Can You Conceal Carry a Knife in California?

Yes, you can conceal carry a knife in California, but only one kind: an ordinary folding pocketknife carried in the closed position. Fixed-blade knives cannot be concealed at all, and a locking folder carried with the blade open and locked counts as a concealed “dirk or dagger,” which is a crime. Blade length doesn’t decide it. What decides it is whether the blade is exposed and ready to stab.

The Rule That Draws the Line: Dirks and Daggers

California’s concealed-knife ban runs through Penal Code 16470, which defines a dirk or dagger as any knife or instrument capable of ready use as a stabbing weapon that could inflict great bodily injury or death. A non-locking folding knife only falls into that category if its blade is exposed and locked into position.¹

That definition is the whole game. A closed pocketknife in your pocket isn’t a dirk or dagger, so concealing it isn’t a crime. A fixed-blade knife always is one, because the blade is always exposed. A locking folder becomes one the moment the blade is opened and locked. Whether you can legally carry a knife concealed depends entirely on which side of that line the knife sits on when it’s on your person.

Folding Knives: The One Category You Can Conceal

A folding pocketknife carried closed is the one knife you can freely carry concealed in California. Blade length does not matter for this category. A folder with a four-inch blade closed in your pocket is legal. A three-inch fixed-blade knife tucked inside your jacket is not.

Locking folders deserve extra attention because so many everyday-carry knives use liner locks, frame locks, or similar mechanisms. These knives are legal to own and legal to carry, but they must stay closed while concealed. If a locking folder is open and the blade is locked in position while you’re carrying it in a pocket or bag, it qualifies as a concealed dirk or dagger.²

Fixed-Blade Knives Must Be Carried Openly

Every fixed-blade knife is a dirk or dagger under California law because the blade is always exposed. You cannot carry one concealed under any circumstances. You can carry one openly, and Penal Code 20200 is specific about how: the knife must be in a sheath worn openly and suspended from the waist.³

A knife hanging in a belt sheath where anyone can see it satisfies this rule. A sheathed knife tucked inside your waistband, slipped into a backpack, or clipped inside a boot does not. Courts have read the “openly suspended from the waist” language literally, so a sheathed hunting knife on a shoulder strap or in a chest rig may not qualify even though the knife is technically visible. A standard belt sheath is the safe way to do it.

Knives You Cannot Carry at All

Switchblades and Similar Knives

Switchblades with blades of two inches or longer are illegal to carry on your person, keep in a vehicle in any public area, sell, or give away. Concealed or open, it doesn’t matter.⁴ There is no legal way to carry a full-sized switchblade in public in California. Switchblades with blades under two inches fall outside the ban.

The state’s definition sweeps broadly. It covers any knife that resembles a pocketknife with a blade of two or more inches that can be released automatically by a button, pressure on the handle, a flick of the wrist, gravity, or any similar mechanism. Gravity knives and spring-blade knives are included.⁵ Butterfly knives (balisongs) with blades of two inches or more are treated as switchblades under the same definition.

One important carve-out: knives that open with thumb pressure on the blade or on an attached thumb stud are not switchblades, as long as the knife has a detent or other mechanism that resists opening.⁵ Most modern thumb-stud knives fall into this safe category. Button- or switch-operated “assisted openers” do not.

Disguised Knives

California treats several disguised knives as “generally prohibited weapons” that cannot be possessed at all: cane swords, belt buckle knives, lipstick case knives, writing pen knives, air gauge knives, and ballistic knives.⁶ Ownership alone is a crime. Concealment isn’t part of the analysis.

Where Even a Legal Concealed Knife Becomes Illegal

Some places ban knives that would be perfectly legal to carry on the street. These bans apply whether the knife is concealed or open.

K-12 Schools

Penal Code 626.10 bans dirks, daggers, ice picks, any knife with a blade longer than two and a half inches, and folding knives with locking blades on K-12 school grounds, public or private. Only a non-locking folder with a blade of two and a half inches or less is allowed.⁷ A locking folder that’s fine on the sidewalk becomes illegal the moment you step onto school property.

College Campuses

The same statute covers colleges and universities but with a narrower list: dirks, daggers, ice picks, and knives with fixed blades longer than two and a half inches.⁷ Locking folders aren’t banned by this statute on college campuses, though individual schools may set their own rules.

Public Buildings

Penal Code 171b makes it a crime to bring a knife with a blade longer than four inches that is fixed or can be locked into an unguarded position into state or local public buildings, or into meetings that must legally be open to the public.⁸ A three-inch folder is fine; a five-inch sheath knife is not, even carried openly.

Airports

Penal Code 171.5 prohibits knowingly possessing any knife with a blade longer than four inches that is fixed or capable of being locked into an unguarded position in the sterile area of an airport or passenger vessel terminal.⁹ Federal TSA rules are stricter than state law: no knives in carry-on bags except rounded-blade butter knives and plastic cutlery, regardless of blade length. Sheathed or wrapped knives can go in checked luggage.

Federal Buildings

Under 18 U.S.C. § 930, bringing a dangerous weapon into a federal facility is a federal crime. Pocketknives with blades under two and a half inches are exempt. Anything larger can bring up to a year in federal prison.¹⁰

City Ordinances Can Be Stricter Than State Law

California does not preempt local knife laws. Cities and counties can add their own rules, and a knife that’s legal statewide can get you arrested a few miles down the road.

Los Angeles is the clearest example. The city’s municipal code prohibits carrying any knife or dagger with a blade of three inches or more in plain view on any public street or public place, with exceptions for lawful occupations, recreation, and recognized religious practices.¹¹ State law allows open carry of a fixed-blade knife in a belt sheath; LA’s ordinance says you can’t do that within city limits if the blade is three inches or longer. San Francisco has similar restrictions on blades over three inches. If you carry regularly, check the ordinance for any city where you spend time.

Penalties

Concealed Dirk or Dagger

Carrying a concealed dirk or dagger is a wobbler, meaning prosecutors can charge it as either a misdemeanor or a felony depending on the circumstances and your record.²

As a misdemeanor: up to one year in county jail and a fine of up to $1,000.¹²
As a felony: 16 months, two years, or three years in state prison and a fine of up to $10,000.¹²

Switchblade Violations

Carrying, keeping in a vehicle, or transferring a switchblade with a two-inch or longer blade is a straight misdemeanor. Because the statute doesn’t set a specific penalty, the default applies: up to six months in county jail and a fine of up to $1,000.⁴¹³

Restricted Location Violations

Bringing a prohibited knife onto school grounds or into a public building is also a wobbler. A misdemeanor carries up to one year in county jail; a felony can mean state prison time.⁷

The Firearm Consequence

A concealed-knife charge prosecuted as a felony carries a consequence that outlasts the sentence. Under 18 U.S.C. § 922(g), anyone convicted of a felony is permanently barred from shipping, transporting, possessing, or receiving a firearm or ammunition.¹⁰ For a charge that can start with a folder in a pocket, that’s a long tail.

1
California Legislative Information. California Penal Code 16470
2
Justia. CALCRIM No. 2501 – Carrying Concealed Explosive or Dirk or Dagger
3
California Legislative Information. California Penal Code 20200
4
California Legislative Information. California Penal Code 21510
5
California Legislative Information. California Penal Code 17235
6
California Legislative Information. California Penal Code 16590
7
California Legislative Information. California Penal Code 626.10
8
California Legislative Information. California Penal Code 171b
9
California Legislative Information. California Penal Code 171.5
10
Office of the Law Revision Counsel. 18 USC 930 – Possession of Firearms and Dangerous Weapons in Federal Facilities
11
City of Los Angeles. Los Angeles Municipal Code SEC. 55.10
12
California Legislative Information. California Penal Code 672
13
California Legislative Information. California Penal Code 19