Massachusetts Weed Laws: What Is Legal

Adults 21 and older can buy, carry and use cannabis in Massachusetts within set limits. Using it in public, driving after using it, and taking it out of the state are still illegal. Each rule below links to the sentence it comes from. The limit doubled in 2026, so check the date on anything older.

The rules at a glance

You must be 21 years or older to purchase or grow adult-use marijuana(CCC Know the Laws).

If you are over 21 years old, you may possess up to two ounces of marijuana on your person, and not more than ten grams of it may be concentrate(CCC FAQs).

In your home, you may possess up to 10 ounces of marijuana, and any amount over two ounces kept in your residence must be secured by a lock(CCC FAQs).

It is illegal to consume marijuana in public(CCC Know the Laws).

It is illegal to drive while under the influence of cannabis(CCC Know the Laws).

Massachusetts law allows you to grow up to six cannabis plants in your home, or up to 12 plants for two or more adults(CCC Know the Laws).

It is illegal to drive across state lines with cannabis, or to transport it on a plane, train, boat, or other mode of transportation outside of Massachusetts(CCC Know the Laws).

The Commission says you cannot send marijuana by mail, even to states and countries where marijuana use is legal(CCC Know the Laws).

What changed in 2026

Chapter 65 of the Acts of 2026 is titled An Act Modernizing the Commonwealth's Cannabis Laws(session law).

It changed the adult-use statute to 2 ounces or less of marijuana, or the equivalent amount of marijuana products as determined by the Commission(session law).

Daily purchase limits increased immediately on April 19 from 1 to 2 ounces of cannabis(CCC release).

A guide that says one ounce was written before the change.

Adults, patients and visitors

Qualifying patients over 18 years of age must be approved by a physician and certified by the state before they can possess up to a 60-day supply of marijuana(CCC Know the Laws).

The medical card guide has the steps.

Visitors from another state must be 21 years or older and present a valid government-issued ID to purchase cannabis in Massachusetts(CCC Know the Laws).

The visitors page has the rest.

Landlords, hotels and employers

Under the statute a lease must not stop a tenant from consuming marijuana by means other than smoking where the tenant resides, unless failing to do so would cause the landlord to violate a federal law or regulation(state law).

Employers, landlords, cities, and towns may have their own policies governing the use of marijuana, per the Commission(CCC Know the Laws).

Before consuming, inquire about marijuana use policies if you are staying at a hotel or other type of rental accommodation(CCC Know the Laws).

If your situation turns on a lease or a workplace rule, ask a lawyer.

Gifting

The statute allows giving away or otherwise transferring without remuneration up to 2 ounces of marijuana or the equivalent amount of marijuana products as determined by the commission to a person 21 years of age or older; provided, however, that such transfer shall not be advertised or otherwise promoted to the public(session law).

The Commission's Know the Laws page and FAQs do not address gifting, schools, airports or ferries. That silence is about those two pages, not about the law. If your situation turns on one of these, ask a lawyer.

The details are on the limits page and the public use and driving page.

Short answers

Is weed legal in Massachusetts?

Yes for adults 21 and older, within the limits on this page. You must be 21 years or older to purchase or grow adult-use marijuana(CCC Know the Laws).

How much weed can I carry in Massachusetts?

If you are over 21 years old, you may possess up to two ounces of marijuana on your person, and not more than ten grams of it may be concentrate. In your home, you may possess up to 10 ounces(CCC FAQs).

Can I grow weed at home in Massachusetts?

An adult can grow up to six plants in their home, and the most that may be grown in a residence is 12 plants. The plants must be in an area with a lock or security device(CCC FAQs).