Buying Cannabis in Colorado: Limits, ID, Taxes and Where to Use It

Colorado voters legalized cannabis for adults 21 and over in November 2012 by adding Amendment 64 to the state constitution. In 2026 anyone of age with valid ID can walk into a licensed retail store and buy, whether they live in Denver or are visiting for a ski weekend. The rules that matter are the ones that apply after the purchase: how much you can buy and carry, where you can consume it, and what happens if you drive or leave the state.

This guide sets out those rules as published by the State of Colorado and the Marijuana Enforcement Division (MED), the state regulator, and checked in September 2026. For licensed stores, see our Colorado hub.

Colorado cannabis rules at a glance: 21+, 1 oz per sale, 15% tax

These ten rules cover the purchase, the trip back to your room and the drive home.

Can visitors buy? Yes, at 21+ with any valid government photo ID

You must be 21 or older to buy, possess or use retail cannabis in Colorado, and no residency is required. Under the MED's rules, a store must check your ID twice:

1. once before letting you into the restricted area where products are sold;
2. again before completing the sale.

Both checks require a valid government-issued photo identification showing you are at least 21. The rule does not require Colorado residency, which is why visitors can shop with an out-of-state driver's license or a passport. Nobody under 21 may enter the restricted area, even as a companion.

How much can you buy and carry? 1 oz per transaction, 2 oz possession

MED Rule 6-110 caps a single transaction at one ounce of retail flower or its equivalent.

Buying several times in one day does not reset the limit: repeat sales to the same customer count as one transaction if the store knows, or should know, that they would leave you holding more than an ounce.

Once you leave the store, the possession limit is two ounces for adults 21 and over. You may give up to two ounces to another adult, but you may not sell cannabis, including anything you grow at home. Stores can also refuse a sale for their own reasons.

Medical vs adult-use: medical cards are for Colorado residents only

Colorado runs two separate systems. The Medical Marijuana Registry, managed by the Colorado Department of Public Health and Environment, issues registry cards only to Colorado residents, and the cards are valid only in Colorado. Visitors therefore buy on the retail side, whatever their home state's medical status.

The medical limits come from MED Rule 5-125, which also allows exemptions when a patient's physician documents a need for more.

Taxes at the register: 15% retail marijuana sales tax plus local tax

The Colorado Department of Revenue charges a 15% retail marijuana sales tax on the final consumer price of retail cannabis and cannabis products.

• Retail cannabis is exempt from the ordinary 2.9% state sales tax.
• Non-cannabis items a store sells, such as glassware, apparel and rolling papers, are taxed at 2.9%.
• Local taxes vary: some cities and counties exempt retail cannabis from their sales tax and others do not, so the total depends on where you buy.
• For deliveries, tax is based on the address where you receive the order, not on the store's location.

Where can you legally use cannabis in Colorado? Private property and licensed lounges

Using cannabis in any form, whether smoking, vaping or eating it, is illegal in public places. The state's list:

• sidewalks, parks and amusement parks;
• ski resorts and concert venues;
• businesses, restaurants, cafés and bars;
• the common areas of apartment buildings and condominiums;
• federal land, including national parks, national forests and ski slopes, because cannabis is still illegal under federal law.

Private property is the legal option, but owners can ban both use and possession. Renters may be barred by their lease, and hotels can prohibit cannabis on their premises, so check the policy of your hotel or rental before you arrive.

Consumption lounges: 12 hospitality licenses statewide

Colorado licenses two kinds of venues where consumption is legal. A Marijuana Hospitality Business license allows a premises where cannabis may be consumed; a Retail Marijuana Hospitality and Sales Business license allows cannabis to be both sold and consumed on site. They are rare. The MED's licensed-facilities lists dated 1 September 2026 show 8 hospitality businesses and 4 hospitality-and-sales businesses in the whole state, all of the latter in Denver, against 654 licensed retail stores.

Before you visit a lounge or book a cannabis tour, confirm that the business appears on the MED's current hospitality list.

Driving, vehicles and state lines: 5 ng/ml and no cannabis at airports

Driving high is illegal even though cannabis is legal. According to the state's driving and traveling guidance, you can be arrested for DUI or for driving while ability impaired (DWAI) if alcohol or drugs affect your ability to drive to the slightest degree. If a blood test shows 5 nanograms per milliliter or more of active delta-9 THC, a court can legally assume you were under the influence. Medical use is not a defense to an impaired-driving arrest.

Open packages are also a problem. Neither drivers nor passengers may open cannabis packaging and use the product in a vehicle, even when it is parked. You can be charged if the seal is broken, some of the product is gone and there is evidence it was used in the car.

The state bases these waiting times on research and stresses that they are estimates and that people react differently.

Don't take it home: state lines and airports

Leaving Colorado with any cannabis product is against the law, and you cannot bring cannabis to Denver International Airport or any other airport. That applies even if you are driving to a state where cannabis is also legal. The practical rule for visitors is to buy only what you will use during your stay.

How to tell a Colorado store is licensed: four checks

1. Check the MED list
   The MED publishes lists of licensed facilities, updated monthly, with license numbers and addresses. You can also search the MED Licensee Look-Up Tool.
2. Look at the counter
   A licensed store checks your ID before you reach the sales area and again at the sale, keeps under-21s out, and sells only between 8 a.m. and midnight.
3. Look at the package
   Licensed products come in resealable, child-resistant, opaque packaging, and retail products carry the THC symbol.
4. Keep your receipt
   It records what you bought and when, which helps if you need to show your purchase stayed within the limits.

Sellers that regulators have warned about or acted against appear on the Verdex Red List.