Colorado cannabis purchase limits for residents and visitors

The first question in a Colorado dispensary is the same one asked on January 1, 2014: the person at the check-in desk wants a valid ID showing you are 21 or older, and does not care which state printed it. The second question, how much you may buy, has had the same answer for 12 years: a retail store may sell 1 person no more than 1 ounce of flower, or its equivalent in other products, in a single transaction. Concentrate carries its own cap, written into law by House Bill 21-1317: no more than 8 grams to one person in a single day. Possession is a different and larger number. An adult 21 or over may have up to 2 ounces, so the legal amount to carry is twice the legal amount to buy at once.

The word doing the work in that rule is equivalent. Flower is measured in ounces, but a vape, a jar of wax and a tin of gummies are converted to a flower equivalent under rules set by the state's Marijuana Enforcement Division, and they count against the same ceiling. The law is written against the store, not the shopper: it is the retailer that may not sell past the limit. So a mixed basket is the budtender's arithmetic to do, and on a large order it is worth asking for the total before you pay rather than after.

Visitors used to shop under a smaller rule. Until 2016 a store could sell someone from out of state a quarter ounce at a time while a Colorado resident could buy a full ounce, a two-tier system that turned a driver's license from Kansas into a smaller sale. House Bill 16-1261 repealed the difference that year. A license from Ohio and one from Colorado now buy exactly the same amount.

What visitors get wrong is the relationship between the 2 limits. The 2-ounce figure is the most you may have on you; it is not a shopping allowance, and a budtender will stop a transaction at the 1-ounce line however much you are legally allowed to carry. The other mistake is assuming that because a store sold it to you, you may use it wherever you are standing. The next 2 sections are about that.

Amendment 64 legalized possession in 2012. It never legalized public use, and the gap between those 2 ideas is where most visitors get into trouble. Smoking, vaping or eating cannabis in public is prohibited in Colorado, and the Legislative Council's 2024 handbook spells out what public means: parks, sidewalks, concert venues, restaurants, bars, the common areas of apartment and condominium buildings, and ski resorts. A pre-roll lit on a downtown Denver sidewalk is not a local custom. It is an offense.

The car does not count as private either. Under state law no one in a motor vehicle may use cannabis or have an open container of it, and that covers passengers as well as the driver. The practical rule is dull and reliable: the store's packaging stays closed, and stays in the trunk, until you are somewhere you are allowed to open it.

Hotels are the trap. A hotel is private property, and its owner may forbid cannabis on it; plenty do, and a room key does not overrule the house rules. The lawful public alternative arrived late: House Bill 19-1230, passed in 2019, created marijuana hospitality licenses that permit consumption on a licensed premises where the local government has opted in. In Denver that means a business holding both a state and a city license, and nothing else.

Colorado's legalization ends at a federal boundary sign. Use is illegal on federal land, and the state names national parks and national forests specifically, along with the ski slopes that sit on them. A chairlift on national forest land is federal ground, whatever the resort's address, and the ski resort itself is a public place under state law in any case. Rocky Mountain National Park is a national park; nothing bought in Denver may be used inside it.

The airport is the last place a visitor's purchase can go wrong. Denver International Airport bans the possession, use and transfer of any cannabis product on airport grounds. What you bought in Colorado has to be finished, given away to another adult 21 or over outside the airport, or left behind before the drive to the terminal.

Colorado runs 2 programs, often through the same front door. A registered medical patient buys under the medical program and pays the 2.9% state sales tax; an adult-use buyer pays the 15% retail marijuana sales tax instead, and has not paid the 2.9% on top of it since July 1, 2017, according to the Colorado Department of Revenue. Inside Denver, both pay the city's own sales tax, which carries no medical exemption.

For a visitor none of this changes what the counter will sell. The purchase limits, the 21 age floor and the consumption rules above are the adult-use rules, and they are the ones that apply to anyone walking in with an out-of-state license.

An ounce is a lot of cannabis to carry around a state where you cannot use it in public, in a car or in most hotel rooms, so the useful question is rarely how much you may buy. It is where the best deal on the 1 or 2 items you actually want is today. CloudedDeals reads the published menus of 37 Colorado dispensaries and ranks their deals by category, so you can make 1 purchase at the right store rather than several at the nearest one.