Cannabis possession limits are set by state law, not by the federal government. In most adult-use states, adults 21 and older may legally possess between 1 and 2 ounces of cannabis flower in public, with larger amounts allowed inside a private residence. Dispensaries also enforce per-transaction purchase limits, which are often lower than the possession limit itself.
How much cannabis can you legally possess?
Public possession limits generally range from 1 to 2 ounces of flower in adult-use states, while home storage limits run higher. Limits usually cover total cannabis weight, not just flower, and stores convert concentrates, vapes, and edibles into a flower-equivalent amount.
- Flower: commonly 1 to 2 ounces in public, up to 10 ounces or more at home in some states
- Concentrates: often measured as 1 gram equals several grams of flower
- Edibles: capped by milligrams of THC per package, frequently 100 mg for recreational buyers
Do store purchase limits differ from possession limits?
Yes. A single transaction limit caps how much you can walk out with at one time, while a possession limit caps how much you can legally hold overall. Some states allow you to return the next day and buy the same amount again, provided your total at home stays under the state ceiling.
Expect the budtender to check your ID before checkout and to note your purchase in the state's seed-to-sale tracking system. If you try to exceed the daily purchase cap, the register will typically block the sale.
How do medical cannabis limits compare?
Registered medical patients usually get higher limits than recreational customers, and some states set no possession cap for qualifying patients. Medical limits may be expressed as a 60-day supply or a daily flower-equivalent allowance instead of a flat ounce figure. You generally need an active state medical card or patient ID for those higher limits to apply.
What are typical limits in legal adult-use states?
- Washington: 1 ounce of usable flower, 7 grams of concentrate, 16 ounces of solid edibles
- Colorado: 1 ounce per transaction for residents, with higher home limits up to 2 ounces
- California: 1 ounce of flower or 8 grams of concentrate in public
- Illinois: 30 grams of flower for residents, dropping to 15 grams for out-of-state visitors
Can you carry cannabis across state lines?
No. Crossing a state border with cannabis, even between two legal states, violates federal law and can be prosecuted at the federal level. Possession limits apply only within the state that issued them, and they reset the moment you cross into another jurisdiction.
Does federal law set a possession limit?
No federal possession limit exists for recreational use because cannabis remains a Schedule I controlled substance under the Controlled Substances Act. Small-quantity federal offenses are rarely the focus of enforcement, but the federal prohibition has not been repealed. State limits are the rules that actually apply to everyday purchases and storage.
Frequently asked questions
How much cannabis can you buy at once?
Recreational buyers typically cap out at 1 to 2 ounces of flower per transaction, or the equivalent in concentrates and edibles. Out-of-state visitors often face a lower transaction cap than residents.
Do possession limits count flower only?
No. Limits cover all cannabis products and use a flower-equivalent conversion so that a cartridge or gummy counts toward your total. States publish conversion factors so customers and stores calculate the same way.
What happens if you exceed the possession limit?
Possessing more than the legal limit can bring a civil fine, misdemeanor charge, or escalated penalties depending on the amount and the state. Amounts well above the threshold may be treated as intent to distribute.
Do possession limits apply inside a dispensary?
Purchase limits apply at the register, so the amount you can leave with is capped before you exit. Staff will decline a sale that pushes past the daily or per-transaction threshold.