Cannabis possession limits are the maximum amounts of cannabis a person may legally hold under a specific set of rules, and they differ by state, by program, and by product type. There is no single national possession limit in the United States: federal law still prohibits cannabis, while states that have legalized set their own caps for adults and for registered medical patients. Hemp-derived CBD with no more than 0.3% delta-9 THC on a dry weight basis sits in a separate legal category.
Why There Is No Single National Number
Cannabis remains a Schedule I controlled substance under federal law, so federal possession limits for personal use do not exist. States that legalized cannabis created their own possession rules, which means a legal amount in one state can be a criminal amount in the next. Federal enforcement policy has generally stepped back from state medical programs, but federal law itself has not changed, and federal land, airports, and interstate transport follow federal rules.
Cannabis Possession Limits 2025: State and Federal Rules
How Adult-Use Possession Limits Work
Most adult-use states set the cap at one ounce of cannabis flower for people 21 and older. Colorado, California, Oregon, Washington, Nevada, Vermont, and Massachusetts all use roughly that one-ounce figure for what an adult may carry in public. A smaller group of states allows more: Michigan permits 2.5 ounces in public and a larger amount stored at home, and Illinois allows 30 grams of flower for residents. A few details apply almost everywhere:
cannabis possession limits by state
- The limit applies per person, not per household, so two adults can each carry their own legal amount.
- Products must be in a sealed or closed container while in a vehicle, and open containers are treated like open alcohol.
- Possession limits are separate from purchase limits, which often cap how much a dispensary can sell in one transaction.
- Home cultivation is counted separately and is usually capped by plant count rather than weight.
Medical Cannabis Limits Are Usually Different
Registered medical patients often may possess more than adult-use consumers. Many medical programs express the cap as a supply for a set period, such as 30 or 90 days, and print the allowed amount on the patient card or certification. Some states also allow caregivers to hold medicine for a patient, which raises the combined total. A medical card from one state does not travel to another, so a patient who crosses a state line is generally treated under the new state's rules.
Concentrates, Edibles, and Infused Products
Cannabis possession limits rarely apply only to flower. States convert other products into flower equivalents. A common conversion treats a small amount of concentrate or extract, often in the range of several grams, as equal to the full one-ounce flower allowance. Edibles are usually measured in milligrams of THC, with a single package capped at a set number of milligrams and a per-person purchase cap on top of that. Tinctures, capsules, and topicals follow the same pattern. If you buy from a licensed shop, the label states the THC content and the equivalent flower weight.
Hemp-Derived CBD Is a Separate Category
Hemp and hemp-derived CBD are not subject to state cannabis possession limits when the product stays at or below 0.3% delta-9 THC on a dry weight basis, because federal law removed hemp from the definition of marijuana. That said, several states have passed their own restrictions on intoxicating hemp cannabinoids such as delta-8 THC and THCA, and those rules can affect what you may legally possess even though the product is not cannabis flower. For CBD buyers, the practical protection is a batch-specific certificate of analysis (COA) from an ISO-accredited lab that lists total THC, not just delta-9 THC.
What Happens If You Exceed the Limit
Going over a possession limit can mean a civil fine, a misdemeanor, or a felony, depending on the amount, the state, and prior record. Amounts just above the cap are often handled as an infraction with a fine. Larger quantities can trigger intent-to-distribute charges, which carry far heavier penalties. Possession on federal land, including national parks and some airports, is handled under federal law regardless of state rules.
How to Confirm Your Own Limit
- Check your state cannabis regulator's website, which publishes current possession and purchase limits.
- Read your medical program rules if you hold a patient card, since the cap may differ from adult use.
- Check city or county ordinances, because local rules can be stricter than state law.
- Keep the COA for any CBD product so you can show the THC content if a question comes up.
Key Points to Remember
- Cannabis possession limits are set by each state, not by the federal government.
- One ounce of flower is the common adult-use baseline, with some states higher.
- Concentrates, edibles, and tinctures count under conversion or milligram caps.
- Medical patients often have a larger allowed amount than adult-use consumers.
- Hemp-derived CBD at or below 0.3% delta-9 THC follows different rules, and state hemp restrictions still apply.