California allows most knives but imposes strict rules on how you carry them. Folding pocket knives can be carried concealed. Fixed blade knives (dirks and daggers) must be carried openly in a sheath. Switchblades with blades over 2 inches are illegal to carry, sell, or possess in a vehicle. These rules come from the California Penal Code, primarily sections 17235, 21310, 21510, 171b, and 626.10.
📌 Key Takeaways: California Knife Laws
- Folding knives: Legal to carry openly or concealed, no blade length limit under state law
- Fixed blades (dirks/daggers): Legal to own, must be carried openly in a sheath – concealed carry is a criminal offense (Penal Code 21310)
- Switchblades: Illegal if the blade is 2 inches or longer (Penal Code 21510)
- Schools: No knives with blades over 2.5 inches, no locking folding knives (Penal Code 626.10)
- Government buildings: No knives with fixed or fixable blades over 4 inches (Penal Code 171b)
- No state preemption: Cities and counties can add their own knife restrictions
Knives That Are Legal to Own in California
California places very few restrictions on knife ownership. You can legally own folding pocket knives of any blade length, fixed blade knives (including hunting knives, Bowie knives, and kitchen knives), daggers, stilettos, and even swords. The restrictions apply to how and where you carry them, not whether you can own them.
Switchblade knives with blades under 2 inches are also legal to own and carry. This means that small automatic knives, such as certain keychain models, are not prohibited under California law. The critical threshold is the 2-inch blade length defined in Penal Code Section 17235.
Knives That Are Prohibited in California
A small number of knife types are outright illegal to possess in California regardless of how you carry them:
- Ballistic knives – knives that project the blade as a projectile (Penal Code 21110)
- Concealed knives disguised as everyday objects – this includes cane swords (Penal Code 20510), air gauge knives (Penal Code 20310), belt buckle knives (Penal Code 20410), lipstick case knives (Penal Code 20610), shobi-zue (Penal Code 20710), and writing pen knives (Penal Code 20910)
These prohibitions exist because the disguised nature of these objects makes them inherently dangerous in public settings. Traditional pocket knives, fixed blades, and even switchblades under 2 inches do not fall into this category.
Switchblade Laws in California (Penal Code 21510)
California Penal Code 21510 makes it a misdemeanor to carry on your person, possess in a vehicle, sell, offer for sale, or give away a switchblade knife with a blade of 2 inches or longer. The penalty is up to 6 months in county jail and/or a $1,000 fine.
The definition of “switchblade” is precise. Penal Code 17235 defines it as a knife with the appearance of a pocketknife whose blade can be released automatically by a button, pressure on the handle, a flick of the wrist, or any mechanical device. However, the law explicitly excludes knives that open with thumb pressure on the blade or a thumb stud, as long as there is a detent or mechanism providing resistance. This means that assisted-opening knives with a thumb stud are legal in California.
Concealed Carry Rules: Folding vs. Fixed Blades
Folding knives may be carried concealed in the folded position. There is no blade length restriction for folding knives under California state law. A 5-inch folding blade in your pocket is legal under state law, though local ordinances may differ.
Fixed blade knives, dirks, and daggers cannot be carried concealed under any circumstances. Penal Code 21310 makes it a wobbler offense (charged as either a misdemeanor or felony at the prosecutor’s discretion) to carry a concealed dirk or dagger. As a misdemeanor, the penalty is up to one year in county jail and/or a $1,000 fine. As a felony, it carries 16 months to 3 years and/or a $10,000 fine.
The critical distinction: a folding knife becomes a “dirk or dagger” when it is in the open and locked position, because it can then be used as a stabbing weapon. You can carry a locking folder concealed as long as it is folded and closed. Once you open and lock the blade, it must be visible.
Open Carry Rules
Fixed blade knives must be carried openly, worn in a sheath attached to your waist. The handle and sheath must be visible – covering them with clothing, even partially, constitutes concealment. There is no blade length restriction for open carry of fixed blades under California state law.
In practice, this means a hunting knife in a belt sheath is perfectly legal to carry through most public spaces in California, as long as the sheath is visible. However, local city and county ordinances may impose additional restrictions, especially in urban areas.
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Location-Specific Restrictions
Schools and Universities (Penal Code 626.10)
California imposes strict knife restrictions on school grounds. Penal Code 626.10 prohibits bringing onto any K-12 school or university campus: dirks and daggers, knives with blades longer than 2.5 inches, folding knives with locking blades, ice picks, and unguarded razors or razor blades.
Government Buildings (Penal Code 171b)
State and local government buildings, including courthouses, have their own restrictions under Penal Code 171b. It is illegal to bring in any knife with a blade over 4 inches that is fixed or capable of being fixed in an unguarded position.
State Parks and Campgrounds
Knives for camping and outdoor use are generally allowed in California state parks and national forests. Standard pocket knives and fixed blade camp knives are appropriate gear for these settings. However, individual park regulations may vary, and displaying a knife in a threatening manner is always illegal under Penal Code 417 (brandishing a weapon).
No State Preemption: Local Laws Can Be Stricter
Unlike some states, California does not have a preemption law for knives. This means that individual cities and counties can enact their own knife restrictions that go beyond state law. Always check local ordinances for the specific city or county you are visiting.
Summary Table: California Knife Carry Rules
| Knife Type | Own | Open Carry | Concealed | Key Statute |
|---|---|---|---|---|
| Folding knife (closed) | Legal | Legal | Legal | – |
| Folding knife (open/locked) | Legal | Legal | Illegal (= dirk) | PC 21310 |
| Fixed blade / dirk / dagger | Legal | Legal (in sheath) | Illegal | PC 21310 |
| Switchblade (blade under 2″) | Legal | Legal | Legal | PC 17235 |
| Switchblade (blade 2″+) | Legal (at home) | Illegal | Illegal | PC 21510 |
| Ballistic knife | Illegal | Illegal | Illegal | PC 21110 |
| Disguised knives | Illegal | Illegal | Illegal | PC 20510-20910 |
Sources
- California Penal Code Section 17235 – leginfo.legislature.ca.gov
- California Penal Code Section 21310 – leginfo.legislature.ca.gov
- California Penal Code Section 21510 – leginfo.legislature.ca.gov
- California Penal Code Section 171b – leginfo.legislature.ca.gov
- California Penal Code Section 626.10 – leginfo.legislature.ca.gov
This article is for informational purposes only and does not constitute legal advice. Knife laws can change, and local ordinances may impose additional restrictions. Consult a licensed attorney for advice on your specific situation.
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