Marijuana Decriminalization States Map: A Comprehensive Guide
Discover which states have decriminalized marijuana and how it impacts the cannabis market.
Cannabis Possession Limits by State Map: The Short Answer
There is no national possession limit. Each state sets its own cap, and that cap shifts with your age, your patient status, the product type, and whether you are in public or at home. In adult-use states, the common floor is 1 ounce of flower for anyone 21 and older, with several states allowing 2 to 3 ounces in public and 8 to 10 ounces at home. Medical-only states reserve their limits for registered patients. States with no program treat possession as a crime.
The Three Tiers on a Possession Map
- Adult-use legal: 24 states and the District of Columbia allow possession for adults 21 and older. Public flower limits range from 1 ounce to 3 ounces.
- Medical only: Patients with a valid registry card can possess cannabis. Limits sit inside the medical program, and non-patients get no protection.
- Prohibited or CBD-only: Possession stays illegal. Some states permit CBD with trace THC for specific conditions.
Typical Adult-Use Flower Limits
- California: 1 ounce flower, 8 grams concentrate
- Colorado: 1 ounce flower, 2 ounces for medical patients
- Illinois: 30 grams flower, 5 grams concentrate, 500 mg edible THC
- Massachusetts: 1 ounce in public, 10 ounces at home
- Michigan: 2.5 ounces in public, 10 ounces at home
- Nevada: 1 ounce flower, 3.5 grams concentrate
- New York: 3 ounces flower, 24 grams concentrate
- Oregon: 1 ounce in public, 8 ounces at home
- Washington: 1 ounce flower, 7 grams concentrate, 16 ounces solid edible
These figures reflect state law as of 2025. Lawmakers amend them, so treat any map as a snapshot rather than a fixed rule.
Medical-Only States
Florida, Pennsylvania, Mississippi, and a dozen other states run medical programs without adult-use sales. In these states, the card is the limit. Florida caps flower purchases over a rolling 35-day window, and Pennsylvania requires dispensaries to track a 30-day supply. A visitor from a legal state has no allowance here.
States Where Possession Remains Illegal
Idaho, Wyoming, Kansas, South Carolina, and Wisconsin have no adult-use program and no broad medical access. Possession of any usable amount can lead to arrest, fines, and jail. Kansas and South Carolina allow CBD products with minimal THC under narrow rules. Wisconsin has a CBD law and no medical dispensary system.
What Changes Your Number
- Location: Public possession caps are lower than home storage caps in Massachusetts, Michigan, and Oregon.
- Product type: Concentrates and edibles convert to a THC weight, so 1 ounce of flower does not equal 1 ounce of oil.
- Federal land: National parks, forests, and military bases follow federal law, where possession is a crime.
- Borders and airports: Moving cannabis across state lines or through airport security violates federal law.
- Age: Under 21, the adult-use allowance does not apply even in legal states.
How to Check Your State's Limit
- Confirm your status as an adult 21 or older, a registered patient, or neither.
- Open your state cannabis agency or health department site and find the possession section of the statute.
- Write down the flower, concentrate, and edible caps as three separate numbers.
- Compare the public limit against the home limit.
- Check your city or county code for stricter local rules.
- Set a reminder to review the numbers each year, since legislatures change them.
Federal Status
Cannabis remains a Schedule I controlled substance under federal law. A state map explains state limits, not federal exposure. Possession on federal property or in a state without a program can bring federal charges.