Idaho Sword Laws

A katana on a wall in Boise, a longsword in a Coeur d'Alene studio, a fantasy saber in an Idaho Falls collector's room. Idaho sword laws treat blade law the way the state treats most things: light hand, plenty of trust, and a presumption that adults can handle their own gear. The state's constitutional carry framework was built around firearms, but the same statute covers knives and swords, which makes Idaho one of the cleanest jurisdictions in the country for sword collectors.

Idaho sword laws live in Title 18, Chapter 33 of the Idaho Code. The core provisions are § 18-3302 (concealed weapons, including definitions of "concealed weapon" and "deadly weapon"), § 18-3302A (sale of weapons to minors), § 18-3302C (prohibited conduct), and § 18-3302D (possessing weapons or firearms on school property). HB 620, effective July 1, 2024, added knife preemption to the existing framework, which means local jurisdictions can no longer impose stricter rules. This guide walks through what current Idaho sword laws say and how they apply to traditional swords.

What do Idaho sword laws actually say?

Idaho Code § 18-3302(2) defines "deadly weapon" broadly as any sharp, weighted, or impact instrument capable of inflicting death or serious bodily injury. The same subsection then carves out specific items that are excluded from the deadly weapon definition for purposes of Chapter 33. Two of those exclusions matter to sword collectors:

• Any knife, cleaver, or other instrument intended for use in the processing, preparation, or eating of food
• Any knife with a blade six inches or less

The six-inch exclusion means most pocketknives and shorter blades fall completely outside the concealed-weapons chapter. Swords, of course, sit on the other side of that line. Any blade longer than six inches qualifies as a deadly weapon under Idaho sword laws, but constitutional carry under § 18-3302 then provides a broad license to carry those weapons concealed without a permit.

Is it legal to own a sword in Idaho?

Yes. Idaho sword laws do not restrict the ownership of swords. Katanas, longswords, sabers, machetes, rapiers, kukris, claymores, and fantasy replicas can all be purchased and kept in a private residence without a permit, registration, or background check. There is no blade-length cap on ownership, no inventory limit, and no list of prohibited sword types under Idaho sword laws.

Switchblades, automatic knives, butterfly knives, dirks, daggers, and double-edged blades are also legal to own in Idaho. The state does not maintain a per se prohibited weapon list comparable to California's or New York's, and the framework focuses on carry rather than ownership categories. Section 18-3302A imposes some restrictions on selling weapons to minors, but ordinary adult ownership is unrestricted.

How do Idaho sword laws handle open and concealed carry?

Open carry is unrestricted at the state level under Idaho sword laws. Idaho Code § 18-3302(4)(a) explicitly exempts any deadly weapon "located in plain view" from the concealed-weapons licensing framework. There is no blade-length cap on open carry and no permit requirement. A katana in a sheath on a belt, a longsword in a back-mounted scabbard, or a machete on a hip during a trail run are all lawful under state law.

Concealed carry is also broadly legal under constitutional carry. Idaho Code § 18-3302(4)(f) provides that the concealed-weapons restriction does not apply to any deadly weapon carried by a U.S. citizen who is 18 years of age or older, has not been disqualified under subsection (11), and is outside the limits or confines of any city. For carry inside city limits, the same constitutional carry framework applies to adults 21 and older. Under-21 residents inside cities can obtain a concealed weapons license under § 18-3302K, which is available to qualifying applicants between 18 and 21.

Idaho's posture on blades is the same as its posture on most things. Adults can handle this.

What changed with HB 620 in 2024?

House Bill 620, effective July 1, 2024, added statewide knife preemption to Idaho law. The legislation provides that political subdivisions cannot enact certain rules, ordinances, or taxes regarding knives, with limited exceptions, and that rules and ordinances from a political subdivision that conflict with the state framework are null and void. The preemption complements the existing carry uniformity language in § 18-3302(18).

For sword collectors, this is a meaningful protection in Idaho sword laws. A sword that is lawful to own and carry under the state framework is lawful throughout the state, with no Boise-specific or Coeur d'Alene-specific knife ordinance that can override it. The few remaining sensitive places (school grounds, courthouses, jails, juvenile detention) are governed by separate state statutes rather than local ordinances.

Where can you not carry a sword in Idaho?

Even with one of the most permissive carry frameworks in the country, Idaho sword laws reserve specific locations as no-go zones. Idaho Code § 18-3302D prohibits firearms and weapons on school property. The statute uses the federal "dangerous weapon" definition and treats blades longer than two and a half inches as weapons within the school context, with very limited exceptions for school-approved activities and items in locked compartments inside vehicles.

Other restricted locations under Idaho sword laws include:

• Courthouses (blades longer than 6 inches prohibited)
• Juvenile detention facilities
• Jails and correctional facilities
• Federal buildings (governed by federal law)
• Secure areas of airports past TSA screening
• Public meetings of legislative bodies where weapons are restricted
• Nuclear facilities and similar secure premises
• Private property where the owner posts or requests no weapons

Section 18-3302B also prohibits carrying a concealed weapon while under the influence of alcohol or drugs. Section 18-3303 separately criminalizes the exhibition or use of a deadly weapon in a rude, angry, or threatening manner.

How should collectors transport swords across Idaho?

Transport under Idaho sword laws is one of the cleanest scenarios in the country. A sword in a hard case in the trunk, a katana strapped to a back during a hike, a longsword in original manufacturer packaging, or a sheathed blade openly carried on a belt are all lawful for adults. The state framework imposes no documentation requirement, no notification requirement, and no inspection regime.

The two practical adjustments for collectors are the location-based restrictions (schools, courthouses, jails) and the under-21 city-limits carve-out for concealed carry. For collectors heading to renaissance fairs, knife shows, anime conventions, martial arts dojos, or hunting trips, the path is straightforward. Pack the blade, transport it openly or concealed depending on age and location, and avoid the sensitive places. Idaho sword laws give collectors as much room as almost any state in the country.

The bottom line on owning and carrying swords in Idaho

Idaho sword laws sit at the friendly extreme of the national spectrum. Ownership is unrestricted, open carry is unlimited, and constitutional carry covers most concealed carry scenarios for qualifying adults. HB 620 added statewide knife preemption in 2024, which keeps the rules uniform across the state. The hard limits are schools, courthouses, jails, and the standard secure facilities.

For anyone building a sword collection in Idaho, the practical takeaway is short. Buy what you want, transport responsibly, stay out of the sensitive places, and trust the state framework. Idaho gives collectors more room than almost anywhere else, and the 2024 preemption update closed the last meaningful gap that local ordinances used to create.

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