Rubin Law Office

Personal Injury & Criminal Defense Attorney

SCHEDULE YOUR FREE CONSULTATION
(619) 719-1087

Contact
call
california knife laws

California Knife Laws

Last updated on and any changes to the law since then are not reflected in this article.

Key Takeaways

  • California knife laws depend on the knife’s classification, how it is carried, and where it is located at the time of contact with law enforcement.
  • Folding knives are generally legal to carry if they remain in the closed position, and they can be carried in a pocket or bag.
  • Fixed-blade knives are treated as dirks or daggers and must be carried openly in a visible sheath on the waist.
  • Certain knives are prohibited, including switchblades with blades longer than two inches, ballistic knives, and disguised blades such as cane swords.
  • Restricted locations such as schools, courthouses, and government buildings prohibit knives even when they are otherwise legal to possess.
  • Violations can lead to misdemeanor or felony charges, and the outcome depends on whether the prosecution can prove classification, concealment, and compliance with applicable statutes.

The information on this page does not constitute legal advice. Consult an attorney for further guidance before using this information.

You’re pulled over on Carlsbad Boulevard for a routine traffic stop. It’s Friday night, and the bars have recently closed, so you’re not surprised. Even when the police officer searches your car with your consent and finds your butterfly knife in the back, you’re not really concerned: you use it all the time to cut rope and open packages. Therefore, you’re shocked when you’re arrested for violating California knife laws.

In this state, you’re allowed to own and carry many types of knives, such as folding and fixed-blade knives, as long as you obey any associated rules, such as keeping the blade closed or wearing it openly. But other types are prohibited and can subject you to misdemeanor or felony charges. In this article, we’ll review the various California knife laws, how courts interpret terms like “concealed” and “dirk or dagger,” and what you need to know before carrying a blade in California.

white phone

Get answers to your legal questions. Speak with a San Diego County criminal defense lawyer about your case > (619) 719-1087

The legality of carrying a knife in California generally depends on what type of knife it is, how you carry it, and where you take it in public. Here’s a general overview of what you should know before you head out.

  • Folding knives are generally legal when closed. You can carry a standard folding knife (including a pocket knife) in your pocket if the blade is in the folded position. Under California law, a folding knife that isn’t locked open is not treated as a “dirk or dagger.” There’s no statewide blade length limit for typical folding knives, but local ordinances in certain cities may impose extra restrictions.
  • Fixed-blade knives are regulated as “dirks or daggers.” Any fixed-blade knife falls within the definition of a “dirk or dagger” under Penal Code section 16470. You can carry one, but it must be worn openly in a sheath suspended from your waist. If you carry a fixed-blade knife in a way that conceals it, even partially, you can be charged under Penal Code section 21310.
  • Concealed carry is a primary enforcement issue. California law prohibits carrying a concealed dirk or dagger. A knife is considered concealed if it isn’t visible by ordinary observation. This includes knives hidden under clothing, inside a backpack, or otherwise out of sight. Courts look at visibility and accessibility when determining whether a violation has taken place.
  • Switchblades are restricted based on blade length. Under Penal Code section 21510, you can’t carry, possess in public, sell, or transfer a switchblade with a blade longer than two inches. 
  • Certain knives are prohibited regardless of how they’re carried. California bans certain weapons that are considered inherently dangerous or deceptive. They include ballistic knives, which eject a blade as a projectile, and disguised blades such as cane swords. Possession or sale of these items can result in criminal charges.
  • Location-based restrictions exist. For example, you can’t bring knives into restricted locations such as K–12 school grounds, many college campuses, courthouses, or secure government buildings. These restrictions apply even if the knife itself is otherwise lawful to own and carry.
  • Penalties depend on the statute and conduct involved. California knife law violations can be charged as misdemeanors or felonies. Consequences may include jail time, fines, probation terms, and a permanent criminal record that can affect employment and background checks.

This overview outlines the main rules and restrictions. The sections that follow explain how California law defines different knives and how these statutes are enforced across the state.

  • Folding Knives: This category includes pocket knives, Swiss Army knives, and similar tools with blades that fold into the handle. You can carry a folding knife in your pocket, backpack, or purse as long as the blade is in the closed position. However, once the blade is opened and locked into place, the law may treat it as a dirk or dagger. If it’s concealed while in that state, you could face criminal charges.
  • Fixed-Blade Knives: Fixed-blade knives include hunting knives, Bowie knives, and any knife that doesn’t fold. Under California law, these knives are treated as dirks or daggers regardless of size or intended use. You can carry a fixed-blade knife, but it can’t be concealed. 
  • Utility Knives and Work Tools: Many people carry knives as part of their job or to carry out daily tasks. This includes box cutters, multi-tools, and similar equipment used in construction, delivery work, and maintenance. These tools are generally legal to possess and carry when used for legitimate purposes. 

What Knives Are Restricted or Illegal in California?

As you’ve seen, California law prohibits certain knives outright and places strict limits on others. These restrictions are based on how the knife works or whether it is designed to conceal its true function. If you possess one of these knives in violation of the Penal Code, you can face criminal charges regardless of how you intend to use it.

  • Switchblades: A switchblade is defined as a knife with a blade that opens automatically by pressing a button, applying pressure to the handle, or using a spring-loaded mechanism. Under Penal Code section 21510, you can’t carry, possess in public, sell, or transfer a switchblade with a blade longer than two inches.
  • Ballistic Knives: Ballistic knives are illegal in California. These knives are designed to fire a blade as a projectile using a spring-loaded or gas-powered mechanism. There is no exception based on blade length or intended use.
  • Cane Swords and Disguised Blades: California also bans knives that are disguised as other objects. A common example is a cane sword, which conceals a blade inside a walking cane. Other disguised blades may be hidden inside everyday items such as pens, belt buckles, or similar objects.

Overview of California Knife Laws

CategoryKnife TypeDescriptionLegal StatusKey Rule
LegalFolding KnivesPocket knives, Swiss Army knives, and similar tools with blades that fold into the handle.Legal when closedCan be carried in a pocket, bag, or purse if the blade is closed. If opened and locked, it may be treated as a dirk or dagger and can’t be concealed.
LegalFixed-Blade KnivesHunting knives, Bowie knives, and any knife that doesn’t fold.Legal with restrictionMust be carried openly. Can’t be concealed under clothing or inside a bag.
LegalUtility Knives and Work ToolsBox cutters, multi-tools, and similar tools used for work or daily tasks.Generally legalAllowed when used for legitimate purposes. Carry method still matters if the tool fits the definition of a dirk or dagger.
Restricted / IllegalSwitchbladesKnives that open automatically by button, pressure, or spring mechanism.RestrictedIllegal to carry, possess in public, sell, or transfer if the blade is longer than two inches under Penal Code § 21510.
IllegalBallistic KnivesKnives that fire a blade as a projectile using a spring or gas mechanism.IllegalCan’t be possessed, sold, or transferred under any circumstances.
IllegalCane Swords and Disguised BladesKnives hidden in objects like canes, pens, or belt buckles.IllegalProhibited because the blade is concealed within another object.

Where May Knives Be Prohibited in California?

Even if a knife is legal to own and carry, California law restricts where you can bring it. Here’s an overview of locations and spaces where you’ll want to leave the knife at home.

  • K-12 Schools: California Penal Code section 626.10 prohibits bringing certain knives onto K–12 school grounds. This includes dirks, daggers, and other knives capable of ready use as stabbing weapons, along with knives with blades that exceed statutory length limits. The prohibition applies to students, staff, and visitors.
  • Colleges and Universities: Many campuses prohibit fixed-blade knives and restrict larger folding knives through published policies. A violation can result in criminal charges, removal from campus, and administrative discipline.
  • Government Buildings: Knives are restricted in government buildings such as courthouses, city halls, and administrative offices. Security screening is typically in place, and prohibited items are identified at entry points. Attempting to bring a knife into a secured facility can lead to confiscation, denial of entry, or criminal charges.
  • Airports and Public Transit: Airports are regulated under federal law and enforced by the Transportation Security Administration. You can’t bring knives through security checkpoints in carry-on luggage under any circumstances. Knives must be placed in checked baggage if you intend to travel with them.

Private property owners also have the authority to prohibit knives on their premises. This includes businesses, entertainment venues, and event locations that post or communicate weapon restrictions. If you refuse to comply, you can be asked to leave the property. Remaining after notice can lead to trespassing charges under California law. 

Does San Diego County Have Local Knife Laws?

San Diego County Code of Regulatory Ordinances Section 41.117 specifically prohibits the possession of throwing knives within county parks. Aside from this specific recreation-based rule, there are no widespread county ordinances that impose stricter blade length limits or carry methods than those found in the California Penal Code.

Common Defenses to California Knife Charges

If you’re charged under California knife laws, it doesn’t automatically mean you’ll be convicted. Below are some potential defenses that may work, depending on the situation.

  • Improper Classification of the Knife: The prosecution must show that the knife meets the definition of a dirk or dagger under Penal Code section 16470. For example, a folding knife in the closed position doesn’t meet that definition under California law. If the knife doesn’t qualify, a charge based on that classification will likely fail.
  • No Concealment: Penal Code section 21310 applies only to concealed dirks or daggers. If the knife was carried in a visible sheath on the waist, the concealment element is not met. Without concealment, the statute doesn’t apply.
  • Unlawful Search and Seizure: The Fourth Amendment requires law enforcement to conduct lawful searches. If officers discovered the knife during an illegal search, the evidence may be suppressed in court. If the knife is excluded, the prosecution may not be able to proceed.
  • No Immediate Use as a Stabbing Weapon: A dirk or dagger must be capable of ready use as a stabbing weapon. If the knife was not in a usable condition, such as being secured or not readily accessible, this element may not be satisfied. 
  • Lawful Purpose and Context: The circumstances surrounding possession can influence how the case proceeds. For example, carrying a knife as part of your work duties may be raised in defense. While this doesn’t override the statute, it can affect how charges are filed and resolved.

When to Contact a Criminal Defense Attorney for a Knife Charge

If you are arrested or cited for a knife-related offense in California, you should contact a criminal defense attorney. An attorney will analyze whether the knife meets the definition of a dirk or dagger under Penal Code section 16470. They will also determine whether the prosecution can prove that the knife was concealed, which is required for a charge under section 21310. If either element can’t be proven with admissible evidence, the charge may be reduced or dismissed.

Your attorney will also review how law enforcement discovered the knife. If the officer conducted a search without a valid warrant, consent, or legal justification, a motion to suppress evidence can be filed under the Fourth Amendment. If the court grants that motion, the prosecution may be barred from using the knife as evidence at trial.

Arrested Under California Knife Laws? Call Rubin Law Office

If you are facing a knife-related charge, contact Rubin Law Office, P.C at (619) 719-1087 to schedule a consultation. The firm is located at 2292 Faraday Avenue, Suite 100, Carlsbad, CA, and handles criminal defense cases throughout San Diego County. Attorney David Rubin is a former prosecutor who now represents clients in criminal defense matters, so you can count on a strategic and informed defense. To schedule a consultation, call (619) 719-1087 or fill out an online contact form.

California Knife Laws FAQ

Can You Carry a Knife While Hiking or Camping?

Yes, California law does not create an exception for outdoor recreation. A fixed-blade knife must still be carried openly in a sheath suspended from the waist to avoid violating Penal Code section 21310. A folding knife may be carried in a pocket or pack if it remains in the closed position.

Can a Minor Carry a Knife in California?

California statutes don’t impose a blanket prohibition on minors possessing knives outside restricted locations. However, Penal Code section 626.10 prohibits bringing certain knives onto school grounds, and violations can result in criminal charges. Local ordinances may also impose age-based restrictions that apply within city limits.

Can You Carry a Knife at Work?

California law allows possession of knives used as tools in trades such as construction, delivery, and maintenance. The method of carry must still comply with Penal Code section 21310, which prohibits concealed dirks or daggers. A fixed-blade knife used for work must remain visible, and a folding knife must remain closed when carried concealed.

What Happens If a Knife Is Found During a Police Stop?

An officer may examine the knife to determine its type, blade position, and method of carry. The officer will assess whether it meets the definition of a dirk or dagger under Penal Code section 16470 and whether it is concealed under section 21310. If those elements are met, the officer may make an arrest or refer the case for charging.

Do Local City Laws Change Knife Rules?

Yes, California allows cities and counties to adopt local ordinances that impose additional restrictions. For example, some cities limit blade length or restrict possession in certain public areas such as parks or public buildings. You must comply with both state law and any applicable local ordinance where you are present.

Can I Modify a Knife in California?

It’s not recommended. Altering a knife to create an automatic opening mechanism or disguise its appearance can bring it within a prohibited category. For example, Penal Code section 21510 restricts switchblades with blades longer than two inches. Possession of a modified knife that meets this definition can result in criminal liability.

The information on this page does not constitute legal advice. Consult an attorney for further guidance before using this information.

Attorney David Rubin

Attorney David Rubin is a criminal defense and personal injury lawyer based out of Carlsbad, CA. Attorney Rubin serves clients throughout San Diego County and has been practicing law for over a decade. When not working, David can be found surfing, attending CrossFit classes, or eating asado.