Is Butterfly Knives Legal in Montana? (2026)
Yes — Butterfly Knives are legal in Montana as of 2026.
Quick Answer
Butterfly knives are legal to own and carry in Montana with no specific restrictions beyond general knife laws. The most significant recent change was the passage of a state preemption law, which nullified all local knife ordinances.
- Age restriction: 18+ for purchase
What the Law Says
Montana has state preemption for knife laws, meaning local governments cannot enact stricter ordinances. There are no state-level restrictions.
— Mont. Code Ann. § 45-8-361
| Category | Details |
|---|---|
| Possession | Legal |
| Sale & Purchase | Legal |
| Penalties | N/A |
| Age Restriction | 18+ for purchase |
| Pending Legislation | None known |
The most significant recent change was the passage of a state preemption law, which nullified all local knife ordinances.
Enforcement Reality
Montana has state preemption for knife laws, meaning local governments cannot enact stricter ordinances. Enforcement is minimal for all types of knives.
A common mistake is being unaware of the state preemption, leading to confusion about local regulations that are no longer valid.
Local Exceptions
None identified. State law applies uniformly across Montana. Local ordinances may still vary — check with your city or county government for any additional rules.
Bottom Line
Butterfly Knives are legal in Montana. You can carry them without violating state law, though federal rules and local ordinances may still apply. Always verify current law before acting.
Montana vs. the Rest of the US
Across the US, carrying a butterfly knife is fully legal in 39 states, restricted in 10, and illegal in 1. Montana falls in the LEGAL category.
View the full 50-state map →Neighboring States
Laws change at state lines. Here is how bordering states compare on Butterfly Knives:
Frequently Asked Questions
Is it legal to carry Butterfly Knives in Montana?
Can you carry a butterfly knife in Montana?
What is the age restriction for carrying a butterfly knife in Montana?
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Reviewed by cross-referencing the cited state statute against current legislative databases and regulatory publications.
Sources & Verification
This page was reviewed by Ethan Harper by comparing the legal status against the cited state statute. AllowedHere is an informational resource and does not provide legal advice. Consult a licensed attorney for guidance specific to your situation.
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