Iowa

Overview

Iowa runs a limited Medical Cannabidiol Program, administered by Iowa HHS, rather than a full medical marijuana program. Registered patients with qualifying conditions may buy products such as capsules, tinctures, and vaporizable forms from licensed dispensaries, subject to a 4.5-gram THC limit per 90 days unless a provider certifies otherwise under program rules. Smokable flower is not allowed. Possession outside the program remains criminal.

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

What's Legal

Only medical cannabidiol products are legal; smokable cannabis flower is prohibited for all patients.

Possession Limits

4.5g of THC per 90 days for registered patients (medical cannabidiol only)

Home Growing

Not permitted

Driving and Cannabis

Driving while impaired by cannabis is illegal in Iowa, 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.

Iowa Cannabis FAQ

Compare Iowa 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 Iowa.