Is recreational cannabis legal in Montana?

The short version

Montana runs two legal cannabis lanes at once. Adults 21 and over buy at licensed adult-use dispensaries with a valid, unexpired photo ID. Registered medical cardholders buy under the older medical program, which carries its own limits and its own tax rate.

Both lanes run through state-licensed businesses. Buying from anyone who does not hold a Montana license stays illegal, no matter what the seller tells you.

How Montana got here

Montana voters approved adult-use cannabis at the ballot in November 2020. Possession for adults became legal on January 1, 2021. Licensed retail sales opened a year later, on January 1, 2022. The medical program predates all of that and continues to operate alongside it.

The Cannabis and Alcohol Regulation Division of the Montana Department of Revenue licenses and inspects the businesses. Every plant is tracked from the grow through the sale, and every product on a licensed shelf carries lab testing behind it.

What "legal" covers

Legal here means a narrow, defined set of activities. State law protects the following for adults 21 and over:

• Possessing up to 1 ounce of usable marijuana, counting no more than 8 grams of concentrate and no more than 800 milligrams of THC in solid edible products.
• Buying from a licensed dispensary.
• Growing up to two mature plants and two seedlings at a private residence, kept in a locked space and out of public view. Registered cardholders may grow twice that.
• Giving up to 1 ounce to another adult 21 or over, with no money changing hands.

What stays illegal

The list of things Montana still prohibits matters more than the list of things it allows, because most people get tripped by this half.

• Consuming in a public place, or on a train, bus, or other public transportation.
• Driving under the influence. Montana sets a per se limit of 5 nanograms per milliliter of delta-9 THC in blood.
• Consuming as a driver or as a passenger inside the enclosed compartment of a vehicle in operation.
• Smoking in a hotel or motel room, unless the room was designated as a smoking room and rented to you.
• Carrying cannabis across a state line. Federal law governs that, and no Montana card or receipt changes it.
• Selling to anyone without a license, including a friend paying you back.

County by county

Montana lets counties decide whether licensed sales happen inside their borders. Counties that voted for the 2020 initiative allow adult-use sales by default. Counties that voted against it stay closed to adult-use sales unless local voters open them.

That is why a dispensary sits in one Montana county and not in the next one over. If you are traveling and planning to buy, check the county before you drive.

Federal law has not moved

Cannabis remains a federally controlled substance. That gap shows up in ordinary ways. Federal land inside Montana, including national parks and national forest, follows federal rules. Federally subsidized housing follows federal rules. Employers may keep drug-free workplace policies, and state legalization does not override an employer's testing policy. Firearms purchase forms ask a federal question about controlled substance use, and cannabis counts.

Buying and carrying, in practice

Bring a valid, unexpired government photo ID. A dispensary that cannot verify your age will not sell to you, and expired IDs get turned away often.

Your purchase leaves the store in its original sealed packaging with a state label on it. Keep it that way while you drive. Montana's transport guidance points you to a locked glove box, a trunk, a truck bed, or another closed container that a driver or passenger does not normally occupy. An open, half-used package on the passenger seat is the thing that draws a citation.

At the counter

Two things settle most of the confusion at the register. First, the possession cap is a single ceiling shared across product types, not a separate allowance for each one. Flower, concentrate, and edibles all count toward the same ounce. Second, the price on the shelf tag is before tax, and Montana's adult-use rate plus the Cascade County local option lands on top of it.

If a rule matters to a decision you are about to make, check it at the source. The Montana Department of Revenue publishes the current limits, the county list, and the program rules, and the Montana Code Annotated carries the statute text itself.