Illinois

Overview

Illinois legalized adult-use cannabis through the Cannabis Regulation and Tax Act, and sales began in 2020. Illinois residents 21+ may possess up to 30 grams of flower, 5 grams of concentrate, and 500 mg of THC in infused products. Non-residents may possess half those amounts. Home grow is generally limited to registered medical patients. Licensing is shared among several agencies, including the Department of Financial and Professional Regulation and the Department of Agriculture.

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

What's Legal

Public consumption is prohibited; consumption is allowed on private property where tobacco is also permitted.

Possession Limits

30g flower; 500mg THC concentrate; 5g solid concentrate (residents); half those limits for non-residents

Home Growing

Medical patients only: up to 5 plants

Driving and Cannabis

Driving while impaired by cannabis is illegal in Illinois, 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.

Illinois Cannabis FAQ

Compare Illinois with every other state in our cannabis laws comparison table.

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 Illinois.