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Montana Boating Under the Influence (BUI) (2026)

Conditional: In Montana it is unlawful to operate a motorboat while under the influence; a person with an alcohol concentration of 0.08 or more is considered under the influence (Montana FWP).

ConditionalVerified Jul 7, 2026

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Official source: fwp.mt.gov →

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

Boating Under the Influence (BUI) in states bordering Montana

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

IdahoConditional
Under the Idaho Safe Boating Act, a person 21 or older is under the influence with a BAC of 0.08% or higher while operating a vessel.
Verified Jul 7, 2026 · Source: parksandrecreation.idaho.gov · Full Idaho rule →
North DakotaConditional
North Dakota's boating-under-the-influence limit is 0.10% by weight (N.D.C.C. 20.1-13-07), higher than the usual 0.08.
Verified Jul 7, 2026 · Source: ndlegis.gov · Full North Dakota rule →
South DakotaConditional
South Dakota's legal blood alcohol limit for operating a vessel under the influence is 0.08 (SD Game, Fish & Parks).
Verified Jul 7, 2026 · Source: gfp.sd.gov · Full South Dakota rule →
WyomingConditional
Wyoming sets the blood alcohol concentration limit for operating a motorized boat at 0.08 percent, the same as for a motor vehicle.
Verified Jul 7, 2026 · Source: wgfd.wyo.gov · Full Wyoming rule →

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