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Montana Motorcycle Helmet Law Laws (2026)

Conditional: Montana requires a helmet only for operators and passengers under 18.

ConditionalVerified Jun 18, 2026

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Montana requires a helmet only for operators and passengers under 18. See MCA 61-9-417.

Official source: mca.legmt.gov →

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

Motorcycle Helmet Law in states bordering Montana

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

IdahoConditional
Idaho requires a helmet only for operators and riders under 18. See Idaho Code 49-666.
Verified Jun 18, 2026 · Source: legislature.idaho.gov · Full Idaho rule →
North DakotaConditional
North Dakota requires a helmet only for riders under 18. A passenger riding with an operator who must wear a helmet has to wear one too. See N.D.C.C. 39-10.2-06.
Verified Jun 18, 2026 · Source: ndlegis.gov · Full North Dakota rule →
South DakotaConditional
South Dakota requires a helmet only for riders under 18; adults are exempt. See SDCL 32-20-4.
Verified Jun 18, 2026 · Source: sdlegislature.gov · Full South Dakota rule →
WyomingConditional
Wyoming requires a helmet only for riders under 18; adults are exempt. See Wyo. Stat. 31-5-115.
Verified Jun 18, 2026 · Source: wyoleg.gov · Full Wyoming rule →

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