Idaho

Overview

Idaho has some of the strictest cannabis laws in the country. It has no medical program, no adult-use program, and no decriminalization. Possession of any amount of marijuana is a misdemeanor, and larger amounts can bring felony charges. Hemp products are subject to strict state THC rules. Bordering states such as Washington, Oregon, Nevada, and Montana have legal markets, and bringing their products into Idaho is illegal.

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

What's Legal

All forms of cannabis are illegal; only industrial hemp products with zero THC are permitted.

Possession Limits

None — all cannabis is illegal

Home Growing

Not permitted

Recent Changes

Voters will decide HJR 4 on the November 3, 2026 ballot. It would amend the state constitution to give the Legislature sole authority to legalize marijuana and other covered substances, which would remove citizen initiatives as a route. A 2026 medical-cannabis initiative did not qualify.

Driving and Cannabis

Driving while impaired by cannabis is illegal in Idaho, 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 Idaho.