Short answer
Cannabis law in the United States is set by each state. No single national rule covers all 50. As of early 2025, 24 states and the District of Columbia allow adults 21 and older to buy cannabis for non-medical use. 38 states allow medical cannabis with a doctor's approval. A short list of states bans the plant for both uses.
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Federal law is separate. Cannabis sits in Schedule I of the Controlled Substances Act. That status applies in every state.
When Did California Legalize Weed?
The four legal categories
- Adult use. Legal for anyone 21 and older. Licensed stores sell flower, edibles, and concentrates.
- Medical only. A patient needs a doctor's certification and a state card or registry entry.
- Low-THC CBD only. A narrow program, often for epilepsy. Indiana and North Carolina run programs of this type.
- Prohibited. Idaho, Kansas, South Carolina, Tennessee, Wisconsin, and Wyoming ban cannabis for medical and adult use.
States with adult-use sales
Alaska, Arizona, California, Colorado, Connecticut, Delaware, Illinois, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, Montana, Nevada, New Jersey, New Mexico, New York, Ohio, Oregon, Rhode Island, Vermont, Virginia, and Washington, plus the District of Columbia. Guam, the Northern Mariana Islands, and the U.S. Virgin Islands also allow adult use.
Cannabis Legal Status by State in 2025
Retail stores were not open in every one of those states in early 2025. Virginia legalized possession in 2021 and had no retail market. Delaware and Minnesota passed adult-use laws, and store openings were still pending.
Medical-only states
Alabama, Arkansas, Florida, Hawaii, Kentucky, Louisiana, Mississippi, New Hampshire, North Dakota, Oklahoma, Pennsylvania, South Dakota, Utah, and West Virginia. Nebraska voters approved a medical measure in 2024. That program was not open in early 2025.
How to check your own state
- Find the state agency that runs the program. Examples: the Washington State Liquor and Cannabis Board, the California Department of Cannabis Control, the New York Office of Cannabis Management.
- Read the possession limit, the age limit, and the rules on public use.
- Check the tax rate and the list of licensed stores.
- Skip blogs and social posts. Codes change, and old pages stay online.
Possession limits differ by state
Colorado allows 2 ounces of flower for adults 21 and older. New York allows 3 ounces of flower and 24 grams of concentrate. Ohio allows 2.5 ounces of flower and 15 grams of extract. Home grow rules vary. Colorado allows up to 6 plants per adult. Washington allows no home grow for adult-use buyers. Medical patients in Washington can grow with an authorization.
Federal law
Cannabis remains a Schedule I drug. Federal agents can enforce the law on federal land, in airports, and at border crossings. In 2024 the DEA started a review of a proposal to move cannabis to Schedule III. That review was not finished in early 2025.
Buying at a licensed store
Bring a government photo ID that proves you are 21 or older. A driver's license, state ID, or passport works in most states. Cash is the common payment. Debit cards work in some shops. Credit card networks do not process cannabis sales. Taxes sit on top of the shelf price. Illinois adds an excise tax of 10 to 25 percent based on THC content, plus state and local sales taxes.
Public use, driving, and travel
Legal states ban use in public and ban driving while impaired. Open containers in a car are illegal. Do not carry cannabis across state lines, into an airport, or onto federal land. Those places fall under federal jurisdiction.
Common questions
Is cannabis legal in all 50 states?
No. Six states ban it for all uses. Several more allow medical use but not adult use.
Can I use an out-of-state medical card?
Some states accept one. Many do not. Ask the shop before you travel.
Does a legal state mean I can grow at home?
No. Home grow rules differ. Some states allow a set number of plants. Others allow none.
Where can I find the exact rule for my state?
Use the state agency website. It posts possession limits, store licenses, and tax rates.