How Old Do You Have to Be to Buy Weed?

Twenty-one. In every US state that has legalized adult-use cannabis, the minimum age to buy from a licensed dispensary is 21 — the same threshold those laws use for alcohol. Medical programs are the exception, and they work differently in every state.

Adult-use: 21, with no workarounds

Recreational cannabis laws were written to mirror alcohol regulation, and the age floor came with them. There is no state where an adult-use dispensary can legally sell to someone under 21, and there is no version of this that bends for being 20 and eleven months.

Practically, this means:

• You will be carded every time. Not just on your first visit. Most dispensaries check ID at the door before you enter the sales floor, and again at the register.
• The ID has to be real, current, and government-issued. A state driver's license, state ID card, passport, or military ID. Expired documents are typically refused outright.
• Photocopies and photos of your ID do not work. Neither, at most shops, does a digital wallet ID, though acceptance of mobile IDs is slowly expanding in some states.
• Everyone entering gets carded, including people who are not buying. Bringing an under-21 friend or a child along generally means they cannot come inside.

Budtenders do not have discretion here. Selling to someone underage puts the store's license at risk, so the rule gets enforced strictly regardless of how obvious your age seems.

Medical programs work differently

State medical cannabis programs frequently set a lower age than 21, and some serve minors entirely through a designated caregiver rather than direct purchase.

The common patterns:

1. 18 and over with a qualifying condition and a state registration. This is the most typical adult medical threshold.
2. Under 18 through a registered caregiver, usually a parent or guardian who holds the card, makes the purchase, and administers the product. The minor does not enter the dispensary or buy anything themselves.
3. Additional physician sign-off for younger patients in several programs, sometimes requiring more than one recommending provider.

Which conditions qualify, what documentation is needed, and how long registration takes vary substantially state to state, and programs are amended regularly. Our guide on how to get a medical card covers the general process, but verify the current rules with your state's program directly.

What else changes at 21

Age is not the only rule that applies at the counter. Purchase limits, product-type restrictions, and taxes are all set at the state level and revised often. A few things worth knowing before you go:

• Possession and purchase limits are capped and are usually expressed in ounces of flower with separate equivalents for concentrates and edibles. The numbers differ by state.
• Medical patients often have higher limits than adult-use customers in the same state.
• Some states restrict specific formats or potency levels for adult-use sales even where medical sales of the same product are permitted.
• Reciprocity varies. A medical card from one state may or may not be honored in another, and that is decided state by state.

Never travel across state lines with cannabis, regardless of the laws in either state. Transporting it between states is a separate legal matter from possessing it where you bought it.

Buying online still means proving your age

Ordering ahead does not skip the age check — it moves it. Most legal markets require online orders to be verified in person at pickup or on delivery, with the same ID standard as a walk-in. Some platforms ask you to upload an ID at account creation as well, but that rarely replaces the physical check.

Delivery drivers card at the door and can refuse the handoff if the ID does not clear. The order is generally forfeited or returned in that case.

For the full checklist of what to have on you, see what to bring to a dispensary.

FAQ

Can you buy weed at 18?

Not from an adult-use dispensary anywhere in the US — that requires being 21. Some state medical programs register patients at 18 with a qualifying condition and the required documentation, which permits purchases from medical dispensaries in that state only. Eligibility rules vary and change.

How old do you have to be to buy weed in California?

California sets 21 as the minimum for adult-use purchases, consistent with every other adult-use state. The state's medical program has historically registered patients younger than that with the required physician documentation. State rules are amended periodically, so confirm the current requirements with the state before relying on them.

How old to buy weed in Colorado?

Colorado also uses 21 for adult-use retail. As with California, the medical program operates under separate rules with its own registration process and age provisions. Check the current state guidance rather than assuming the rules match another state you have shopped in.

How to buy weed online?

In legal markets you browse a licensed dispensary's menu, place an order for pickup or delivery, and verify your age with physical ID when you collect it or when the driver arrives. Online ordering changes where the ID check happens, not whether it happens. Which states permit delivery, and under what conditions, varies.

Find a licensed dispensary near you

Browse licensed shops by state and city, compare menus, and check each store's hours and requirements before your trip. Start with the Weedtip dispensary directory, or see our best dispensaries roundups. For adults 21 and over, or registered patients where a state medical program applies. Cannabis laws differ by state and change frequently — always confirm current rules where you live.