Is Marijuana Legal in Maine? Limits, Driving, and Taxes

Yes, marijuana is legal in Maine. Adults 21 and older can possess up to 2.5 ounces of cannabis (including no more than 10 grams of concentrate), buy from licensed retail stores, and grow a limited number of plants at home.¹ Medical patients with a written certification have broader allowances. Recreational retail sales launched on October 9, 2020, after voters approved legalization in a 2016 referendum.² The possession, purchase, and use rules apply equally to residents and visitors.

Buying Cannabis in Maine

All recreational purchases must happen at state-licensed cannabis stores, and you need a valid government-issued photo ID at the counter. Medical dispensaries and recreational stores operate as separate facilities and cannot sell from the same location.²

Maine’s medical program, established by ballot initiative in November 1999, doesn’t restrict recommendations to a specific list of qualifying conditions.³ A physician or nurse practitioner can certify cannabis for any condition they determine appropriate. A written certification and photo ID are enough to purchase. Qualifying patients may keep up to eight pounds of harvested cannabis at their residence, which replaced the earlier 2.5-ounce cap.⁴

Maine also recognizes out-of-state medical credentials, so a visiting patient can buy here as long as the medical card and photo ID come from the same jurisdiction.⁴

Growing Cannabis at Home

Home cultivation is legal, and the counts depend on which program you fall under.

Recreational growers 21 and older may cultivate up to six mature plants, 12 immature plants, and unlimited seedlings for personal use.⁵ Medical patients and designated caregivers get the same per-person plant counts, with a registered caregiver growing for multiple patients capped at 30 mature and 60 immature plants total.

All growing must happen on the property where you live. Plants cannot be visible from any public road without binoculars or other optical aids, and they must be kept in an enclosed, locked area with security measures sufficient to discourage theft.⁶ You also need to take reasonable steps to keep anyone under 21 from getting to the plants.⁵

Where You Can Use It

Consumption is limited to private property. Smoking, vaping, or eating cannabis in a park, on a sidewalk, in a bar, in a restaurant, or in any other public place is a civil violation with a fine of up to $100.¹ Private doesn’t automatically mean permitted, though. Landlords and rental companies can ban cannabis use and possession on their premises, and that lease provision is enforceable even though the drug is legal statewide.⁴

Driving and Transporting Cannabis

You can carry cannabis in a vehicle within Maine as long as you stay under the personal possession limits. Maine also has a cannabis open-container law that mirrors the one for alcohol. Nobody in the vehicle may consume marijuana or keep an open container in the passenger area while the vehicle is on a public road. An open container is any receptacle with a broken seal or partially removed contents, and the glove compartment counts as passenger area. The trunk or a separate cargo area is the safe spot.⁷

Driving while impaired by cannabis is treated like drunk driving. Maine’s OUI statute covers impairment from alcohol, drugs, or a combination, and the state uses an impairment-based standard rather than a set THC blood level. Prosecutors need to show actual impairment, not just the presence of THC. A first-offense OUI is a Class D crime with a minimum $500 fine (or $600 for refusing a chemical test) and a 150-day license suspension.⁸ Having a passenger under 21 adds mandatory jail time, and repeat offenses within 10 years bring steeper fines, longer suspensions, and mandatory incarceration.

Penalties for Going Over the Limits

Staying under 2.5 ounces is a non-issue. Above that, the consequences step up sharply:

Over 2.5 ounces but under one pound is generally a criminal misdemeanor, with fines and possible jail time.
One pound to 20 pounds creates a legal presumption of intent to sell. That is a Class C crime carrying up to five years in prison and a $5,000 fine.
Over 20 pounds is a Class B crime punishable by up to 10 years in prison and a $20,000 fine.

For minors possessing 2.5 ounces or less, the penalties are civil: up to $100 for a first offense, $300 to $600 for a second, and a flat $600 for a third or later offense. A first-offense record is automatically expunged if the minor stays clean for a year.⁹ Minors caught with more than 2.5 ounces face the same criminal thresholds adults do.

Cannabis and Your Job

Maine gives cannabis users more employment protection than most states, but with real limits. An employer cannot refuse to hire or penalize someone solely for using marijuana off the employer’s property, and cannot refuse to hire or penalize a medical patient solely because of qualifying-patient status.¹⁰

Employers still enforce workplace drug policies and can discipline employees who are under the influence on the job. Pre-employment, random, probable-cause, and other drug testing are permitted if the employer’s testing policy has been approved by the Maine Department of Labor. Because a positive THC test doesn’t prove current impairment, a positive result alone may not be enough for discipline, but paired with evidence of on-the-job impairment or a policy violation, it can be. Federally regulated jobs and positions covered by the Drug-Free Workplace Act carry additional restrictions.¹¹

Where Federal Law Still Reaches

Maine’s laws stop at the state’s authority. Marijuana remains a Schedule I controlled substance federally, and several things that are legal under state law can still bring federal prosecution.

Federal Land

National forests, national parks, and military installations follow federal rules regardless of state law. Possessing any amount of cannabis on National Forest System lands is prohibited, and a first offense carries a mandatory appearance before a federal magistrate along with up to one year in prison and a minimum $1,000 fine.¹² Acadia National Park and other federal sites in Maine are subject to the same rules.

Crossing State Lines

Taking cannabis across any state border is a federal crime, even if both states have legalized it. That covers driving from Maine into New Hampshire and driving from Maine into Massachusetts. Penalties scale with the quantity.¹³

Firearms

Federal law prohibits anyone who is an “unlawful user of or addicted to any controlled substance” from possessing firearms or ammunition. Regular cannabis users fall under that prohibition regardless of state law. A January 2026 ATF rule narrowed the definition of “unlawful user” to require evidence of regular, ongoing use rather than a single incident, but the underlying ban remains.¹⁴ Regular use plus firearm ownership puts you in violation of federal law even inside your own home.

Taxes at the Register

Recreational cannabis is subject to a state excise tax and Maine’s standard sales tax. The excise tax is built in at the cultivation level, so it doesn’t appear as a separate line at checkout, but it’s baked into the price. Medical purchases are exempt from these additional taxes, which is one financial reason many qualifying patients keep their medical certification current even after recreational legalization.

1
Maine State Legislature. 28-B Maine Revised Statutes 1501 – Personal Adult Use of Cannabis and Cannabis Products
2
Office of Cannabis Policy. Regulators Issue Public Reminders as Recreational Marijuana Sales Poised to Begin in Maine
3
National Conference of State Legislatures. State Medical Cannabis Laws
4
Office of Cannabis Policy. Frequently Asked Questions – Section: Maine Medical Use of Cannabis Program
5
Maine State Legislature. 28-B Maine Revised Statutes 1502 – Home Cultivation of Cannabis for Personal Adult Use
6
Legal Information Institute. 18-691 CMR ch. 2, 3 – Cultivation of Marijuana for Medical Use
7
Maine State Legislature. An Act To Promote Highway Safety by Restricting the Use of Marijuana and Possession of an Open Marijuana Container in a Motor Vehicle
8
Maine State Legislature. Title 29-A, 2411 – Criminal OUI
9
Maine Legislature. An Act To Clarify Certain Provisions of the Marijuana Legalization Act
10
Maine Department of Labor. Guide for Employers – Marijuana and Other Substances of Use in the Workplace
11
Office of the Law Revision Counsel. 41 USC 8102 – Drug-Free Workplace Requirements for Federal Contractors
12
U.S. Forest Service. Cannabis Use on National Forest System Lands
13
Office of the Law Revision Counsel. 21 USC 844 – Penalties for Simple Possession
14
Federal Register. Revising Definition of Unlawful User of or Addicted to Controlled Substance