Idaho marijuana laws prohibit cannabis in every form and for every purpose, with no medical program, no decriminalization, and no recognition of out-of-state medical cards or recreational purchases. The state treats marijuana as a Schedule I hallucinogenic substance under Idaho Code 37-2705, alongside LSD and psilocybin.1Idaho State Legislature. Idaho Code 37-2705 – Schedule I If you are caught with any amount, you face criminal charges. The only cannabis-derived product that is lawful to possess is an FDA-approved medication such as Epidiolex, prescribed for certain severe forms of epilepsy.
Possession Penalties by Amount
Idaho’s possession penalties start as misdemeanors and turn into felonies at a strikingly low threshold.
- Three ounces or less is a misdemeanor punishable by up to one year in jail and a fine of up to $1,000. Anyone 18 or older faces a mandatory minimum fine of $300 that a judge cannot waive.2Idaho State Legislature. Idaho Code 37-2732 – Prohibited Acts A – Penalties
- More than three ounces but less than one pound is a felony carrying up to five years in prison and a fine of up to $10,000.2Idaho State Legislature. Idaho Code 37-2732 – Prohibited Acts A – Penalties
Three ounces is a low felony cutoff by national standards. The statute also defines marijuana broadly to include “all parts of the plants of the genus Cannabis, including the extract or any preparation of cannabis which contains tetrahydrocannabinol,” which puts vape cartridges, edibles, and concentrates under the same weight rules as flower.2Idaho State Legislature. Idaho Code 37-2732 – Prohibited Acts A – Penalties
Growing Any Amount Is a Felony
Idaho has no personal-use exception for cultivation. Growing up to one pound or up to 24 plants can result in up to five years in prison and a fine of up to $15,000.2Idaho State Legislature. Idaho Code 37-2732 – Prohibited Acts A – Penalties A single plant in a closet exposes you to the same felony charge as a commercial operation.
Trafficking and Mandatory Minimums
At one pound or 25 plants, Idaho’s trafficking statute takes over and brings mandatory minimum sentences that judges cannot reduce.3Idaho State Legislature. Idaho Code 37-2732B – Trafficking – Mandatory Minimum Sentences
- 1 to 5 pounds, or 25 to 49 plants: at least one year in prison and a fine of at least $5,000.
- 5 to 25 pounds, or 50 to 99 plants: at least three years in prison and a fine of at least $10,000.
- 25 pounds or more, or 100 or more plants: at least five years in prison and a fine of at least $15,000.
The maximum sentence for any marijuana trafficking conviction is 15 years in prison and a $50,000 fine.3Idaho State Legislature. Idaho Code 37-2732B – Trafficking – Mandatory Minimum Sentences Plants count “regardless of the size or weight,” so seedlings are counted the same as mature plants. Modest home setups have become trafficking cases on that basis alone.
The trafficking statute also applies to anyone who “brings into this state” one pound or more.3Idaho State Legislature. Idaho Code 37-2732B – Trafficking – Mandatory Minimum Sentences A legal purchase in Oregon or Washington becomes trafficking at the Idaho border if the quantity crosses that line.
Paraphernalia Charges
Possession of drug paraphernalia, including pipes, bongs, rolling papers used with cannabis, and vaporizer cartridges, is a misdemeanor carrying up to one year in jail and a fine of up to $1,000.4Idaho State Legislature. Idaho Code 37-2734A – Prohibited Acts D A paraphernalia charge can stand on its own even if no marijuana is found, as long as the items show residue or other evidence of use.
Driving and THC
Idaho applies a zero-tolerance standard to cannabis behind the wheel. Any detectable THC in your system can support a DUI charge, whether or not you are actually impaired at the time of the stop. THC metabolites can linger for days or weeks after use, so someone who consumed cannabis legally in a neighboring state and drove into Idaho later could still face a DUI if tested. A first DUI conviction carries up to six months in jail, a fine of up to $1,000, and a license suspension of up to 180 days.
Crossing the Border With Cannabis
Four of Idaho’s six neighbors, Oregon, Washington, Montana, and Nevada, have legalized recreational cannabis, and Utah allows medical marijuana. None of that matters once you cross into Idaho. Cannabis bought legally at a dispensary an hour from Boise is a criminal offense the moment it enters the state.
State troopers patrol Interstate 84 from Oregon and Interstate 90 from Washington and Montana with cannabis interdiction in mind. The smell of marijuana during a traffic stop gives officers probable cause to search a vehicle. Below the one-pound trafficking line, you are charged under Idaho’s standard possession penalties with no credit for the product’s legal origin. At or above that line, the trafficking statute and its mandatory minimums apply. The rules are the same for Idaho residents returning from a trip and for out-of-state visitors passing through.
CBD and Hemp Products
Idaho legalized industrial hemp in 2021, defining it as cannabis with no more than 0.3% THC on a dry weight basis, consistent with the federal 2018 Farm Bill.5Idaho State Legislature. House Bill No. 126 That threshold is strict. Any product testing above 0.3% THC is legally marijuana under Idaho law and carries the same possession penalties as flower.
This has produced real arrests. Truck drivers hauling industrial hemp through Idaho have been detained when loads tested above the limit. Travelers carrying CBD gummies from a licensed Oregon dispensary have been charged at traffic stops. Full-spectrum CBD products sold openly in neighboring states frequently exceed 0.3%. If you plan to carry a CBD product into Idaho, verify third-party lab results showing THC at or below the limit, and understand that a field test reading differently can still lead to an arrest.
No Medical Program, No Card to Honor
Idaho has no medical cannabis program and no pathway to obtain a medical marijuana card. Medical cards issued by other states carry no weight here. The only cannabis-derived product you can lawfully possess with a prescription is an FDA-approved medication, and that exception exists because of federal approval rather than any state medical cannabis framework.
Reform has not moved. Idaho’s conservative legislative supermajority has shown no interest in medical legalization, and the ballot initiative process requires signatures from at least 6% of qualified voters in 18 of the state’s 35 legislative districts within an 18-month window, a geographic distribution requirement that is especially hard to meet on cannabis.6Idaho Secretary of State. Initiatives and Constitutional Amendments In 2025, both chambers passed House Joint Resolution 4, placing a constitutional amendment on the November 2026 ballot that would give only the legislature the power to legalize marijuana or other psychoactive substances, closing the citizen initiative path entirely if voters approve it. Until something changes, assume Idaho’s prohibition is total and the penalties are what the statutes say they are.