In Missouri, an adult 21 or older can buy up to three ounces of cannabis flower per transaction at a licensed dispensary, and a registered medical patient can buy up to six ounces in any rolling 30-day period. Both limits apply to dried flower or its equivalent in other product forms, and both are enforced through the Department of Health and Senior Services (DHSS).
The Recreational Limit: Three Ounces Per Transaction
If you’re 21 or older with a valid photo ID, three ounces of dried flower is the ceiling on a single dispensary purchase.1Missouri Department of Health & Senior Services. Adult Use FAQs – Section: Differences in the Medical Program Versus Adult Use Program That figure is written into the state constitution as a minimum, so regulators cannot set it lower.2Missouri Revisor of Statutes. Missouri Constitution Article XIV Section 2
You don’t have to buy three ounces of flower to hit the cap. Missouri uses Marijuana Equivalency Units (MMEs) to translate between product types. One MME equals 3.5 grams of flower, 1 gram of concentrate, or 100 milligrams of THC in an edible.3Missouri Department of Health & Senior Services. Medical Marijuana in Missouri Three ounces of flower comes out to roughly 24 MMEs. Split that however you want across flower, concentrates, and edibles, as long as the total stays at or below 24.
The Medical Limit: Six Ounces Every 30 Days
A valid Missouri medical marijuana card raises your purchase limit to six ounces of dried cannabis, or its equivalent in other products, over a rolling 30-day window.4Missouri Department of Health & Senior Services. Patient and Consumer FAQs – Section: Patient/Caregiver Purchase and Possession Limit It’s twice the recreational transaction cap, and it resets month to month rather than visit to visit.
Patients whose treatment calls for more can ask their certifying physician or nurse practitioner to authorize a higher amount on the certification form, provided the clinician documents a compelling reason.4Missouri Department of Health & Senior Services. Patient and Consumer FAQs – Section: Patient/Caregiver Purchase and Possession Limit Every purchase gets logged against your allotment when the dispensary scans your card, so you can’t stack purchases across different stores to work around the limit.
Purchase Limits Are Not the Same as Possession Limits
These two numbers get confused constantly, and the difference is worth pinning down before you shop.
For recreational users, the possession limit matches the purchase limit: three ounces of flower or its MME equivalent at any given time, regardless of when you bought it.1Missouri Department of Health & Senior Services. Adult Use FAQs – Section: Differences in the Medical Program Versus Adult Use Program
Medical patients get more room. The standard possession allowance is a 60-day supply, or 12 ounces of dried cannabis. Patients with a cultivation authorization can hold a 90-day supply, but anything above the 60-day amount has to be stored in an enclosed, locked facility at home.1Missouri Department of Health & Senior Services. Adult Use FAQs – Section: Differences in the Medical Program Versus Adult Use Program So a patient can lawfully accumulate more cannabis than they can buy in a single 30-day window, but only by staying inside that possession ceiling.
Where and How You Buy
Cannabis sales in Missouri are legal only through dispensaries licensed by DHSS. Buying from anyone else is illegal, even if the seller claims their product was legally grown.5Missouri Department of Health & Senior Services. General FAQs – Section: Dispensaries/Purchasing DHSS maintains a searchable list of licensed facilities, and each store displays a state-issued verification decal.6Missouri Department of Health & Senior Services. Licensed Facilities
Recreational buyers need government-issued photo ID proving age 21 or older. A Missouri driver’s license, a U.S. passport, or a military ID all work.5Missouri Department of Health & Senior Services. General FAQs – Section: Dispensaries/Purchasing Medical patients present their state-issued patient card, which the dispensary scans to verify status and post the purchase to the 30-day tally.
Out-of-State Visitors
You do not have to be a Missouri resident to buy recreationally. Any adult 21 or older with valid photo ID can purchase at a licensed dispensary. On the medical side, Missouri dispensaries may accept out-of-state patient cards, but acceptance isn’t guaranteed.5Missouri Department of Health & Senior Services. General FAQs – Section: Dispensaries/Purchasing Call ahead and ask what documentation to bring.
What You’ll Actually Pay in Tax
Recreational purchases carry a 6% state excise tax, and local governments can layer on up to 3% more, so the tax added at the register can run as high as 9% depending on the city or county.1Missouri Department of Health & Senior Services. Adult Use FAQs – Section: Differences in the Medical Program Versus Adult Use Program
Medical patients pay a 4% state tax on cannabis purchases.7Missouri Department of Revenue. Marijuana Over time, that gap is a common reason patients keep their medical card active after recreational sales began.
If You Go Over the Limit
Missouri built a graduated penalty structure for adults who exceed the three-ounce personal cap. The consequences climb quickly once you cross into felony territory.
- Three to six ounces, first offense: civil violation, fine up to $250, and forfeiture of the cannabis. No criminal record.
- Three to six ounces, second offense: fine up to $500 and forfeiture.
- Three to six ounces, third or later offense: fine up to $1,000 and forfeiture.8Ecode360. No Public Smoking Or Consumption Of Marijuana
- More than six ounces: felony exposure. Prosecutors often treat that quantity as evidence of intent to distribute, which carries prison time.
Before Amendment 3, Missouri’s older criminal statutes made possession of more than 35 grams (roughly 1.25 ounces) a felony. That threshold no longer applies to adults 21 and over holding three ounces or less, because Amendment 3 constitutionally shields that amount from prosecution.2Missouri Revisor of Statutes. Missouri Constitution Article XIV Section 2 Anyone under 21, or anyone whose situation falls outside Amendment 3’s framework, can still be charged under the older law. Selling cannabis outside the licensed dispensary system carries its own felony exposure.
Federal Law Sets a Different Boundary
Missouri’s rules stop at the state line and at the edge of federal property. Cannabis remains a controlled substance under federal law, so any amount on national park land, military installations, federal courthouses, or post offices is illegal regardless of your state-legal purchase.9National Park Service. Marijuana and Other Substances
Carrying cannabis across state lines is a federal offense even when both states have legalized it. The TSA doesn’t screen specifically for cannabis, but officers are required to notify law enforcement if they find it during a search.10Transportation Security Administration. Medical Marijuana Anything you buy in Missouri should stay in Missouri.