Daily Survival: Knife Carry Laws in California and Your Get-Home Bag

Knife carry laws in California turn on three questions: what kind of knife it is, whether it is concealed, and where you take it. A folding knife that opens by thumb stud is generally fine in a pocket or a pack, a fixed blade is safest worn openly in a sheath at the waist, and an automatic knife with a blade of two inches or more is off the table for carry. Schools, campuses and public buildings add their own limits. This article is general information, not legal advice.

Key points

Penal Code 21310 makes it a crime to carry a dirk or dagger concealed upon the person.
Under Penal Code 16470, a folding knife only counts as a dirk or dagger when its blade is exposed and locked into position.
A knife in a sheath worn openly at the waist is not concealed, according to Penal Code 20200.
Carrying a switchblade with a blade of two inches or more is a misdemeanor under Penal Code 21510; one-hand openers with a detent are excluded from the definition.
K-12 school grounds ban locking folders of any blade length and other knives with blades longer than 2.5 inches.
State and local public buildings ban knives with a fixed or fixable blade longer than four inches.

Why Californians pack a get-home bag in the first place

California has a specific reason to keep a bag in the car or under the desk: the ground moves. The USGS UCERF3 forecast puts the likelihood of one or more magnitude 6.7 or larger earthquakes in the next 30 years (counted from 2014) at 72% for the San Francisco region and 60% for the Los Angeles region. A quake during working hours is the scenario where bridges, transit and phone networks can be disrupted and people may have to walk home.

Preparation is also widespread. In FEMA’s 2023 National Household Survey on Disaster Preparedness, based on 7,604 responses, 48% of respondents said they had assembled or updated disaster supplies in the past year, up from 33% in 2022. The survey is national, not state-level, but in a state of 39,355,309 residents (Census Bureau estimate for July 1, 2025), even part of that rate means a large number of kits, and every kit with a blade in it falls under the rules below.

What the Penal Code actually says about concealed blades

The core rule sits in Penal Code 21310: any person who “carries concealed upon the person any dirk or dagger” can be punished by up to one year in county jail, or by imprisonment under subdivision (h) of Section 1170. Everything depends on what counts as a dirk or dagger, and Section 16470 defines it as a knife or other instrument “capable of ready use as a stabbing weapon that may inflict great bodily injury or death.”

The same section carves out folding knives. A nonlocking folder, a folding knife not prohibited by Section 21510, or a pocketknife only meets that definition “if the blade of the knife is exposed and locked into position.” In plain terms, a closed folding knife in your pocket or pack is not a dirk or dagger, while a fixed blade usually is. If you want the full picture, including state parks and city ordinances, a plain-language summary of knife carry laws in California is a good companion to reading the statutes yourself.

Open carry is the way the code leaves for fixed blades. Penal Code 20200 states that a knife “carried in a sheath that is worn openly suspended from the waist of the wearer” is not concealed within the meaning of Section 21310. The statute names a waist sheath, worn openly, and says nothing about a pack. The cautious reading is to treat a fixed blade zipped inside a get-home bag on your back as concealed.

Switchblades and the two-inch line

Penal Code 17235 defines a switchblade as a knife that looks like a pocketknife, with a blade two or more inches long, released automatically “by a flick of a button, pressure on the handle, flip of the wrist or other mechanical device,” or by the weight of the blade. Spring-blade, snap-blade and gravity knives are all included.

The exclusion matters for anyone choosing a bag knife. A knife that opens with one hand using thumb pressure on the blade or a thumb stud is not a switchblade, provided it has “a detent or other mechanism that provides resistance” to opening, or that biases the blade back toward closed. Check for that detent before you buy a one-hand folder for the bag.

Penal Code 21510 then makes three things a misdemeanor with a switchblade of two inches or more: having it in the passenger’s or driver’s area of a vehicle in a public place, carrying it on the person, and selling or giving it to someone else. For a car kit, that rules out an automatic stashed in the door pocket or the center console.

Schools, campuses and public buildings

Location rules are where a legally packed bag can still get its owner in trouble. Penal Code 626.10(a) bans bringing or possessing on K-12 school grounds any dirk, dagger, ice pick, “knife having a blade longer than 2 1/2 inches,” or “folding knife with a blade that locks into place,” whatever its length. A parent collecting a child with a locking folder clipped to a pocket is covered by that text, even if the blade is short.

Colleges follow a narrower rule. Section 626.10(b) covers dirks, daggers, ice picks and knives with “a fixed blade longer than 2 1/2 inches” on the grounds of a private university, the University of California, the California State University or the community colleges, with exceptions for residences on campus and food preparation. Penal Code 171b adds state and local public buildings and open public meetings, where it bans any knife with a blade over four inches that is fixed or can be fixed in an unguarded position.

The state code is not the last word. Some cities and counties have knife rules of their own, and they can be stricter than state law about carrying in public. A waist sheath that satisfies Section 20200 is therefore not a guarantee everywhere. Before relying on open carry in town, check your own city and county code.

Fixed blade or folder for a California bag?

A fixed blade is stronger for batoning firewood or prying, and it has no pivot to clog with grit. A folder is easier to carry legally in daily life, especially if your route home crosses a campus or a courthouse. One practical split: a fixed blade stays in the vehicle kit, and a non-automatic folder with a short blade rides in the pocket. The table below sums up the statutes quoted above.

Knife type	Concealed in pocket or pack	Open waist sheath	K-12 grounds (626.10(a))	Public buildings (171b)
Fixed blade	Risky: fits the 16470 dirk or dagger definition	Not concealed under 20200	Banned if blade over 2.5 in	Banned if blade over 4 in
Locking folder (thumb stud, detent)	Not a dirk or dagger while closed	Not concealed under 20200	Banned at any blade length	Banned if blade over 4 in
Nonlocking folder or slipjoint	Not a dirk or dagger under 16470	Not concealed under 20200	Banned if blade over 2.5 in	Not named if the blade cannot be fixed
Automatic (switchblade), 2 in or more	Misdemeanor to carry (21510)	Misdemeanor to carry (21510)	Carry already a misdemeanor (21510)	Banned (171b)

Take a concrete case. An Oakland commuter keeps a fixed-blade knife with a five-inch blade in a get-home bag at work. Worn openly on a belt sheath for the walk home after an earthquake, it fits Section 20200. Zipped inside the pack, it loses the sheath exception, and the cautious reading treats it as concealed. Brought into a county courthouse, it falls under Section 171b. The same knife moves through three legal situations in a single afternoon.

FAQ

Can I keep a fixed blade knife in my car in California?

The statutes quoted here do not set a specific vehicle rule for fixed blades, but Section 21310 targets dirks and daggers carried concealed upon the person. Keeping the knife packed in the kit rather than on you is the conservative choice. Switchblades of two inches or more are different: Section 21510 bans them in the driver’s or passenger’s area.

Is there a blade length limit for pocket knives in California?

The state statutes quoted here set no general length limit for a non-automatic folding knife carried concealed. Length matters in specific cases: two inches for switchblades, 2.5 inches on school grounds, and four inches in public buildings. City codes can add more.

Are assisted-opening knives legal in California?

A knife that opens with thumb pressure on the blade or a thumb stud is excluded from the switchblade definition in Section 17235, as long as a detent or similar mechanism resists opening or biases the blade closed. A knife with a blade of two inches or more that fires open from a button on the handle is a switchblade.

This article summarizes statute text for general information. It is not legal advice; for a specific situation, consult a California attorney.

Sources

California Penal Code sections 16470, 17235, 20200, 21310, 21510, 626.10 and 171b, California Legislative Information: leginfo.legislature.ca.gov
FEMA, 2023 National Household Survey on Disaster Preparedness (FEMA document, copy hosted at slaughterbeach.delaware.gov/files/2024/01/2023-National-Household-Survey1.pdf)
U.S. Census Bureau, State Population Totals, Vintage 2025 (NST-EST2025-ALLDATA): www2.census.gov/programs-surveys/popest/datasets/2020-2025/state/totals/
U.S. Geological Survey, Fact Sheet 2015-3009, UCERF3: A New Earthquake Forecast for California’s Complex Fault System (2015): pubs.usgs.gov/fs/2015/3009/

You may also like:

What No One Told You About Your Guns