Marijuana is legal in Montana for adults 21 and older, including possession, purchases from licensed dispensaries, noncommercial sharing and limited home cultivation. Montana also operates a separate medical marijuana program that provides registered patients with higher purchase and home-growing limits and a substantially lower tax rate.
Adults may possess up to 1 ounce of usable marijuana, including no more than 8 grams of concentrate and no more than 800 milligrams of THC in edible marijuana products. Adults may also grow up to two mature marijuana plants and two seedlings at a private residence.
Montana voters approved recreational marijuana legalization through Initiative 190 in November 2020. Licensed adult-use sales began January 1, 2022.
This page covers Montana marijuana possession limits, legal sales, home cultivation, medical marijuana, taxes, delivery, public consumption and penalties. For laws in other states, visit The Marijuana Herald’s Marijuana Laws by State guide.
Last updated: September 13, 2026
Montana Marijuana Laws at a Glance
| Law | Current Rule |
|---|---|
| Recreational marijuana | Legal for adults 21 and older |
| Adult possession limit | 1 ounce of usable marijuana |
| Concentrate limit | 8 grams or 8 milliliters |
| THC in edible products | Up to 800 mg total possession |
| Recreational sales | Legal in counties allowing adult-use sales |
| Recreational home grow | 2 mature plants and 2 seedlings per adult, subject to household cap |
| Maximum recreational plants at one residence | 4 mature plants and 4 seedlings |
| Medical marijuana | Legal |
| Medical purchase limit | 1 ounce per day and 5 ounces per rolling 30 days |
| Medical home grow | 4 mature plants and 4 seedlings per registered cardholder |
| Public smoking | Illegal outside specifically licensed areas |
| Adult-use delivery | Prohibited |
| Medical delivery | Allowed to registered cardholders |
| Adult-use state tax | 20% |
| Medical marijuana state tax | 4% |
| Local marijuana tax | Up to an additional 3% |
Is Recreational Marijuana Legal in Montana?
Yes. Recreational marijuana is legal in Montana for adults 21 and older.
Adults may possess, purchase, use and transport marijuana within the state’s legal limits. They may also give marijuana to another adult without payment and cultivate a limited number of marijuana plants at home.
Montana’s recreational marijuana system is regulated by the Montana Department of Revenue’s Cannabis and Alcohol Regulation Division.
Legal adult-use retail sales began January 1, 2022.
How Much Marijuana Can You Possess in Montana?
An adult 21 or older may possess up to 1 ounce of usable marijuana.
Within that limit, Montana allows no more than:
- 8 grams or 8 milliliters of marijuana concentrate
- 800 milligrams of THC in edible marijuana products intended to be eaten or swallowed
These product amounts are treated as equivalents to 1 ounce of marijuana flower rather than completely separate possession allowances.
Adults who legally grow marijuana at home may possess marijuana produced by those plants in excess of 1 ounce, but the excess marijuana must remain secured at the private residence.
How Much Marijuana Can You Buy in Montana?
An adult 21 or older may purchase up to the state’s personal possession limit.
That generally means up to:
- 1 ounce of marijuana flower
- 8 grams or 8 milliliters of concentrate
- 800 milligrams of THC in qualifying marijuana products
Dispensaries cannot knowingly complete a transaction that would cause a customer to exceed Montana’s personal possession limits.
Adult-use marijuana flower sold by a licensed dispensary may contain no more than 35% total potential psychoactive THC.
As of July 1, 2026, a single serving of an adult-use edible marijuana product may contain no more than 5 milligrams of THC. A package of edible or food products may contain up to 100 milligrams of THC.
The 5-milligram serving limit replaced Montana’s previous 10-milligram limit.
Can Tourists Buy Marijuana in Montana?
Yes.
Adults 21 and older visiting Montana may purchase recreational marijuana from licensed adult-use dispensaries.
A customer does not need to be a Montana resident to make an adult-use purchase, but must present valid identification showing they are at least 21.
Visitors are subject to the same 1-ounce possession limit that applies to Montana residents.
Marijuana purchased in Montana cannot legally be transported across state lines, even when traveling to another state where marijuana is legal.
Can You Grow Marijuana at Home in Montana?
Yes.
An adult 21 or older may cultivate:
- 2 mature marijuana plants
- 2 seedlings
The plants must be grown at a private residence.
If multiple adults live at the same residence, no more than twice the individual allowance may be cultivated at the property at the same time. This produces a household maximum of:
- 4 mature plants
- 4 seedlings
Marijuana plants and marijuana produced by the plants in excess of 1 ounce must be kept in a locked space at the residence.
The plants and stored marijuana cannot be visible by normal, unaided vision from a public place.
A person must own the residence or obtain written permission from the property owner before cultivating marijuana there.
What Are the Penalties for Breaking Montana’s Home-Grow Rules?
Montana imposes civil penalties for certain home cultivation violations.
Cultivating marijuana where the plants are visible from a public place can result in:
- A civil fine of up to $250
- Forfeiture of the marijuana
Cultivating plants or storing marijuana outside a locked space can also result in a civil fine of up to $250 and forfeiture.
More serious cultivation outside Montana’s personal-use protections can result in criminal charges.
Is Medical Marijuana Legal in Montana?
Yes.
Montana has a medical marijuana program for residents with qualifying debilitating medical conditions.
A patient must receive a recommendation from a Montana-licensed physician and register with the Department of Revenue.
Registered cardholders may purchase medical marijuana at licensed dispensaries throughout Montana.
Medical patients receive several advantages over recreational consumers, including higher purchasing limits, more home-grown plants, access to higher-potency products and a much lower state marijuana tax.
What Conditions Qualify for Medical Marijuana in Montana?
Montana’s qualifying debilitating medical conditions include:
- Cancer when the disease or its symptoms seriously and adversely affect the patient’s health
- Glaucoma when the condition seriously and adversely affects the patient’s health
- HIV or AIDS when the condition seriously and adversely affects the patient’s health
- Cachexia or wasting syndrome
- Severe chronic pain
- Intractable nausea or vomiting
- Epilepsy
- Intractable seizure disorders
- Multiple sclerosis
- Crohn’s disease
- Painful peripheral neuropathy
- Central nervous system disorders resulting in chronic painful spasticity or muscle spasms
- Admission into hospice care
- Post-traumatic stress disorder
The patient’s physician must certify that the patient has a qualifying debilitating condition and that marijuana is medically appropriate under Montana’s requirements.
How Much Medical Marijuana Can Patients Buy in Montana?
Registered medical marijuana cardholders may purchase:
- Up to 1 ounce of usable marijuana per day
- Up to 5 ounces during a rolling 30-day period
For purposes of calculating purchases, 1 ounce of marijuana flower is generally equivalent to:
- 800 milligrams of THC in marijuana-infused products
- 8 grams or 8 milliliters of marijuana concentrate
A patient whose medical needs require a larger amount may petition the Department of Revenue for an exception.
With physician support and department approval, the monthly purchasing allowance may be increased to as much as 8 ounces.
How Much Medical Marijuana Can a Patient Possess?
A registered cardholder using Montana’s licensed dispensary system may generally possess up to 1 ounce of usable marijuana at a time.
The medical program’s higher 5-ounce allowance is a purchase limit over a rolling 30-day period rather than permission to carry 5 ounces at once.
Different protections apply to registered cardholders who legally cultivate marijuana at their residence.
Can Medical Marijuana Patients Grow Marijuana at Home?
Yes.
A registered medical marijuana cardholder may cultivate:
- 4 mature marijuana plants
- 4 seedlings
That is twice the individual recreational cultivation allowance.
If multiple registered cardholders share a residence, Montana allows no more than twice the medical individual plant allowance at that residence, for a maximum of:
- 8 mature marijuana plants
- 8 seedlings
Plants and excess marijuana must be secured and cannot be visible from a public place.
The patient must own the residence or have written permission from the property owner.
What Are the Benefits of a Montana Medical Marijuana Card?
Montana’s medical program provides several concrete benefits despite recreational legalization.
Registered patients receive:
- A 5-ounce rolling 30-day purchase allowance instead of the ordinary 1-ounce adult-use limit
- The ability to petition for a monthly allowance of up to 8 ounces
- Four mature home-grown plants and four seedlings instead of two of each
- Access to marijuana products that may exceed the potency limits imposed on adult-use products
- Medical marijuana delivery from authorized businesses
- A state marijuana tax rate of 4% instead of 20%
- Medical marijuana access for qualifying patients younger than 21 under additional requirements
For patients who regularly purchase marijuana, the tax difference alone can make maintaining medical registration financially significant.
Does Montana Accept Out-of-State Medical Marijuana Cards?
No. Montana’s medical marijuana registry is limited to Montana residents.
Applicants must provide proof of Montana residency and obtain a physician recommendation from a physician licensed in Montana.
An out-of-state medical marijuana card therefore does not allow a visitor to purchase marijuana at Montana’s medical tax rate or use the state’s higher medical limits.
Visitors who are at least 21 may still purchase marijuana as recreational consumers from adult-use dispensaries where those sales are allowed.
Can You Give Marijuana to Another Adult in Montana?
Yes.
An adult 21 or older may give another adult 21 or older up to Montana’s legal personal possession amount without receiving payment.
That means a noncommercial transfer may include up to:
- 1 ounce of marijuana
- Up to 8 grams of concentrate within the equivalent limit
- Up to 800 milligrams of THC in qualifying edible products
The transaction must involve no compensation.
Selling marijuana without the appropriate state license remains illegal.
Where Can You Use Marijuana in Montana?
Marijuana generally may be consumed on private property where its use is allowed.
Smoking marijuana in a public place is prohibited unless the location has been specifically licensed for marijuana consumption.
A person who smokes marijuana in an unauthorized public place may face a civil fine of up to $50.
Montana’s Clean Indoor Air Act also prohibits smoking marijuana and vaping in enclosed public places and workplaces.
Property owners may impose additional restrictions on marijuana consumption.
Can You Use Marijuana in a Car in Montana?
Drivers cannot consume marijuana or drive while impaired.
Montana law prohibits driving while under the influence of marijuana. State law also establishes a THC standard of 5 nanograms per milliliter of blood or another bodily substance for driving purposes.
Montana separately regulates how marijuana may be kept in a vehicle on a public highway.
A violation of the state’s motor-vehicle marijuana possession requirements is a civil violation carrying a fine of up to $100.
The violation is not a criminal offense and is not recorded against the person’s driving record.
Can You Bring Marijuana Into or Out of Montana?
No.
Marijuana cannot legally be transported across Montana’s state borders.
This applies to both recreational marijuana and medical marijuana.
A Montana medical marijuana card does not create an exception to the prohibition on interstate transportation.
Visitors should purchase marijuana within Montana rather than bringing products into the state.
Is Marijuana Delivery Legal in Montana?
Delivery rules differ for recreational and medical marijuana.
Adult-use marijuana delivery directly to recreational consumers is prohibited.
Licensed businesses may deliver marijuana to registered medical marijuana cardholders.
Montana’s Department of Revenue specifically states that dispensaries may deliver to registered cardholders but that adult-use delivery is prohibited.
Can Local Governments Ban Recreational Marijuana Stores?
Yes.
Montana uses what are commonly described as “green” and “red” counties.
Counties where a majority of voters supported Initiative 190 in 2020 generally allow adult-use marijuana sales and are commonly called green counties.
Counties where voters rejected Initiative 190 generally prohibit adult-use sales unless local voters subsequently authorize them. These are often called red counties.
Medical marijuana sales may still occur through qualifying licensed businesses in jurisdictions where adult-use retail sales are prohibited.
Local governments also retain authority to adopt reasonable zoning and time, place and manner restrictions on marijuana businesses.
As a result, recreational marijuana possession may be legal statewide even though adult-use dispensaries are unavailable in some parts of Montana.
How Is Recreational Marijuana Taxed in Montana?
Montana imposes a 20% state tax on adult-use marijuana retail sales.
Counties may impose an additional local-option marijuana excise tax of up to 3%.
The maximum marijuana-specific tax rate can therefore reach 23% in counties imposing the full local tax.
Montana’s marijuana taxes are imposed at the retail level.
Personally cultivated marijuana is not subject to the state’s retail marijuana tax.
How Is Medical Marijuana Taxed in Montana?
Medical marijuana is taxed at a substantially lower rate.
Montana imposes a 4% state tax on medical marijuana retail sales.
Counties may add a local marijuana tax of up to 3% on medical marijuana if voters have approved it.
That means registered patients can save 16 percentage points on the state marijuana-specific tax compared with recreational consumers.
What Are the Penalties for Possessing Too Much Marijuana in Montana?
Adults 21 and older may legally possess up to 1 ounce of usable marijuana.
Possession above that limit but below 2 ounces receives reduced civil penalties rather than ordinary criminal punishment.
| Amount/Circumstance | Penalty |
|---|---|
| Up to 1 ounce | Legal for adults 21+ |
| More than 1 ounce but less than 2 ounces, first violation | Up to $200 civil fine or up to 4 hours community service |
| More than 1 ounce but less than 2 ounces, second violation | Up to $300 civil fine or up to 6 hours community service |
| More than 1 ounce but less than 2 ounces, third or subsequent violation | Up to $500 civil fine or up to 8 hours community service |
The same civil structure applies when the amount of marijuana concentrate exceeds 8 grams but remains below 16 grams.
Marijuana involved in these violations is subject to forfeiture.
Possession of larger quantities falls outside this civil penalty provision and can result in criminal prosecution under Montana’s controlled-substance laws.
What Are the Marijuana Rules for People Under 21?
Recreational marijuana is restricted to people 21 and older.
People younger than 21 who are not registered medical marijuana patients face separate penalties for possessing, using or sharing marijuana.
Registered medical patients younger than 21 may legally access marijuana when they satisfy Montana’s medical program requirements.
Minor medical applicants face additional safeguards. A second physician generally must approve the application unless the primary treating or referral physician is an oncologist, neurologist or epileptologist.
What Changed With Montana Marijuana Laws in 2026?
Montana made several regulatory changes affecting marijuana products and dispensaries in 2026, although the basic adult possession and home cultivation limits remained unchanged.
Edible THC Serving Limit Reduced
Effective July 1, 2026, Montana reduced the maximum amount of THC in a single serving of an adult-use edible or food product from 10 milligrams to 5 milligrams.
A package may still contain up to 100 milligrams of THC.
Medical marijuana dispensaries may sell qualifying registered cardholders products with higher potency levels than the ordinary adult-use limits.
New Marijuana Packaging and Warning Requirements
Also beginning July 1, dispensaries became subject to new requirements for exit packaging and consumer education.
The changes require updated warning statements and an addiction-resource QR code on exit packaging, along with consumer education materials at points of sale.
Related Department of Revenue packaging and labeling rules took effect August 22, 2026.
New Business Disclosure Rules Proposed
The Department of Revenue also proposed additional rules in August 2026 governing marijuana businesses’ relationships with third parties providing services such as management, consulting, financing, staffing and revenue distribution.
The proposed rules would require detailed disclosure before a third party begins work.
As of September 13, the proposal had gone through its public hearing and comment period but should not yet be treated as a final adopted rule.
Related Marijuana Laws and Protections
Residents should also be aware that legalization does not eliminate restrictions on impaired driving or guarantee workplace protections. See our guides to marijuana DUI laws by state and marijuana employment laws for a broader look at how Illinois compares with other states.
People with past marijuana convictions may also qualify for record-clearing relief. Our Marijuana Expungement Laws by State guide explains how all 50 states handle expungement and related relief.
Official Sources
- Montana Code § 16-12-106, Personal Use and Cultivation of Marijuana: Montana Leislature
- Montana Code § 16-12-224, Dispensaries and Product Limits: Montana Legislature
- Montana Medical Marijuana Cardholder Information: Montana Department of Revenue
- Montana Home Cultivation Rules: Montana Department of Revenue
- Montana Cannabis Tax Information: Montana Department of Revenue
- Montana Cannabis FAQs and County Sales Rules: Montana Department of Revenue
