Double-edged knives are legal to own and legal to carry in California, but only one carry method works under state law: openly, in a sheath suspended from your waist. Concealing a double-edged knife on your person is a crime that prosecutors can charge as either a misdemeanor or a felony, and several locations and cities ban even proper open carry.
Why the Law Treats Double-Edged Knives Differently
California Penal Code 16470 defines a “dirk” or “dagger” as any knife or instrument that can be readily used as a stabbing weapon capable of inflicting serious injury or death.1California Legislative Information. California Code PEN – Section 16470 A double-edged blade fits that description almost automatically. Two sharpened edges make the knife inherently effective as a stabbing weapon, and once a knife qualifies as a dirk or dagger, a stricter set of carry rules applies that ordinary single-edged kitchen or hunting knives never trigger.
The Only Legal Way to Carry One
Penal Code 20200 states that a knife carried in a sheath worn openly and suspended from the waist is not considered concealed.2California Legislative Information. California Code PEN 20200 That is the method the statute recognizes. A belt sheath, visible to anyone around you, satisfies the rule.
Carry methods that seem similar do not qualify. Clipping the knife inside your waistband, tucking it under a jacket on a shoulder harness, dropping it in a backpack, or slipping it in a pocket all count as concealment even if the handle is partly visible. “Concealed” under California law means hidden from ordinary observation, and anything short of a sheath openly worn on the waist invites that reading.
What Concealed Carry Costs You
Penal Code 21310 makes it a crime to carry a concealed dirk or dagger on your person, and the offense is a wobbler. Prosecutors can charge it as a misdemeanor carrying up to one year in county jail and a fine of up to $1,000, or as a felony carrying up to three years in county jail and a fine of up to $10,000.3California Legislative Information. California Code PEN 21310 Felony charges are more likely when the defendant has prior convictions or was carrying the knife during another offense. A felony conviction also affects firearm rights, employment, and professional licensing well after the sentence itself.
Folding Knives Work Differently
A double-edged folding knife is not automatically a dirk or dagger. The statute treats folding knives and pocketknives as dirks or daggers only when the blade is exposed and locked into position.1California Legislative Information. California Code PEN – Section 16470 Closed in your pocket, the same knife is not a concealed dirk or dagger. Open the blade and lock it, and the concealment rule applies from that moment on.
If It’s Also a Switchblade
An automatic double-edged knife falls under a separate ban. California defines a switchblade as a knife resembling a pocketknife with a blade of two or more inches that opens automatically by button, spring, gravity, or similar mechanism.4California Legislative Information. California Code PEN – Section 17235 Carrying a switchblade on your person, keeping one in a vehicle in any public area, or selling one is a misdemeanor whether the carry is open or concealed.5California Legislative Information. California Code PEN – Section 21510 Thumb-stud knives that need manual pressure to open are excluded. If your double-edged knife opens automatically, the waist-sheath rule does not save you.
Places Where Open Carry Is Still Illegal
A properly sheathed knife on your belt is still banned in several settings.
Penal Code 626.10 prohibits bringing a dirk, dagger, or any knife with a blade longer than two and a half inches onto the grounds of any K-12 school. The statute also reaches University of California, California State University, California Community Colleges, and private university campuses, with the college provision targeting fixed-blade knives over two and a half inches.6California Legislative Information. California Code PEN – Section 626.10 Violations carry up to one year in county jail or state imprisonment.
Penal Code 171b bans any knife with a fixed blade longer than four inches from state or local public buildings and from meetings that must be open to the public under California’s open-meeting laws. Courthouses, city halls, and public hearing rooms are covered.7California Legislative Information. California Code PEN – Section 171b Most fixed double-edged knives exceed four inches, so this effectively closes government buildings to them.
Federal facilities add another layer. Under 18 U.S.C. 930, knowingly possessing a dangerous weapon in a federal facility is punishable by up to one year in prison, and up to two years in a federal courthouse.8Office of the Law Revision Counsel. 18 USC 930 – Possession of Firearms and Dangerous Weapons in Federal Facilities The statute excludes pocket knives with blades shorter than two and a half inches; a double-edged knife would not qualify.
City Ordinances Can Override the Waist-Sheath Rule
Some California cities restrict knives more tightly than the state does. Los Angeles Municipal Code Section 55.10 prohibits carrying any knife or dagger with a blade of three inches or more in plain view on public streets or in any place open to the public.9American Legal Publishing. Los Angeles Municipal Code SEC. 55.10 The result inside LA city limits is a bind: state law demands open carry in a waist sheath, and the city bans open carry of blades three inches and over. The ordinance includes exceptions for lawful occupation, lawful recreation, recognized religious practice, and travel to or from those activities.
Check local ordinances before you carry anywhere in California. A method that is legal statewide can be a violation a few miles down the road.
Flying With One
TSA prohibits all knives in carry-on luggage and on your person at security checkpoints.10Transportation Security Administration. Knives A double-edged knife can go in checked baggage if the blade is sheathed or securely wrapped. Once you land, the destination state’s law controls, and California’s dirk-and-dagger framework is stricter than most.