There is no national cannabis purchase limit. Your daily cap is set by your state cannabis regulator and applies per transaction or per day, with separate limits for flower, concentrates, and edibles. Most adult-use states allow between 1 and 3 ounces of flower, 5 to 8 grams of concentrate, and 500 to 1,000 milligrams of THC in edibles per purchase.
What determines the daily purchase limit in my state?
State law sets the number, and the state regulator publishes the exact amounts. Agencies such as the California Department of Cannabis Control, Colorado's Marijuana Enforcement Division, and the Washington State Liquor and Cannabis Board update these rules as laws change.
Does a Purchase Limit Reset Daily or Weekly?
Retailers log every sale into a state seed-to-sale tracking system. That means the limit typically follows your ID, not your receipt.
Dispensary Purchase Limits for Medical Patients: A Buying Guide
Is the limit per transaction or per day?
Some states write limits as per transaction, others as per day, and medical programs sometimes use a rolling window such as 35 days. A per-transaction cap can be repeated in states that do not aggregate daily totals, but your possession limit still applies once you leave the store.
- Per transaction: a single purchase at one register.
- Per day: combined across all licensed retailers in tracked states.
- Rolling window: a total over weeks, common in medical programs.
Typical daily purchase limits by product type
Flower is measured in ounces or grams, concentrates in grams, and edibles in milligrams of THC. Single edible packages often carry their own 100 mg cap, which can stop a sale before the daily milligram limit does.
- Colorado: 1 oz flower, 8 g concentrate, 800 mg edibles per transaction for adult use.
- California: 28.5 g flower and 8 g concentrate per day for adults 21 and older.
- Washington: 1 oz flower, 7 g concentrate, and 16 oz of solid edibles per transaction.
- Illinois: 30 g flower for residents and 15 g for out-of-state visitors.
Do medical patients get higher limits?
Usually yes. Medical programs in Colorado, Oregon, Michigan, and Florida allow larger quantities than the adult-use side, and some states also waive sales tax for patients.
A valid state medical card and matching government ID are required at checkout. Without the card, the budtender must apply the recreational cap even if you qualify for medical status.
Do limits change for out-of-state visitors?
Sometimes. Illinois and a few other states set a lower cap for customers with out-of-state IDs. Most adult-use states treat visitors the same as residents as long as they are 21 or older with valid government ID.
What pitfalls should I watch for at the register?
- Splitting a purchase across two stores to beat a tracked daily cap, which can leave you over the legal possession limit.
- Assuming a flower cap covers concentrates. Most states count them separately.
- Ignoring package caps on edibles, which can block a purchase before the daily milligram limit applies.
- Carrying a legal in-state purchase across state lines or onto federal land, where federal law still applies.
How do I check the exact limit in my state?
- Search your state cannabis regulator's site for purchase limits or possession limits.
- Confirm whether the rule is per transaction, per day, or per rolling period.
- Note separate caps for flower, concentrate, and THC milligrams.
- Ask the dispensary before checkout, since state tracking systems enforce the cap automatically.