Idaho Magazine Capacity Laws: No Limits, No Local Bans

Idaho does not restrict magazine capacity. There is no state law limiting how many rounds a magazine can hold, no ban on so-called "large capacity" magazines, and no assault weapons law. Per the NRA-ILA, "Idaho does not have laws restricting 'assault weapons,' 'large capacity' magazines, machine guns, personally made/unserialized firearms, or accelerators (bump stocks, forced reset triggers)."

If you're moving to Idaho from California, Colorado, or any other state with capacity limits -- your legally purchased standard-capacity magazines are welcome here.

Idaho's strong gun-owner protections start at the constitutional level. Article 1, Section 11 of the Idaho Constitution states:

"The people have the right to keep and bear arms, which right shall not be abridged... No law shall impose licensure, registration or special taxation on the ownership or possession of firearms or ammunition. Nor shall any law permit the confiscation of firearms, except those actually used in the commission of a felony."

That language -- no licensure, no registration, no special taxation on firearms or ammunition -- sets the floor. Any magazine restriction would have to clear that bar before it could even get to a Second Amendment federal challenge.

Some states leave a vacuum at the state level and let local governments fill it with their own restrictions. Idaho doesn't work that way.

In 2008, Idaho enacted Idaho Code § 18-3302J, which declares that "uniform laws regulating firearms are necessary to protect the individual citizen's right to bear arms" and explicitly states it is "the legislature's intent to wholly occupy the field of firearms regulation within this state."

Section 18-3302J(2) is direct:

"Except as expressly authorized by state statute, no county, city, agency, board or any other political subdivision of this state may adopt or enforce any law, rule, regulation, or ordinance which regulates in any manner the sale, acquisition, transfer, ownership, possession, transportation, carrying or storage of firearms or any element relating to firearms and components thereof, including ammunition."

Magazines fall squarely within "components thereof." A city that tried to pass a 10-round limit would be acting outside its authority under Idaho law.

This isn't just theory. According to a KTVB report from October 2025, Jerome County rescinded a weapons ban at its administration building after a legal review concluded that Idaho's state preemption laws "likely limit the county's authority to impose the prohibition." That's a real-world example of the preemption statute doing exactly what it was written to do.

What Local Governments Can Still Do

Preemption isn't absolute. Counties and cities retain narrow authority to regulate the discharge of firearms within their boundaries -- but even those ordinances cannot touch lawful self-defense, hunting, sport shooting, or target shooting on public land. They can also regulate the location and construction of shooting ranges. That's the extent of local authority on the subject.

During a state of emergency, the preemption protection extends further: per Idaho Code § 46-1008(7), neither the governor nor any government entity can impose restrictions on the lawful possession, transfer, sale, transport, storage, display, or use of firearms or ammunition.

Idaho requires no permit to purchase a firearm and no license to own one. The state constitution's prohibition on "licensure, registration or special taxation" on firearms and ammunition is reinforced by a 2023 statute -- Idaho Code § 18-3326A(2) -- that prohibits state and local government entities from keeping any list, record, or registry of privately owned firearms or their owners, except during a criminal investigation and prosecution.

There is no background check required for private sales under Idaho law. Federal law still applies to licensed dealer sales.

Idaho has no definition of "assault weapon" in state law and no restrictions tied to that category. A rifle with a pistol grip, a folding stock, a threaded barrel, or a detachable magazine that holds 30 rounds is legal to own, possess, and carry under Idaho law.

Bump stocks and forced reset triggers are also specifically noted by the NRA-ILA as unrestricted under Idaho law.

Idaho does not impose additional state-level restrictions on National Firearms Act items beyond what federal law requires. Suppressors, short-barreled rifles (SBRs), short-barreled shotguns (SBSs), and other NFA items are legal to possess in Idaho as long as you've gone through the federal NFA process -- tax stamp, ATF approval, the whole deal. Machine guns manufactured before May 19, 1986 and registered on the federal NFA registry are also legal to possess under federal law, and Idaho adds nothing on top of that.

The Wikipedia summary of Idaho gun laws confirms no NFA weapons restriction at the state level.

According to Everytown Research & Policy, 14 states have adopted policies prohibiting high-capacity magazines. Idaho is not among them.

According to Giffords Law Center, those 14 states are California, Colorado, Connecticut, Delaware, Hawaii, Illinois, Maryland, Massachusetts, New Jersey, New York, Oregon, Rhode Island, Vermont, and Washington. Most define "large capacity" as more than 10 rounds, though Colorado sets the threshold at 15 rounds and Delaware at 17 rounds.

Idaho has none of these restrictions. You can legally purchase, possess, and use a 30-round AR magazine, a 17-round Glock magazine, a 100-round drum -- whatever is federally legal is Idaho legal.

It's worth knowing the history. In 1994, Congress passed the Violent Crime Control and Law Enforcement Act, which banned the manufacture, transfer, and possession of magazines capable of holding more than 10 rounds. That federal ban expired in September 2004 and was not renewed. Since then, no federal magazine capacity restriction has been in effect.

Magazines manufactured before the 1994 ban were legal throughout its duration. Post-2004, there is no federal restriction on magazine capacity for civilian ownership.

While Idaho has no magazine restrictions, it does have laws governing who can possess firearms at all. These are worth knowing because they apply regardless of what you're loading.

Under Idaho Code § 18-3316, any person with a felony conviction in any jurisdiction is prohibited from purchasing, owning, possessing, or having custody or control of a firearm. Exceptions apply if the conviction was expunged, pardoned, or otherwise nullified, or if firearm rights were restored under applicable law.

Minors under 18 generally cannot possess a firearm without written parental permission or parental accompaniment, per Idaho Code § 18-3302E. A separate provision at Idaho Code § 18-3302F makes it a crime for anyone under 18 to possess a handgun, a sawed-off rifle or shotgun, or a fully automatic weapon.

Carrying a concealed weapon while intoxicated or under the influence of drugs is a crime under Idaho Code § 18-3302B, and violations on a college or university campus trigger an automatic three-year license revocation.

Idaho does not regulate or restrict ammunition purchases and does not require background checks for ammunition. There is one narrow restriction: Idaho Code § 18-3308 prohibits selling or giving any minor under 16 any gunpowder, shells, or fixed ammunition, with exceptions for shotgun shells and .22 caliber or smaller rimfire ammunition, unless the minor's parent or guardian has provided written consent.

No magazine feeding ammunition into a firearm changes these rules. A standard-capacity magazine loaded with legal ammunition, owned by a legal possessor, is fully lawful in Idaho.

Even in a state with no magazine restrictions, where you carry still matters. Idaho law prohibits carrying a concealed weapon in:

• Courthouses
• Juvenile detention facilities or jails
• Public or private schools (with limited exceptions for adults with firearms secured and locked in vehicles, and persons authorized by school board trustees)
• School-sponsored activities, regardless of location

Public colleges and universities may restrict carry on their property, but holders of an Idaho Enhanced Concealed Carry License retain carry rights on campus -- with exceptions for student dormitories and residence halls, and posted public entertainment facilities during events.

Private property owners, employers, and businesses may prohibit carrying on their premises, per Idaho Code § 18-3302(25).

Understanding how magazines fit into carry law requires knowing Idaho's carry framework. Idaho is a permitless carry state -- no license is required to carry a firearm openly or concealed as long as you're 18 or older, a U.S. citizen or current member of the armed forces, and not otherwise prohibited from possessing a firearm.

Idaho also issues optional concealed carry licenses -- standard and enhanced -- for those who want reciprocity recognition in other states. The enhanced license requires an 8-hour in-person training course with live fire and is recognized by several states that don't honor the standard license.

None of Idaho's carry licensing structure imposes any magazine capacity requirement.

If you're driving from Idaho to a neighboring state with a loaded standard-capacity magazine, you need to know that state's law -- Idaho's permissiveness does not travel with you.

• Washington: Manufacture, distribution, and sale of magazines over 10 rounds prohibited as of July 1, 2022. Possession remains legal.
• Oregon: Ballot Measure 114 bans sale, transfer, and importation of magazines over 10 rounds. Possession with some restrictions is legal. Due to litigation, the law's implementation has been complicated -- consult current legal guidance before traveling.
• Nevada: No magazine capacity restriction.
• Montana: No magazine capacity restriction.
• Wyoming: No magazine capacity restriction.
• Utah: No magazine capacity restriction.

For Washington and Oregon specifically, if you're driving through with 30-round magazines, you need to understand those states' current law before your wheels cross the state line. The Firearm Owners Protection Act (FOPA) provides a federal safe passage provision for lawful transport, but it applies to unloaded firearms in locked containers -- not necessarily to magazines in the same way courts have interpreted it in all circumstances. When traveling to states with magazine restrictions, consult an attorney.

Idaho does not have a red flag law (also called an Extreme Risk Protection Order, or ERPO). Per the NRA-ILA, "Idaho does not have a 'red flag' law." There is no mechanism under Idaho state law for a court to order the temporary seizure of firearms based on a risk assessment without a criminal conviction.

According to the NRA-ILA, the Idaho Legislature convened its 2026 session on January 12, 2026. House Bill 621, a concealed carry clarification bill, was introduced in the House State Affairs Committee as of March 2, 2026. Based on sources available, no legislation restricting magazine capacity has been introduced or is pending in the 2026 session.

Sources do not contain details about the full content of H0800 (referenced in a legislature.idaho.gov PDF snippet) sufficient to report on its provisions.

Idaho imposes zero magazine capacity restrictions, and state preemption law ensures no city or county can change that -- a position backed by both the state constitution and Idaho Code § 18-3302J.

• https://giffords.org/lawcenter/state-laws/preemption-of-local-laws-in-idaho/
• https://www.nraila.org/gun-laws/state-gun-laws/idaho/
• https://giffords.org/lawcenter/gun-laws/policy-areas/hardware-ammunition/large-capacity-magazines/
• https://everytownresearch.org/rankings/law/high-capacity-magazines-prohibited/
• https://en.wikipedia.org/wiki/Gun_laws_in_the_United_States_by_state

Last Updated: March 05, 2026