Cannabis Legalization in Massachusetts: Limits, Growing, and Records

Cannabis laws in Massachusetts allow adults 21 and older to possess up to one ounce of marijuana flower in public, store up to ten ounces at home, grow a limited number of plants, and buy from licensed retailers. The framework was created by Question 4, the 2016 ballot initiative, and is codified in Massachusetts General Laws Chapter 94G. The Cannabis Control Commission (CCC) writes the regulations and oversees the licensed industry.¹ Legalization at the state level is real, but it stops at several federal lines that still matter. Here is what applies to you.

How Much You Can Have

The rules split by location. In public, the ceiling is one ounce of flower or five grams of concentrate (oils, waxes, resins). At home, you can keep up to ten ounces, plus whatever your own plants produce on the premises.²

Anything above one ounce at your residence must be stored in a locked space. The rule exists to keep cannabis away from anyone under 21, and it applies whether the product came from a dispensary or your own garden.²

Go over the public limit and the penalties climb quickly. More than one ounce but no more than two ounces outside the home is a civil fine of up to $100 plus forfeiture of the excess. Larger amounts can push the case into criminal territory under Chapter 94C, including possible prosecution for possession with intent to distribute.³

Buying From a Dispensary

Retailers cap what you can buy in a single transaction at the same amounts you can carry in public: one ounce of flower or five grams of concentrate. Recent legislation raised the edible cap to 1,000 milligrams of THC per transaction, up from 500, though the CCC is still finalizing the implementing regulations. Check the current posted limits before you shop.⁴

Budget for tax. Massachusetts charges a 10.75% cannabis excise tax on retail sales, and the 6.25% state sales tax applies too. Your city or town may add up to 3% more, bringing the total to roughly 20%. Bring cash, or confirm before you go that the store offers a cashless ATM or debit workaround. Visa and Mastercard still refuse to process cannabis transactions because marijuana remains a federally controlled substance, which creates compliance risk for banks and card networks.

Gifting Rules

You can give another adult 21 or older up to one ounce of flower or five grams of concentrate. The transfer has to be genuinely free: no cash, no barter, and no tying the “gift” to the purchase of some other product. Bundled schemes (an overpriced sticker that happens to come with an eighth, for example) are treated as unlicensed sales and can be prosecuted criminally.⁵ Public advertising or promotion of the gift is also off-limits.

Growing at Home

Each adult 21 or older can cultivate up to six plants inside a primary residence. A household with two or more adults is capped at 12 plants total, no matter how many adults live there.²

Two conditions apply to every grow. The growing area needs a lock or other security device that keeps anyone under 21 out. And the plants cannot be visible from any public place without binoculars, aircraft, or other optical aids. Break either rule and you face a civil fine of up to $300 plus forfeiture. Growing seven to 12 plants as a single adult carries a civil fine of up to $100 and forfeiture of the excess.³

The visibility rule catches more people than the lock rule. A balcony plant a neighbor can see from the sidewalk is enough. Indoor grows behind curtains or in a locked closet are the safest setup.

Where You Can Consume

Cannabis use in Massachusetts is limited to private property. Using it in a public place, or anywhere a local ordinance already bans tobacco smoking, is a civil violation with a fine of up to $100.³ “Public place” is read broadly and covers parks, sidewalks, restaurants, venues, and transit facilities.

Landlords can prohibit smoking cannabis in a rental unit, but under state law they cannot ban other forms of consumption such as edibles or tinctures.¹ Hotels and similar businesses can ban cannabis use entirely on their property. If your lease bans smoking, non-combustible products keep you within the rules.

Social Consumption Venues

The CCC’s regulations for social consumption establishments took effect in January 2026. These licensed venues can allow on-site use in a controlled setting, but each city or town must first opt in by referendum, ordinance, or bylaw.⁶ Whether one exists near you depends entirely on local action.

Federal Land

National parks, military installations, federal courthouses, and other federal property inside the state are governed by federal drug law, where marijuana remains a controlled substance. A first federal possession offense is a misdemeanor carrying up to one year in jail and a $1,000 fine. A second offense raises the maximum to two years and $2,500, with a 15-day mandatory minimum. State legalization has no effect on any of it.

Transporting Cannabis in a Vehicle

You can move cannabis by car, but open-container rules apply. Having an opened package (seal broken, or contents partially removed or consumed) in the passenger area of a motor vehicle is prohibited.³

Store opened cannabis in the trunk or a locked glove compartment. In a vehicle without a trunk, use the area behind the last upright seat where it’s not readily accessible. A violation is a civil fine of up to $500, and no sign of impairment is required for the citation.⁷ Sealed retail packaging in the passenger cabin is fine.

Driving Under the Influence

Operating a vehicle while impaired by marijuana is prosecuted under the same OUI statute as drunk driving (G.L. c. 90, § 24). Unlike alcohol, there is no per se THC blood-level threshold, so cases turn on officer observations, field sobriety tests, and drug recognition expert assessments.

The penalty tiers:

First offense: up to 2.5 years in a house of correction, a fine of $500 to $5,000, and a one-year license suspension. A hardship license may be available after three months.
Second offense: a 30-day mandatory minimum, a fine of $600 to $10,000, a two-year suspension, and a required ignition interlock device.
Third offense: a 150-day mandatory minimum, a fine of $1,000 to $15,000, an eight-year suspension, and felony classification.

Between legal fees, insurance surcharges, reinstatement costs, and the interlock, a first OUI conviction routinely runs $10,000 or more in total. Treat cannabis behind the wheel the way you treat alcohol.

Federal Conflicts That Still Apply

Firearms

Federal law bars anyone who is “an unlawful user of or addicted to any controlled substance” from possessing firearms or ammunition.⁸ Because marijuana is still federally controlled, any cannabis user is technically prohibited from buying or owning a gun under 18 U.S.C. § 922(g)(3), even in a legal state. ATF Form 4473 at the point of purchase asks directly whether you are an unlawful user of a controlled substance; answering “no” while using cannabis is a federal felony.

The U.S. Supreme Court heard oral arguments in United States v. Hemani in March 2026, a case challenging whether the Second Amendment permits the ban on firearms for marijuana users. No decision has issued. Until one does, the federal prohibition remains enforceable.

Air Travel

Airports and aircraft are federal jurisdictions. TSA does not actively hunt for marijuana, but officers who find it during a security screening are required to refer the matter to law enforcement.⁹ What happens next depends on the airport’s local jurisdiction: at a Massachusetts airport, local police may just have you discard it; at an airport in a state where cannabis is illegal, arrest is possible. International travel with cannabis is a serious crime regardless of where you leave from or where you land.

Your Job Is Not Protected

Massachusetts has not passed a statute shielding employees from discipline or termination based on off-duty recreational marijuana use. The legalization law states plainly that it does not require employers to permit or accommodate cannabis in the workplace and does not limit employer authority over workplace drug policies.¹

An employer can maintain a zero-tolerance policy, test you before hiring or at random during employment, and fire you for a positive THC result, even if the use happened at home on a weekend. Federally regulated positions such as commercial drivers, defense contractors, and anyone holding a security clearance face stricter rules still. If your job involves drug testing, legalization does not protect you.

Clearing an Old Cannabis Record

People with certain prior marijuana convictions can petition for expungement under G.L. c. 276, § 100K ¼. Eligible offenses include possession of amounts now decriminalized (two ounces or less outside the home, or ten ounces or less at home), along with distribution charges that arose from the same incident as a decriminalized possession amount.

File the petition in the court that handled the original case and serve a copy on the district attorney’s office. The statute gives the court 30 days to expunge the record after a petition is filed. Expungement destroys the record, unlike sealing, which only restricts access.

Governor Healey issued a blanket pardon in 2024 covering all Massachusetts convictions for simple possession of marijuana that occurred before March 13, 2024. If your conviction falls under that pardon, request a pardon certificate before filing an expungement petition so the court can locate and process your records more easily.

1
General Court of Massachusetts. Massachusetts General Laws Chapter 94G – Regulation of the Use and Distribution of Marijuana Not Medically Prescribed
2
General Court of Massachusetts. Massachusetts General Laws Chapter 94G Section 7 – Personal Use of Marijuana
3
General Court of Massachusetts. Massachusetts General Laws Chapter 94G Section 13 – Penalties
4
Cannabis Control Commission Massachusetts. Know the Laws
5
Cannabis Control Commission. Guidance on Distribution of Marijuana
6
Cannabis Control Commission Massachusetts. Massachusetts Social Consumption Establishment Regulations Are Now in Effect
7
Mass.gov. Massachusetts Code c.94G Section 13 – Penalties
8
Office of the Law Revision Counsel. 18 U.S. Code Section 922 – Unlawful Acts
9
Transportation Security Administration. Medical Marijuana