Missouri

Overview

Missouri voters approved Amendment 3 in 2022, adding adult-use legalization to the state constitution, and retail sales began in February 2023. Adults 21+ may possess up to three ounces. Adults who get a personal cultivation registration card from the state may grow plants at home within limits. The Division of Cannabis Regulation oversees both the adult-use and medical programs. The amendment also included a process to expunge some past marijuana offenses.

Last reviewed October 2026. General information, not legal advice.

What's Legal

Public consumption is prohibited; consumption is allowed on private property.

Possession Limits

3 oz in public

Home Growing

Up to 6 plants per person, 12 per household

Driving and Cannabis

Driving while impaired by cannabis is illegal in Missouri, as it is in every state, whether or not the cannabis was obtained legally. Officers may rely on field sobriety tests, drug recognition evaluations, and blood tests, and some states set specific THC limits or zero-tolerance rules. Consuming cannabis in a vehicle and carrying open or unsealed packages where the driver can reach them are commonly prohibited. If you have used cannabis, the safest choice is not to drive.

Crossing State Lines and Federal Law

Taking marijuana across state lines is illegal under federal law, even between two states where cannabis is legal, and it may also violate the law of the state you enter. Marijuana is also prohibited on federal land, in national parks, and at airports under TSA jurisdiction. In 2026 the federal government moved FDA-approved products and state-licensed medical marijuana to Schedule III, but adult-use marijuana remains a Schedule I substance, and rescheduling does not legalize interstate transport. Separate federal changes to the legal definition of hemp take effect in late 2026 and will restrict many intoxicating hemp-derived THC products.

Official Resource

Cannabis laws change often, and limits, penalties, and program rules can differ from what is summarized here. This page is general information, not legal advice. Before you rely on any detail, check the official state source below or consult a licensed attorney in Missouri.