Is Butterfly Knife Legal in Washington? (2026)

Key facts

Status

Restricted

Permit required

No

Jurisdiction

Washington

Last reviewed

2026-04-09

Butterfly Knife laws in Washington

In Washington State, butterfly knives, also known as balisongs, are subject to restrictions under state law. While not explicitly outlawed for possession, their concealed carry is generally prohibited. Washington Revised Code (RCW) 9.41.250 addresses the unlawful possession of certain deadly weapons, and while butterfly knives are not specifically enumerated, they can fall under broader definitions of prohibited weapons based on their design and potential for rapid deployment. The interpretation and enforcement of these laws can depend on the specific circumstances of possession and carrying. Violations related to the unlawful possession or concealed carry of prohibited weapons, which could include butterfly knives under certain interpretations, are typically classified as gross misdemeanors in Washington State. Penalties for a gross misdemeanor conviction can include fines of up to $5,000 and imprisonment for up to 364 days, as outlined in RCW 9A.20.020. It is important to note that local ordinances within municipalities may impose additional or stricter regulations regarding the possession and carrying of such knives, and it is advisable to consult these local laws as well. While there are no broad statutory exemptions for the possession of butterfly knives in Washington, individuals engaged in specific activities, such as collecting or display in a secure manner not intended for public carrying, may not face the same scrutiny as those carrying them openly or concealed. However, the law primarily focuses on the *manner* of carrying. Travelers should be aware that the Transportation Security Administration (TSA) prohibits butterfly knives in carry-on luggage, and they must be transported in checked baggage according to TSA regulations. Residents are strongly advised to ensure they understand both state and local laws before carrying a butterfly knife in any public space.

Frequently asked questions

Is butterfly knife legal in Washington for travelers?

For travelers visiting Washington, butterfly knife is currently restricted. In Washington State, butterfly knives, also known as balisongs, are subject to restrictions under state law. While not explicitly outlawed for possession, their concealed carry is generally prohibited. Washington Revised Code (RCW) 9.41.250 addresses the unlawful possession of certain deadly weapons, and while butterfly knives are not specifically enumerated, they can fall under broader definitions of prohibited weapons based on their design and potential for rapid deployment. The interpretation and enforcement of these laws can depend on the specific circumstances of possession and carrying. Violations related to the unlawful possession or concealed carry of prohibited weapons, which could include butterfly knives under certain interpretations, are typically classified as gross misdemeanors in Washington State. Penalties for a gross misdemeanor conviction can include fines of up to $5,000 and imprisonment for up to 364 days, as outlined in RCW 9A.20.020. It is important to note that local ordinances within municipalities may impose additional or stricter regulations regarding the possession and carrying of such knives, and it is advisable to consult these local laws as well. While there are no broad statutory exemptions for the possession of butterfly knives in Washington, individuals engaged in specific activities, such as collecting or display in a secure manner not intended for public carrying, may not face the same scrutiny as those carrying them openly or concealed. However, the law primarily focuses on the *manner* of carrying. Travelers should be aware that the Transportation Security Administration (TSA) prohibits butterfly knives in carry-on luggage, and they must be transported in checked baggage according to TSA regulations. Residents are strongly advised to ensure they understand both state and local laws before carrying a butterfly knife in any public space.

Do I need a permit for butterfly knife in Washington?

Washington does not specifically require a permit for butterfly knife, though general regulations apply.

Can I transport butterfly knife through Washington?

Transport laws for butterfly knife in Washington depend on the specific item and your route. Generally, transport is allowed if you comply with state regulations. Always check states you pass through.

What are the penalties for butterfly knife violations in Washington?

Penalties for butterfly knife violations in Washington vary based on the specific offense. Always verify current laws before traveling.