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Montana Switchblade & Automatic Knife Laws (2026)

Permitted: Montana bans no knife by type (switchblade ban repealed 2019) and defines a concealed weapon as only a firearm, so automatic knives are legal to own and carry (MCA 45-8-315).

PermittedVerified Jul 7, 2026

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Official source: mca.legmt.gov →

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

Switchblade & Automatic Knife Laws in states bordering Montana

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

IdahoPermitted
Idaho has no law banning ownership, sale, or carry of automatic/switchblade knives; it regulates only dirks, dirk knives, bowie knives and daggers as concealed deadly weapons (Idaho Code 18-3302).
Verified Jul 7, 2026 · Source: legislature.idaho.gov · Full Idaho rule →
North DakotaConditional
Switchblades/gravity knives are 'dangerous weapons' but not banned to own or open-carry; only concealing one (or any knife 6+ inches) requires a class 2 license (NDCC 62.1-01-01).
Verified Jul 7, 2026 · Source: ndlegis.gov · Full North Dakota rule →
South DakotaPermitted
South Dakota repealed its automatic-knife ban (1976) and ballistic-knife ban (2006); current SDCL ch. 22-14 has no knife-type or blade-length prohibition.
Verified Jul 7, 2026 · Source: sdlegislature.gov · Full South Dakota rule →
WyomingPermitted
No Wyoming statute bans or restricts switchblade, automatic (OTF), gravity or any knife by type; such knives may be freely owned and carried (W.S. Title 6).
Verified Jul 7, 2026 · Source: wyoleg.gov · Full Wyoming rule →

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