Yes, butterfly knives (balisongs) are legal in Washington under state law, but local ordinances and federal restrictions may apply.
In Washington, balisongs are not explicitly banned at the state level, but possession or carry may be restricted in certain jurisdictions or contexts. King County and Seattle have historically enforced municipal regulations on blade length and concealed carry, while federal law prohibits possession in restricted areas such as federal facilities. As of 2026, no new statewide prohibitions have been enacted, but compliance officers should monitor updates from the Washington State Liquor and Cannabis Board (WSLCB) and local law enforcement agencies for evolving interpretations of “dangerous weapon” statutes.
Key Regulations for Butterfly Knives (Balisongs) in Washington
- State Blade Length Limits: Washington does not impose a statewide blade length restriction, but local jurisdictions (e.g., Seattle) may enforce limits (typically under 3.5 inches for concealed carry without a permit).
- Concealed Carry Restrictions: Carrying a balisong concealed in public without a valid concealed carry permit (CCW) is prohibited under RCW 9.41.050, which classifies such knives as “dangerous weapons” if carried with intent to intimidate or harm.
- Federal Prohibitions: Under 18 U.S.C. § 930, balisongs are banned in federal buildings, courthouses, and airports, regardless of state legality. Violations may result in federal charges.
Local law enforcement agencies, including the Seattle Police Department and Spokane County Sheriff’s Office, may interpret balisongs as “switchblades” under municipal codes if the blade deploys via a mechanical process, triggering additional restrictions. Consult county-specific ordinances and the Washington State Attorney General’s office for jurisdiction-specific guidance.