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Knife Laws in Montana

How Montana law treats knife laws: what is illegal, whether it is a misdemeanor or felony, and the penalties, from the state code.

Short answer: Montana's concealed-weapon offense now applies only to firearms, so the state criminal code no longer restricts carrying a concealed knife, and the former section listing dirks, daggers and switchblades was repealed in 2021. MCA 45-8-316, 45-8-317 (repealed), 45-8-361, 45-8-351

Knife lawsMontana's concealed-weapon offense now applies only to firearms, so the state criminal code no longer restricts carrying a concealed knife, and the former section listing dirks, daggers and switchblades was repealed in 2021. Possessing, carrying or storing a knife with a blade 4 inches or longer, a sword or a straight razor in a public school building is a misdemeanor with up to $500 and/or six months in jail, unless the school trustees gave permission. Local governments may not regulate the possession or open carry of weapons, though they may restrict unpermitted concealed weapons and weapons carried into publicly owned buildings.
Concealed carry: https://mca.legmt.gov/bills/mca/title_0450/chapter_0080/part_0030/section_0160/0450-0080-0030-0160.html; local preemption: https://mca.legmt.gov/bills/mca/title_0450/chapter_0080/part_0030/section_0510/0450-0080-0030-0510.html

More Montana criminal law

FAQ

What knives are legal to carry in Montana?
Montana's concealed-weapon offense now applies only to firearms, so the state criminal code no longer restricts carrying a concealed knife, and the former section listing dirks, daggers and switchblades was repealed in 2021. Possessing, carrying or storing a knife with a blade 4 inches or longer, a sword or a straight razor in a public school building is a misdemeanor with up to $500 and/or six months in jail, unless the school trustees gave permission. Local governments may not regulate the possession or open carry of weapons, though they may restrict unpermitted concealed weapons and weapons carried into publicly owned buildings.
Can I get a court-appointed lawyer for knife laws in Montana?
Montana's rule on court-appointed lawyers: The Office of State Public Defender assigns counsel to eligible applicants; eligibility determinations are subject to the review and approval of the court. An applicant is indigent if 'the applicant's gross household income is at or less than 133% of the poverty level' (federal poverty guidelines) or if disposable income and assets are 'insufficient to retain competent private counsel without substantial hardship to the applicant.' The applicant must provide a detailed financial statement and sign an affidavit on a prescribed form; false statements may be prosecuted. The section does not set an application fee. MCA § 47-1-111
How much does a lawyer for knife laws cost in Montana?
Lawyers set their own fees, and Montana has rules on how they may charge. See hiring a criminal defense lawyer in Montana for fee rules, how to check a lawyer's license and free help.
What happens after an arrest for knife laws in Montana?
How release before trial works in Montana: Before a verdict, the court must either authorize release 'upon reasonable conditions that ensure the appearance of the defendant' and protect the safety of the community or any person, or detain the defendant when there is probable cause to believe the defendant committed an offense for which death is a possible punishment and adequate safeguards are unavailable (§ 46-9-106). The amount of bail must be sufficient to ensure the defendant's presence and compliance with bail conditions and to protect any person from bodily injury; 'not oppressive'; commensurate with the nature of the offense; and considerate of the financial ability of the accused, prior record, history of abscondence, length of residence and community ties, family ties, mental health status and treatment, and employment status (§ 46-9-301). MCA §§ 46-9-106, 46-9-301 What happens after an arrest.
Can a conviction for knife laws be removed from my record in Montana?
Each state sets its own rules for sealing or expunging records. See Montana expungement and record sealing rules.

General legal information, not legal advice. Laws change and local rules can differ; check the linked official source or talk to a lawyer about your situation.