Are Butterfly Knives Legal in Colorado? (2026)
Yes — Butterfly Knives are legal in Colorado as of 2026.
Quick Answer
Butterfly knives are legal to own and carry in Colorado with no specific restrictions beyond general knife laws. No significant state-level changes, but local ordinances are becoming more common.
- Age restriction: 18+ for purchase
What the Law Says
Colorado law does not explicitly ban butterfly knives, but it is illegal to carry a concealed knife with a blade longer than 3.5 inches. Local jurisdictions may have their own bans.
— C.R.S. 18-12-105
| Category | Details |
|---|---|
| Possession | Legal |
| Sale & Purchase | Legal |
| Penalties | N/A |
| Age Restriction | 18+ for purchase |
| Pending Legislation | None known |
No significant state-level changes, but local ordinances are becoming more common.
Enforcement Reality
Enforcement can be inconsistent due to a legal gray area. While not explicitly illegal, they can be considered gravity knives, which are legal. However, local ordinances may have stricter rules.
A common mistake is carrying a butterfly knife with a blade over 3.5 inches concealed, which is illegal. Many cities also have their own bans.
Local Exceptions
None identified. State law applies uniformly across Colorado. Local ordinances may still vary — check with your city or county government for any additional rules.
Real-World Scenarios: Butterfly Knives in Colorado
Can You Fly With Butterfly Knives Out of Colorado?
Butterfly Knives may be legal in Colorado, but airports are federal territory. TSA screens under federal rules, not state law. If the item is federally restricted, expect problems at the checkpoint. Even if it clears TSA, the laws of your destination state apply the moment you land. Plenty of travelers have learned this the hard way — legal when they packed, criminal when they arrived.
Can You Cross State Lines With Butterfly Knives From Colorado?
This is where people get burned. Colorado treats butterfly knives as legal, but neighboring New Mexico treats it as restricted. The law changes at the state line — not gradually, not with a warning sign, instantly. "I bought it legally" is not a defense in the new state. Interstate highways near the Colorado/New Mexico border are known enforcement corridors. If you're driving with out-of-state plates in a state where butterfly knives is illegal, you're a target.
Bottom Line
Butterfly Knives are legal in Colorado. You can carry them without violating state law, though federal rules and local ordinances may still apply. Always verify current law before acting.
Colorado 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. Colorado falls in the LEGAL category.
View the full 50-state map →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.
Comprehensive Colorado Legal Guides
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