California takes a mixed approach to knives. Owning most of them is legal, but the state sets strict rules on how you carry them. You can carry folding pocket knives concealed. You must carry fixed blade knives, including dirks and daggers, openly in a sheath. Carrying a switchblade with a blade over 2 inches is illegal, as is selling one or keeping one in a vehicle. These rules come mainly from California Penal Code sections 17235, 21310, 21510, 171b, and 626.10.
Knives That Are Legal to Own in California
State law puts very few limits on who can own a knife. You can legally own folding pocket knives of any blade length, along with fixed blade knives such as hunting knives, Bowie knives, and kitchen knives. Daggers, stilettos, and even swords are legal to own too. The restrictions cover how and where you carry a knife, not whether you can have it.
Switchblades with blades under 2 inches are also legal to own and carry, so small automatic knives like certain keychain models fall outside the prohibition. The key threshold is the 2-inch blade length set out in Penal Code Section 17235.
Knives That Are Prohibited in California
A small number of knife types are flatly illegal to possess in California, no matter how you carry them:
- Ballistic knives, which launch the blade as a projectile (Penal Code 21110)
- Concealed knives disguised as everyday objects, including 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 bans exist because disguised weapons are inherently dangerous in public settings. Traditional pocket knives, fixed blades, and switchblades under 2 inches don’t fall into this category.
📌 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
Switchblade Laws in California (Penal Code 21510)
California Penal Code 21510 makes it a misdemeanor to carry a switchblade with a blade of 2 inches or longer on your person, possess one in a vehicle, sell it, offer it for sale, or give it away. A conviction carries up to 6 months in county jail and/or a $1,000 fine.
The law defines “switchblade” precisely. Penal Code 17235 describes it as a knife that looks like a pocketknife and whose blade releases automatically through a button, pressure on the handle, a flick of the wrist, or any other mechanical device. The law expressly excludes knives that open with thumb pressure on the blade or a thumb stud, as long as a detent or similar mechanism provides resistance. So assisted-opening knives with a thumb stud are legal in California.
Concealed Carry Rules: Folding vs. Fixed Blades
You can carry a folding knife concealed as long as it stays folded. State law sets no blade length limit for folding knives, so a 5-inch folding blade in your pocket is legal under state law, though local ordinances may differ.
You cannot carry fixed blade knives, dirks, and daggers concealed under any circumstances. Penal Code 21310 makes carrying a concealed dirk or dagger a wobbler offense, meaning the prosecutor can charge it as either a misdemeanor or a felony. A misdemeanor carries up to one year in county jail and/or a $1,000 fine. A felony carries 16 months to 3 years and/or a $10,000 fine.
The key distinction is that a folding knife becomes a “dirk or dagger” once it’s open and locked, because it can then serve as a stabbing weapon. You can carry a locking folder concealed while it’s folded and closed. Once you open and lock the blade, it must be visible.
Open Carry Rules
You must carry fixed blade knives openly, in a sheath worn at your waist. The handle and sheath both have to be visible, and covering them with clothing, even partially, counts as concealment. State law sets no blade length limit for open carry of fixed blades.
In practice, a hunting knife in a belt sheath is perfectly legal to carry through most public spaces in California, as long as the sheath stays visible. Local city and county ordinances may add further restrictions, especially in urban areas.
Location-Specific Restrictions
Schools and Universities (Penal Code 626.10)
California enforces strict knife rules on school grounds. Penal Code 626.10 bans the following items from 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, courthouses included, follow their own rules under Penal Code 171b. You can’t bring in any knife with a blade over 4 inches that is fixed or can be fixed in an unguarded position.
State Parks and Campgrounds
California state parks and national forests generally allow knives for camping and outdoor use. Standard pocket knives and fixed blade camp knives are appropriate gear in these settings. Individual park regulations may vary, though, and showing a knife in a threatening manner is always illegal under Penal Code 417, which covers brandishing a weapon.
No State Preemption: Local Laws Can Be Stricter
Unlike some states, California has no preemption law for knives. Cities and counties can pass their own knife restrictions that go beyond state law, so check the local ordinances for any city or county you plan to visit.
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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