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Montana Cannabis Possession Limits (2026)

Permitted: In Montana, adults 21 and older may possess up to 1 ounce, of which no more than 8 grams may be concentrate and no more than 800 milligrams of THC may be in edibles.

PermittedVerified May 31, 2026

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Official source: mtrevenue.gov →

General legal information, not legal advice — verify important decisions with a licensed attorney.

Cannabis Possession Limits in states bordering Montana

The same rule in each neighboring state LawLert has verified, from that state’s own official source.

IdahoRestricted
Possessing cannabis is illegal in Idaho, and up to 3 ounces is a misdemeanor punishable by up to one year in jail, a fine of up to $1,000, or both, plus a $300 mandatory-minimum fine that took effect January 1, 2026 (HB 7). More than 3 ounces is a felony.
Verified May 31, 2026 · Source: legislature.idaho.gov · Full Idaho rule →
North DakotaConditional
Recreational possession is illegal in North Dakota, but under 14 grams (0.5 ounce) by adults 21 and older is decriminalized — a fine of up to $1,000 and no jail. Registered patients may possess up to 3 ounces of dried flower.
Verified May 31, 2026 · Source: ndlegis.gov · Full North Dakota rule →
South DakotaConditional
In South Dakota, recreational possession by anyone who is not a registered patient is illegal and a misdemeanor. Registered patients may possess up to 3 ounces, plus allowable products per dosage.
Verified Aug 2, 2026 · Source: doh.sd.gov · Full South Dakota rule →
WyomingRestricted
Marijuana is illegal to possess in Wyoming in any form. …
Verified Aug 27, 2026 · Source: wyoleg.gov · Full Wyoming rule →

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