Does Ammo Have to Be Locked Up in California?

No, California does not have a law that requires ammunition, on its own, to be locked up. The question “does ammo have to be locked up in California” has a narrow legal answer and a broader practical one: the Penal Code’s criminal storage statute targets firearms rather than loose boxes of cartridges, but the Attorney General recommends locking ammunition in a separate container, certain people cannot legally possess any ammunition at all, and ammunition loaded inside a firearm that a child reaches can trigger serious charges.

What State Law Actually Says

Penal Code Section 25100, the “criminal storage of a firearm” statute, is the law people reach for first. Read closely, it covers firearms, not ammunition by itself. It makes it a crime to keep a firearm on premises you control when you know or should know a child is likely to gain access without parental permission, and the child actually does.¹

There is no parallel section creating a crime of “criminal storage of ammunition.” A box of cartridges on a closet shelf is not, by itself, covered. Ammunition enters the criminal picture in two situations: when it’s loaded in a firearm a child accesses, and when the person possessing it is legally barred from having ammunition at all.

What the Attorney General Recommends

The California Attorney General’s office goes further than the statute. Its published safety guidance tells gun owners to “store the ammunition separately in a locked container” and to keep the gun in a different location from the ammunition.²

That guidance is not enforceable on its own. It still matters. If something goes wrong and a prosecutor is weighing whether your storage habits were reasonable, following the AG’s published advice puts you in a far better position than ignoring it. The shortcut of leaving ammunition loose because no statute specifically forbids it is the kind of choice that looks bad after the fact.

When Ammo Storage Does Trigger Criminal Charges

Because ammunition inside a loaded firearm travels with the firearm for storage purposes, the criminal storage law effectively punishes careless ammunition practices whenever a loaded gun is involved. The statute has two tiers based on what happens after a child gains access.

First-degree criminal storage applies when a child obtains access to the firearm and causes death or great bodily injury. It is punishable by 16 months, two years, or three years in state prison, a fine up to $10,000, or both. It can also be charged as a misdemeanor carrying up to one year in county jail and a fine up to $1,000.¹

Second-degree criminal storage applies when a child gains access and carries the firearm to a public place or displays it in a threatening manner. The penalty is up to one year in county jail, a fine up to $1,000, or both.¹

The statute’s defenses are built around secure storage. You are not liable if the child entered the property through an illegal break-in, if the firearm was in a locked container or a location a reasonable person would consider secure, or if the firearm was disabled with a locking device.¹ Notice that the statute speaks only to children gaining access, not to adults or prohibited persons.

Who Cannot Possess Ammunition at All

For some people, storage rules are beside the point: they cannot legally have ammunition in any condition, locked or not. Under Penal Code Section 30305, anyone prohibited from owning a firearm is also prohibited from owning, possessing, or having custody of any ammunition or reloaded ammunition. A violation is punishable by up to one year in county jail or state prison, a fine up to $1,000, or both.³

Federal law adds its own list. Under 18 U.S.C. § 922, the following people are prohibited from receiving or possessing ammunition:

Anyone convicted of a crime punishable by more than one year in prison
Fugitives from justice
Unlawful users of controlled substances, including anyone addicted to a controlled substance
Anyone adjudicated as mentally defective or committed to a mental institution at age 16 or older
Noncitizens unlawfully in the United States, or admitted under a nonimmigrant visa, with limited exceptions
Anyone discharged from the military under dishonorable conditions
Anyone subject to a qualifying restraining order against an intimate partner, or convicted of a misdemeanor crime of domestic violence
Former U.S. citizens who renounced their citizenship

These federal prohibitions apply no matter how carefully the ammunition is stored.⁴ A single round is a separate crime.

What Counts as a Locked Container

If you do choose to lock up your ammunition, or if you need to meet the storage defense under the criminal storage statute for your firearm, California has a specific definition of a “locked container.” Under Penal Code Section 16850, it means a secure container that is fully enclosed and locked by a padlock, key lock, combination lock, or similar locking device. A car trunk qualifies. A glove compartment or center console does not.⁵

For home storage, that points to a gun safe, a dedicated lockbox, or any fully enclosed container with a working lock. A locked room alone may not meet the definition, since the statute speaks to a container rather than a space. The AG’s guidance suggests pairing a locking device on the firearm with a locked storage container.²

Transporting Ammo in a Vehicle

California does not require ammunition carried on its own in a vehicle to be in a locked container. The transport restrictions focus on firearms: a firearm in a vehicle must be unloaded and kept in a locked container or in the vehicle’s trunk.⁵ Ammunition can travel alongside a locked firearm or separately, as long as it is not loaded into the gun.

A sensible practice is to keep ammunition in its own bag or container, away from any firearm in the vehicle. The law does not require it for ammo alone, but mixing loose rounds and an unloaded firearm in the same open space tends to invite questions during a traffic stop.

Local Ordinances May Go Further

State law sets a floor, not a ceiling. California cities and counties can pass stricter storage rules, and some have adopted ordinances requiring firearms to be kept in locked containers inside residences. Some of these local rules may reach ammunition as well. Before relying on state law alone, check the ordinances for the city and county where you store your ammunition. A local police department or city attorney’s office can tell you what applies where you live.

1
Justia Law. California Penal Code Chapter 2 – Criminal Storage of Firearm
2
State of California – Department of Justice – Office of the Attorney General. Firearm Safety
3
California Legislative Information. California Penal Code 30305
4
Office of the Law Revision Counsel. 18 U.S. Code 922 – Unlawful Acts
5
State of California – Department of Justice – Office of the Attorney General. Transporting Firearms in California