Washington

Overview

Washington legalized adult-use cannabis through Initiative 502 in 2012, alongside Colorado. Adults 21+ may possess up to one ounce of usable cannabis, 7 grams of concentrate, 16 ounces of solid infused product, and 72 ounces of liquid infused product. Home grow is not permitted for adult-use consumers. Authorized medical patients may grow a limited number of plants. The Liquor and Cannabis Board regulates the industry.

Last reviewed October 2026. General information, not legal advice.

What's Legal

Public consumption is a civil infraction; consumption at licensed cannabis lounges is permitted.

Possession Limits

1 oz flower; 7g concentrate; 16 oz solid infused product; 72 oz liquid infused product

Home Growing

Not permitted

Driving and Cannabis

Driving while impaired by cannabis is illegal in Washington, as it is in every state, whether or not the cannabis was obtained legally. Officers may rely on field sobriety tests, drug recognition evaluations, and blood tests, and some states set specific THC limits or zero-tolerance rules. Consuming cannabis in a vehicle and carrying open or unsealed packages where the driver can reach them are commonly prohibited. If you have used cannabis, the safest choice is not to drive.

Crossing State Lines and Federal Law

Taking marijuana across state lines is illegal under federal law, even between two states where cannabis is legal, and it may also violate the law of the state you enter. Marijuana is also prohibited on federal land, in national parks, and at airports under TSA jurisdiction. In 2026 the federal government moved FDA-approved products and state-licensed medical marijuana to Schedule III, but adult-use marijuana remains a Schedule I substance, and rescheduling does not legalize interstate transport. Separate federal changes to the legal definition of hemp take effect in late 2026 and will restrict many intoxicating hemp-derived THC products.

Official Resource

Cannabis laws change often, and limits, penalties, and program rules can differ from what is summarized here. This page is general information, not legal advice. Before you rely on any detail, check the official state source below or consult a licensed attorney in Washington.