Under Massachusetts marijuana laws, adults 21 and older can possess up to two ounces of cannabis flower in public, keep up to 10 ounces at home, grow six plants per adult, and buy from licensed dispensaries. The framework began with voter approval of Question 4 in 2016 and was updated by the Act Modernizing the Commonwealth’s Cannabis Laws, signed in 2026.1Cannabis Control Commission Massachusetts. An Act Modernizing the Commonwealth’s Cannabis Laws – April 17, 2026 Cannabis is still illegal under federal law, and that conflict matters for gun owners, some employees, and anyone leaving the state.
How Much You Can Have
You must be at least 21 to possess, use, or buy marijuana in Massachusetts.2General Court of Massachusetts. Massachusetts Code Chapter 94G – Section 7 In public, the ceiling is two ounces of flower, 10 grams of THC in concentrate, or 1,000 milligrams of THC in edibles. The 2026 modernization law doubled the old one-ounce public limit.1Cannabis Control Commission Massachusetts. An Act Modernizing the Commonwealth’s Cannabis Laws – April 17, 2026
At home, you can store up to 10 ounces plus whatever your plants produce.2General Court of Massachusetts. Massachusetts Code Chapter 94G – Section 7 Anything over one ounce inside the home has to be locked up. If it isn’t, you face a civil fine of up to $100 and forfeiture of the excess.3Cannabis Control Commission Massachusetts. Frequently Asked Questions
Buying at a Dispensary
Retail sales happen only at stores licensed by the Cannabis Control Commission. Bring a government-issued photo ID showing you’re 21 or older. Temporary IDs don’t work.4Cannabis Control Commission Massachusetts. Visiting a Medical Marijuana Treatment Center Per-transaction limits track the public possession limits: two ounces of flower, 10 grams of concentrate THC, or 1,000 milligrams of edible THC.1Cannabis Control Commission Massachusetts. An Act Modernizing the Commonwealth’s Cannabis Laws – April 17, 2026
Taxes add up fast. Every adult-use purchase carries a 6.25% state sales tax and a 10.75% state excise tax, and cities and towns can add a local option tax of up to 3%. The combined rate reaches 20% in some places.5Cannabis Control Commission Massachusetts. Taxes and Fees Medical marijuana sales are exempt from all three.
Growing at Home
Each adult 21 or older may grow six plants at their primary residence. A household with two or more adults over 21 caps at 12 plants total, no matter how many adults live there.2General Court of Massachusetts. Massachusetts Code Chapter 94G – Section 7
Two security rules apply. Plants must be in a locked or secured area, and they cannot be visible from a public place without binoculars or other optical aids.6Cannabis Control Commission Massachusetts. Home Cultivation An indoor grow room or a fenced outdoor area usually covers both. Break either rule and you face a civil fine of up to $300 plus forfeiture of the plants.7General Court of Massachusetts. Massachusetts Code Chapter 94G – Section 13, Penalties
Where You Can Use It
Using marijuana in any public place, or anywhere tobacco smoking is banned, is illegal. Sidewalks, parks, restaurants, and public buildings are all off limits, with a fine of up to $100 per violation.7General Court of Massachusetts. Massachusetts Code Chapter 94G – Section 13, Penalties
Private homes are the main legal consumption space, but your landlord can prohibit smoking cannabis in your lease. The Cannabis Control Commission has confirmed that landlords can lawfully ban smoking, display, and production of marijuana on property they own.8Cannabis Control Commission. Guidance on Consumption of Marijuana for Adult Use A no-smoking lease clause overrides the fact that cannabis is legal statewide.
Licensed social consumption venues are on the way. The Commission approved draft regulations for three types: supplemental licenses for existing marijuana businesses to allow on-site use, hospitality licenses for non-cannabis businesses to host consumption with a licensed operator, and event organizer licenses for temporary events.9Cannabis Control Commission Massachusetts. Cannabis Control Commission Approves Draft Social Consumption Regulations Only cities and towns that vote to opt in will host them, and alcohol will not be allowed in the consumption areas.
Cannabis in Your Car
Open cannabis containers in a vehicle are treated like open alcohol containers. Marijuana with a broken seal or partly used contents anywhere in the passenger area draws a fine of up to $500.7General Court of Massachusetts. Massachusetts Code Chapter 94G – Section 13, Penalties To transport it legally, keep it sealed in the trunk, a locked glove compartment, or behind the last upright seat where passengers can’t easily reach it.10Cannabis Control Commission Massachusetts. Know the Laws
Driving Impaired
Driving while impaired by marijuana is prosecuted like drunk driving. A first offense carries a fine between $500 and $5,000, up to two and a half years in a house of correction, or both, plus a license suspension of 45 to 90 days.11General Court of Massachusetts. Massachusetts Code Chapter 90 – Section 24, Driving While Under Influence of Intoxicating Liquor There is no per se legal THC limit in blood, so officers use field sobriety tests and drug recognition evaluations. Those cases are harder to prove than alcohol OUIs, but convictions still carry serious consequences.
Gifting to Other Adults
Adults 21 and older may give marijuana to other adults 21 and older without payment or compensation.12Cannabis Control Commission Massachusetts. Guidance on Distribution of Marijuana A gift can’t be advertised or promoted to the public, and dressing up a sale as a gift, such as bundling free marijuana with the purchase of another item, is a criminal offense.
Underage Penalties and Furnishing to a Minor
Anyone under 21 who buys, tries to buy, or arranges to get marijuana faces a civil fine of up to $100 and must complete a drug awareness program. Cultivating up to 12 plants while under 21 carries the same penalty.7General Court of Massachusetts. Massachusetts Code Chapter 94G – Section 13, Penalties Offenders under 18 trigger parental notification. If a minor under 17 doesn’t finish the drug awareness program within a year, delinquency proceedings can follow.
Adults who supply cannabis to someone under 21 face much steeper penalties: a fine of up to $2,000, up to a year in jail, or both.7General Court of Massachusetts. Massachusetts Code Chapter 94G – Section 13, Penalties Narrow exceptions cover providing medical marijuana to a qualifying patient and providing to the children and grandchildren of the person charged.
Where Federal Law Still Applies
Massachusetts can legalize cannabis inside its borders, but marijuana is still a Schedule I controlled substance under federal law. Several situations bring that federal status into your life.
Guns
Federal law bars any “unlawful user of or addicted to any controlled substance” from possessing a firearm or ammunition.13Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts Because cannabis remains illegal federally, every Massachusetts marijuana user is technically prohibited. ATF Form 4473, the questionnaire you fill out when buying a firearm, asks directly whether you are an unlawful user of marijuana. Saying yes disqualifies the purchase. Saying no while using cannabis exposes you to federal charges.
Jobs and Drug Testing
Federal contractors have to maintain drug-free workplaces under 41 U.S.C. ยง 8102, prohibiting possession or use of controlled substances on the job and imposing notification and sanction requirements when employees are convicted of drug offenses.14Office of the Law Revision Counsel. 41 USC 8102 – Drug-Free Workplace Requirements for Federal Contractors Safety-sensitive transportation workers, including commercial drivers, pilots, and transit operators, face mandatory Department of Transportation drug testing that screens for marijuana with zero tolerance.
For state-regulated private employers, the picture is different. Massachusetts courts have held that employees who use medical marijuana off-site and off-duty to treat a disability may be protected under the state’s disability discrimination law. Employers with six or more workers must consider a reasonable accommodation for off-duty medical use before taking adverse action.15Mass.gov. Massachusetts Law About Medical Marijuana Recreational users get no comparable protection, and employers generally keep the right to enforce drug-free policies and discipline positive tests.
Federal Property
National parks, federal courthouses, post offices, and military installations follow federal law. Your state protections end at the property line. Possession there is a federal offense regardless of amount.
Crossing State Lines
Taking marijuana across state lines is a federal crime, even between two states where cannabis is fully legal. TSA officers are not specifically searching for marijuana, but if they find it during screening they are required to refer it to law enforcement, and what happens next depends on the responding officers.16TravelPulse. Flying With Weed – TSA Marijuana Rules Explained TSA applies this policy identically at every airport regardless of state law. Hemp-derived products with 0.3% THC or less are the only exception.