Quick answer: Maine cannabis possession limits let an adult 21 or older carry up to 2.5 ounces of cannabis, and no more than 10 grams of that total can be concentrate. A licensed store can sell you that same amount per transaction. Edibles and THC drinks are capped at 10 mg of THC per serving and 200 mg per package. The concentrate and package caps rose in October 2023.
That date matters. Plenty of pages still quote the old 5-gram concentrate limit and three-plant home grow cap. Both are out of date. Everything below comes from the current text of Title 28-B and the Maine Office of Cannabis Policy (OCP).
What are Maine's cannabis limits at a glance?
| Rule | What Maine law says | Source |
|---|---|---|
| Who | Adults 21+, for personal adult use | 28-B M.R.S. §1502 |
| How many | 6 mature, 12 immature, unlimited seedlings per person | §1502(1) |
| Where | Land you live on, land you own, or someone else's land with written permission | §1502(1)(A) to (C) |
| Multiple sites | Allowed, within your total plant count | §1502(1) |
| Out of sight | Not visible from a public way without aircraft or optical aids | §1502(2)(A) |
| Security | Reasonable precautions against access by anyone under 21 | §1502(2)(B) |
| Plant tags | Name, license or ID number, personal adult use notation, landowner's name if not your land | §1502(2)(C) |
| Local rules | Towns can cap plants per parcel but can't ban, zone out or charge a fee | §1502(3) |
| Your harvest | Keep all of it at home or where it was grown | §1501(1)(E) |
| Extraction | No butane, propane or other flammable solvents | §1503 |
Concentrate isn't extra room on top of the 2.5 ounces. It's a smaller bucket inside the big one.
How much flower can you legally carry in Maine?
You can carry up to 2.5 ounces of flower at any one time if you're 21 or older. That's roughly 70.9 grams, whether it's in your bag or your coat pocket on Commercial Street.
"At any one time" does real work there. The law caps what you have on you, not what you bought this week.
How much can you buy at a Maine dispensary in one visit?
A licensed cannabis store can sell you up to 2.5 ounces, with no more than 10 grams of concentrate, in any single sales transaction. That's 28-B §504, echoed in OCP rule 18-691 CMR Chapter 30.
There's no separate "daily" cap in the statute. The possession ceiling does that job, because once you walk out the door, two purchases still can't add up to more than 2.5 ounces on you.
One small exception: nonedible products with no THC in them, like a CBD-only lotion, don't count toward the transaction limit.
What does 2.5 ounces actually look like?
More than most people picture.
In eighths
An eighth is 3.5 grams. Twenty eighths make 70 grams, just under the line. Twenty-one would put you over.
In pre-rolls
The limit works out to 70 one-gram pre-rolls, or 141 half-grams. Infused pre-rolls are a gray area: Maine's rules don't spell out how the concentrate inside counts toward the 10-gram sub-limit, so if you're buying a lot of them, ask us at checkout. Our guide to the different kinds of cannabis concentrates explains what's usually inside those.
A mixed basket
This basket stays legal:
| Item | Amount | Counts as |
|---|---|---|
| 1 g vape cartridges | 4 carts | 4 g concentrate |
| Live rosin | 2 jars of 1 g | 2 g concentrate |
| Eighths of flower | 12 | 42 g flower |
| 1 g pre-rolls | 10 | 10 g flower |
| Total | 58 g, with 6 g of it concentrate |
Add six more one-gram carts and you'd break the concentrate cap while still under 2.5 ounces total. It's the easiest way to go over, and it's usually vapes.
How do edibles and THC drinks count toward the limit?
Edibles and drinks are limited by THC per serving and per package, and the concentrate inside them counts toward your 10 grams by the weight of the concentrate alone, not the weight of the brownie. That second part comes from the definition of cannabis concentrate in 28-B §102-A, which says the other ingredients aren't included when you weigh the concentrate in a product.
A 12-ounce can of THC seltzer doesn't count as 12 ounces of anything.
The per-package math
- One serving can hold no more than 10 mg of THC.
- One package can hold no more than 200 mg, so a maxed-out package is 20 servings.
- Before October 25, 2023, the package cap was 100 mg, so older guides quoting that number are out of date.
THC drinks are edible cannabis products under Maine law (the definition covers "any type of food, drink or pill"), so the same caps apply. Pair this with how long THC drinks take to kick in, because label math and timing in your body are different problems.
What we can't give you
Maine doesn't publish an official "one package equals X grams" chart, and we won't invent one. As rough arithmetic only, a 200 mg package made with distillate holds well under half a gram of concentrate, so edibles rarely hit the cap alone. Stacked with vapes and dabs, they can. We check every basket before you pay.
Hemp-derived THC drinks sold at gas stations sit outside Title 28-B entirely. Our comparison of hemp THC drinks and dispensary THC drinks explains why.
How is home-grown cannabis treated?
If you grow at home, you can keep all the cannabis your plants produce, as long as it stays at your residence or the place where it was grown. The plant limit is 6 mature, 12 immature and unlimited seedlings per adult, up from 3 mature plants before October 25, 2023.
The catch is the word "at." Off that property, the ordinary 2.5-ounce limit applies again. Plants must be tagged, hidden from public view and secured from anyone under 21, and butane extraction at home is banned under §1503. The full rules are in our guide to growing cannabis at home in Maine (and, with kids in the house, how to safeguard your stash from curious kids).
How are medical patient limits different?
Medical patients in Maine can possess up to 8 pounds of harvested cannabis, under Title 22, section 2423-A. A caregiver can transfer up to 2.5 ounces to a patient in one transaction, and visiting out-of-state patients are held to 2.5 ounces per 15-day period.
Medical and adult-use cannabis can't be sold from the same facility, and Rose Mary Jane is adult-use only. For whether a card makes sense, start with do you need a medical card in Maine, and talk to a healthcare provider about anything health-related.
What happens if you go over the limit?
Carrying more than 2.5 ounces is a crime in Maine, not a ticket. Under 17-A M.R.S. §1107-A, over 2.5 and up to 8 ounces is a Class E crime, punishable by up to six months in jail and a $1,000 fine. Over 8 ounces is Class D, and past a pound, Class C. The excess can be seized (28-B §1504), and over 2.5 ounces lets a court infer furnishing (17-A §1106). This is a summary, not legal advice.
Lighter violations are civil. Public consumption is a fine of up to $100 under §1501(2). Under-21 possession is a $350 to $1,000 civil fine depending on amount, under 22 M.R.S. §2383. Where you can legally use it is covered in where can you smoke weed in Maine.
What ID do you need to buy?
You need a valid, unexpired, government-issued photo ID showing you're 21 or older. A driver's license, state ID or passport works, including out-of-state ones. Visitors should read our Maine cannabis laws for tourists, because crossing a state line with cannabis is a federal problem.
Buying on St John Street
At our Portland shop on St John Street, the limit mostly comes up with visitors who don't realize concentrate has its own cap, and regulars grabbing a dozen THC drinks for a get-together (fine, and nowhere near the line). Your Cannabis Guide will tell you where your basket lands. Our guide on how to read a Maine cannabis label shows where THC per serving and per package are printed.
Frequently asked questions
How much cannabis can you possess in Maine?
Adults 21 and older can possess up to 2.5 ounces of cannabis at any one time, under Title 28-B, section 1501. No more than 10 grams of that can be concentrate, such as vape oil or rosin. Home-grown harvest is the exception, but only at your residence or grow site.
What is the purchase limit at a Maine dispensary?
A licensed Maine cannabis store can sell you up to 2.5 ounces, including no more than 10 grams of concentrate, in a single transaction. The limit is written per transaction, not per day, but the possession limit still applies once you leave, so two purchases can't add up to more.
How much concentrate can you have in Maine?
You can have up to 10 grams of cannabis concentrate, counted inside your 2.5-ounce total. Maine raised this from 5 grams when the change in Public Law 2023, chapter 396 took effect on October 25, 2023. Vape cartridges count by the weight of the oil, so ten 1-gram carts reach the cap on their own.
How much THC can a Maine edible have?
Adult-use edibles in Maine can contain no more than 10 mg of THC per serving and 200 mg per package, under Title 28-B, section 703. The package cap was 100 mg until October 25, 2023. THC drinks follow the same rules because Maine law treats beverages as edible cannabis products.
Do edibles count toward the 2.5-ounce limit?
The concentrate inside an edible counts toward your 10-gram concentrate limit, weighed without the other ingredients. So a gummy's gelatin or a seltzer's water doesn't count. Maine doesn't publish an official edible-to-flower conversion, so your Cannabis Guide can tell you where a mixed basket lands before you pay.
How many plants can you grow in Maine?
Each adult 21 or older can grow up to 6 mature plants, 12 immature plants and unlimited seedlings, up from 3 mature plants before October 25, 2023. Plants must be tagged, hidden from public view and secured from anyone under 21. You can keep everything they produce at your home or grow site.
What happens if you have more than 2.5 ounces in Maine?
More than 2.5 and up to 8 ounces is a Class E crime under 17-A M.R.S. §1107-A, punishable by up to six months in jail and a $1,000 fine. Larger amounts are higher classes of crime, and the excess can be seized under Title 28-B, section 1504. This is general information, not legal advice.
Where to go from here
Short version: 2.5 ounces, 10 grams of concentrate, 200 mg per edible package, ID in your pocket. To build a basket ahead of time, browse the Rose Mary Jane online menu and order for pickup. We'll do the math at the counter either way.