Is cannabis legal in Colorado for recreational use?
Yes. Adults 21 and older may possess, buy, and grow limited amounts of recreational cannabis in Colorado. Voters approved Amendment 64 on Nov. 6, 2012, with about 55% of the vote. The first legal retail sale took place on Jan. 1, 2014.
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Possession limits for adults
Colorado law sets three caps for personal possession:
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- 1 ounce (28 grams) of cannabis flower
- 8 grams of concentrate
- 800 milligrams of THC in edible products
Amounts above 1 ounce can bring a fine or a criminal charge. Larger quantities that suggest distribution carry heavier penalties.
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Purchase limits inside a store
Colorado residents may buy up to 1 ounce of flower in one transaction. Customers with an out-of-state ID may buy up to 1/4 ounce (7 grams) of flower or 2 grams of concentrate. Edible purchases cap at 800 milligrams of THC per transaction. Stores check a government-issued photo ID at the door and at the register.
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Where use is against the law
- Public places, including sidewalks, parks, plazas, and festival grounds
- Inside a vehicle, running or parked
- Federal land, including national parks, national forests, and federal buildings
- Airport property and Amtrak trains
- Most hotels, rental cars, and ski resort property
Private residences are allowed with the property owner's permission. A small number of licensed hospitality businesses permit indoor use.
Home grow
Adults 21 and older may grow up to 6 plants per person, with a household cap of 12 plants. Plants must sit in a locked space and stay out of public view. Counties and cities may ban outdoor grows.
Driving rules
Colorado law allows a jury to infer impairment at 5 nanograms of THC per milliliter of whole blood. A cannabis container in a vehicle must be sealed and unopened. Passengers may not consume while the vehicle is on a road.
Federal law still applies
Cannabis remains a Schedule I controlled substance under the Controlled Substances Act. Colorado law does not shield anyone from federal charges, and it does not apply on federal property or to federal employees.
Taxes
Colorado charges a 15% state sales tax on retail cannabis, plus a 15% excise tax on cultivation. Cities and counties add their own rates. Total tax at the register varies by address.
Employment
Employers may set their own cannabis policies. A 2023 state law limits action against workers for off-duty use, with exceptions for federal contractors, safety-sensitive roles, and jobs covered by a collective bargaining agreement.