Quick answer: Yes, recreational marijuana is legal in Illinois for adults 21 and older, and medical marijuana is legal too. Since June 2026, Illinois residents can possess 60 grams of flower, 10 grams of concentrate and 1,000 mg of THC in products, and visitors can have half those amounts. Home growing is allowed only for registered medical patients, who can grow up to 5 plants.

Last verified: October 20, 2026, against the Illinois Department of Financial and Professional Regulation’s SB 3222 fact sheet. Laws change, so check the official site before you travel or buy.

Who can buy?

Any adult 21 or older with a valid government-issued photo ID, resident or not. Medical patients registered with the state can also buy, and they get perks like lower taxes and higher limits.

Illinois was the first state to legalize adult-use sales through its legislature instead of a ballot vote. Lawmakers have kept adjusting the law since then. The biggest recent change is Senate Bill 3222, signed June 12, 2026 (Public Act 104-0463). It doubled the possession limits right away. It also allows drive-through dispensary windows, permits medical recommendations by telehealth and expands automatic expungement. And it bans the sale of hemp-derived THC products to anyone under 21.

A reminder: recreational marijuana is still illegal under federal law. In April 2026, federal regulators moved state-licensed medical marijuana to Schedule III. Broader rescheduling was paused on September 29, 2026. Federal property stays off-limits, and that includes national forests and federal buildings in Illinois.

Where can you buy?

Only at state-licensed dispensaries. Illinois has a few hundred, and many are run by social equity licensees. Some towns have opted out of allowing stores, so it’s worth looking up locations before you drive anywhere. Under SB 3222, dispensaries can now add drive-through windows if they meet state rules. Delivery and online ordering depend on the store, and payment is usually cash or debit.

Expect taxes on top of the shelf price. Illinois taxes cannabis by THC content and product type, and local taxes are added on top, so prices here are among the highest in the country.

How much can you buy or possess?

Under the updated Cannabis Regulation and Tax Act:

• Illinois residents (21+): 60 grams of cannabis flower, 10 grams of cannabis concentrate and 1,000 mg of THC in infused products such as edibles
• Visitors (21+): 30 grams of flower, 5 grams of concentrate and 500 mg of THC in infused products

These limits are combined, so you can have all three types at once as long as each stays under its cap. Registered medical patients can also possess whatever they’ve grown at home, as long as it stays at home. Before SB 3222, the limits were half these amounts, so you’ll still see older numbers floating around online.

Can you grow your own?

Only if you’re a registered medical cannabis patient. Patients 21 and older can grow up to 5 plants taller than 5 inches in an enclosed, locked space at home, out of public view. Recreational users without a medical card cannot grow at all. Doing so is a civil violation for small numbers of plants and a criminal offense for larger grows.

Setting up a legal grow? If you qualify to grow here, see our beginner guides to LED grow lights, grow tents and leaf trimmers.

Where can you smoke?

Private property, with the owner’s permission. Illinois bans cannabis use in any public place, in any vehicle (even parked), on school grounds, in childcare facilities and near anyone under 21. Landlords, hotels and businesses can prohibit it too. Some cities allow licensed on-site consumption lounges, so check local rules. Using in public can bring a fine.

Can you drive after using?

No. Illinois sets a per se THC limit. Under 625 ILCS 5/11-501.2, you’re presumed under the influence if you have 5 nanograms or more of THC per milliliter of whole blood, or 10 nanograms or more per milliliter of another bodily substance, within two hours of driving. Officers can also charge you based on impairment alone. In a car, cannabis must be in a sealed, odor-proof, child-resistant container, and it can’t be within easy reach of the driver.

Can you take it out of state?

No. Crossing state lines with cannabis is a federal crime, even when you drive into another legal state like Michigan or Missouri. Taking it into Indiana or Wisconsin is especially risky, because both states still prosecute possession. Buy it here, use it here.

Can your employer fire you?

It depends. Illinois’s Right to Privacy in the Workplace Act generally protects lawful use of cannabis off the clock. Employers can still have zero-tolerance and drug-free workplace policies, though, and can discipline you for using at work or showing signs of impairment on the job. Federal contractors, CDL drivers and other safety-sensitive roles follow stricter federal rules.

Penalties, briefly

• Under 21: possession is illegal; penalties and fines apply
• Over the possession limit: fines or criminal charges that increase with the amount
• Using in public or in a vehicle: fines; driving impaired is a DUI
• Selling without a license: criminal charges, up to felonies for larger amounts

Hemp THC products are also changing. SB 3222 aligns Illinois with the federal hemp law passed in November 2025, which ends legal status for intoxicating hemp products like delta-8 and THCA flower. The federal provisions take effect December 11, 2026.

Planning a road trip? See every state in our state marijuana law hub, or check the rules next door in our Indiana marijuana law guide.

Illinois marijuana law FAQ

How much weed can you carry in Illinois in 2026?

Adults 21 and older who live in Illinois can carry up to 60 grams of flower, 10 grams of concentrate and 1,000 mg of THC in infused products. Visitors can carry half those amounts. The limits doubled when SB 3222 was signed on June 12, 2026.

Can tourists buy weed in Illinois?

Yes. Any adult 21 or older with a valid government-issued photo ID can buy at a licensed Illinois dispensary. Out-of-state visitors can possess up to 30 grams of flower, 5 grams of concentrate and 500 mg of THC in products.

Can you grow weed in Illinois?

Only registered medical cannabis patients can grow at home in Illinois, up to 5 plants in a locked, enclosed space out of public view. Adults who aren’t patients cannot legally grow cannabis.

What is the THC driving limit in Illinois?

Illinois presumes a driver is under the influence with 5 nanograms or more of THC per milliliter of whole blood, or 10 nanograms or more per milliliter of another bodily substance, within two hours of driving. Drivers can also be charged based on observed impairment.

Does Illinois accept out-of-state medical cards?

No. Illinois doesn’t offer reciprocity for medical cards from other states. Visiting adults 21 and older can still buy at adult-use dispensaries under the non-resident limits.