The short answer
Cannabis possession limits by state come from state law, not federal law. In states with legal recreational cannabis, the typical ceiling for adults 21 and older is 1 to 3 ounces of flower, with concentrates capped by grams and edibles capped by milligrams of THC. Medical-only states tie the limit to a registry card and a supply window rather than a flat ounce number. Hemp-derived CBD with no more than 0.3% delta-9 THC on a dry weight basis sits outside those limits under federal law, though state rules on delta-8 and other hemp intoxicants vary widely.
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None of this is legal advice, and numbers change most legislative sessions. Confirm the current figure with your state's cannabis regulator before you rely on it.
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Typical adult-use limits
Flower caps cluster around an ounce or two. A sample of the better-known ones:
Cannabis Possession Limits for Medical Patients: State Rules and CBD Labels
- California: 1 ounce flower, 8 grams concentrate
- Colorado: 2 ounces flower, plus 6 plants at home with 3 mature
- Illinois: 30 grams flower, 5 grams concentrate, 500 mg THC in edibles
- Massachusetts: 1 ounce in public, 10 ounces at home
- Michigan: 2.5 ounces in public, 10 ounces at home
- New York: 3 ounces flower, 24 grams concentrate
- Oregon: 1 ounce in public, more allowed at home
- Washington: 1 ounce flower, 7 grams concentrate, 16 ounces solid edibles
- Maine: 2.5 ounces
- New Jersey: 1 ounce
Most states count per adult, not per household, so two adults in Colorado can each hold 2 ounces. Public possession often has a lower cap than home storage, which catches people out in Massachusetts, Michigan, and Oregon. Crossing a state line with product is illegal even when both states allow it.
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Medical-only states work differently
Where only medical cannabis is legal, the cap usually reads as a 30-day or 90-day supply on a patient card. Florida, for example, limits smokable flower to 2.5 ounces per 35-day period. Texas runs a low-THC program that caps potency rather than weight, and a handful of states allow only cannabis oil with a set THC percentage. If you hold a card, your allotment lives in the registry system, and dispensaries track it at the point of sale.
Where hemp CBD fits
Confusion shows up here most. Federal law separates hemp from marijuana at 0.3% delta-9 THC on a dry weight basis, so a full-spectrum CBD tincture with trace THC is not the same product category as dispensary flower, and its volume is not counted against a possession limit. That said, some states have moved against delta-8 and similar hemp-derived intoxicants, and a few still treat any THC presence harshly. I check two things before buying: the state's hemp statute and a certificate of analysis from the seller.
How to check your own limit
- Find your state's cannabis authority, usually a commission or department of revenue, not a general government page.
- Look for the possession section of the statute or the regulator's FAQ, which tends to be updated faster than the statute text.
- Note whether the number differs for flower, concentrate, edibles, and public versus private space.
- Check the medical program rules separately if you have a card.
- Recheck after each legislative session, since caps move in both directions.
For CBD shoppers, the practical takeaway is simple. Your bottle of lab-tested hemp oil is governed by the 0.3% rule and state hemp law, while the ounce limits people argue about apply to marijuana. Keep the paperwork for anything you carry, and stay under the lower of the two numbers when you travel within your state.