up to 3% more if local voters approve it. Medical purchases are taxed at 4%.

Driving, work and housing

• Driving: Driving while impaired by cannabis is still illegal and is treated like drunk driving.
• Work: Article XIV doesn't make employers allow cannabis. They can ban it at work, discipline you for working impaired, and keep drug-testing policies. Medical patients have some extra protections, but it's still worth reading your employee handbook.
• Housing: Landlords can prohibit smoking and growing on their property.
• Federal property: Cannabis is still illegal under federal law, so it's not allowed in national parks, on military bases or on other federal land.

What happens if you have too much?

Carrying more than 3 ounces but no more than 6 ounces is a civil infraction, not a crime, at first:

• First time: up to a $250 fine, and the cannabis is taken
• Second time: up to $500
• Third time or more: a misdemeanor, with a fine up to $1,000

Larger amounts, selling without a license, and anything involving minors can bring criminal charges.

Old marijuana convictions

Article XIV requires many past non-violent marijuana offenses (generally possession of up to 3 pounds) to be expunged, which means removed from your record, not just pardoned. Courts handled most of these automatically after 2022. If you think a conviction of yours qualifies and it's still on your record, the court that handled the case or a local legal aid group can help.

Is anything changing in 2026?

As of October 2026, no marijuana measure is on Missouri's November 3, 2026 ballot, according to the Secretary of State's list of certified measures. A proposed "Marijuana Regulations Amendment" was cleared to gather signatures but did not make the ballot. Lawmakers continue to debate related issues like intoxicating hemp products, so we'll update this guide when the rules change.

Where to buy legally

Missouri has more than 200 state-licensed dispensaries. Every dispensary in our Missouri dispensary directory is matched to the state's official license list. Look for the green Licensed badge, or browse by city, like Kansas City, St. Louis and Springfield.

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Last reviewed October 8, 2026. This guide is general information, not legal advice. Laws change, so check the official sources below before you rely on any detail.