Plain-language summaries, not legal advice. Check the official source linked on each rule.
Possession
1 oz (28 g)
Adults 21+ may purchase and possess up to one ounce (28 g) of cannabis; registered medical patients have higher limits. Public consumption is prohibited and can be fined. Possession on federal land within Colorado remains a federal offense.
Retail Sale
Licensed retail; delivery permitted
Retail sales run through Marijuana Enforcement Division (MED) licensed stores, with separate medical and adult-use licenses. Licensed delivery is permitted where the local jurisdiction has opted in. Local governments may ban or cap licenses, so availability varies widely by city and county.
Homegrow
Up to 6 plants (3 flowering)
Adults may grow up to six plants, with no more than three flowering, per person; residences are generally capped at twelve plants unless local rules allow more. Grows must be enclosed, locked and out of public view. Selling homegrown cannabis without a license is illegal.
Advertising
Restricted advertising
Cannabis advertising is restricted to media with reliable evidence that no more than about 30% of the audience is under 21, and outdoor signage, billboards and location-targeted mobile ads are heavily limited. No content may appeal to minors, and health claims are prohibited. Packaging must be child-resistant and carry state warning symbols.