No, butterfly knives (balisongs) are illegal in Montana as of 2026 under state statute 45-8-318, which classifies them as “prohibited weapons.” Local law enforcement agencies, including the Montana Department of Justice, enforce this ban uniformly across jurisdictions. Violations may result in misdemeanor charges and confiscation.
Key Regulations for Butterfly Knives (Balisongs) in Montana
- Statutory Prohibition: Montana Code Annotated § 45-8-318 explicitly bans the possession, sale, or transfer of butterfly knives, categorizing them alongside switchblades and gravity knives.
- Enforcement Scope: The Montana Department of Justice and county sheriff’s offices conduct periodic inspections of knife retailers to ensure compliance, with penalties escalating for repeat offenses.
- Penalty Structure: Violations are prosecuted as misdemeanors, punishable by up to 6 months imprisonment and/or a $500 fine, per § 45-8-318(3).