Iowa Knife Laws (2026): Carry, Intent, and Blade Rules

Iowa treats knife carry as an intent-based offense rather than a flat carry ban. A dagger, razor, stiletto, switchblade, or any knife with a blade exceeding five inches is a statutory "dangerous weapon," but Iowa Code § 724.5 expressly says the state's weapons-permit scheme does not impose a general prohibition on otherwise-lawful unlicensed carrying, open or concealed, of a dangerous weapon. Carrying one only becomes a crime when the carrier intends to use it unlawfully against another person, or actually uses it in a crime.

Jurisdiction scope: This page covers Iowa state law only, principally Iowa Code §§ 702.7, 708.8, 724.1, 724.4, 724.4A, 724.4B, 724.4E, 724.5, 724.28, and 719.7. It does not cover Iowa's general assault statutes, which apply to a knife used as a weapon regardless of how it was carried.

Iowa's "dangerous weapon" definition governs everything else

Iowa Code § 702.7 provides:

A "dangerous weapon" is any instrument or device designed primarily for use in inflicting death or injury upon a human being or animal, and which is capable of inflicting death upon a human being when used in the manner for which it was designed, except a bow and arrow when possessed and used for hunting or any other lawful purpose. Additionally, any instrument or device of any sort whatsoever which is actually used in such a manner as to indicate that the defendant intends to inflict death or serious injury upon the other, and which, when so used, is capable of inflicting death upon a human being, is a dangerous weapon. Dangerous weapons include but are not limited to any offensive weapon, pistol, revolver, or other firearm, dagger, razor, stiletto, switchblade knife, knife having a blade exceeding five inches in length, or any portable device or weapon directing an electric current, impulse, wave, or beam that produces a high-voltage pulse designed to immobilize a person.

This is the definition every knife offense on this page turns on. Four knife types are named specifically, with no length threshold: a dagger, a razor, a stiletto, and a switchblade knife. Separately, any other knife becomes a "dangerous weapon" once its blade exceeds five inches, regardless of type. A shorter, ordinary folding or fixed-blade knife falling outside both the named-type list and the five-inch threshold is not a statutory dangerous weapon under this section, though the statute's second sentence can still reach any instrument actually used to threaten death or serious injury, regardless of its type or length.

Can you carry a knife openly or concealed in Iowa?

Iowa Code § 724.5 provides that a permit to carry weapons is not to be read as imposing a general ban on lawful unlicensed carry:

The availability of a professional or nonprofessional permit to carry weapons under this chapter shall not be construed to impose a general prohibition on the otherwise lawful unlicensed carrying or transport, whether openly or concealed, of a dangerous weapon, including a loaded firearm.

Carrying a dagger, razor, stiletto, switchblade, or knife with a blade over five inches, open or concealed, is not by itself a crime in Iowa. It becomes one only under the intent-based statutes below.

Going armed with intent: when carrying becomes a crime

Iowa Code § 708.8 makes it a class D felony to go armed with a dangerous weapon with the intent to use it unlawfully against another person:

A person who goes armed with any dangerous weapon with the intent to use without justification such weapon against the person of another commits a class "D" felony. The intent required for a violation of this section shall not be inferred from the mere carrying or concealment of any dangerous weapon itself, including the carrying of a loaded firearm, whether in a vehicle or on or about a person's body.

The statute is explicit that carrying or concealing the weapon, by itself, is not evidence of the required intent. The state must show something more, such as a threat, a specific plan, or conduct pointing to an intent to use the weapon unlawfully against a person.

A related but separate offense, Iowa Code § 724.4, applies when a person who goes armed with a dangerous weapon actually uses it in the commission of a crime. That is an aggravated misdemeanor, a lesser classification than § 708.8's class D felony, and does not require proof of the specific unlawful-use intent that § 708.8 does; it instead requires the weapon's actual use in committing some other crime.

Minors: a stricter, no-intent-required standard

Iowa Code § 724.4E(1) removes the intent element for minors:

A minor who goes armed with a dangerous weapon concealed on or about the person commits a serious misdemeanor.

Unlike § 708.8's adult standard, this offense does not require the state to prove any intent to use the weapon unlawfully. A minor who conceals a dagger, razor, stiletto, switchblade, or knife with a blade over five inches on or about the person commits a serious misdemeanor by that concealment alone.

Ballistic knives are banned outright

Iowa Code § 724.1(1)(d) lists a ballistic knife among the state's banned "offensive weapons":

A ballistic knife. A ballistic knife is a knife with a detachable blade which is propelled by a spring-operated mechanism, elastic material, or compressed gas.

This is a possession ban independent of intent or use, unlike the ordinary dangerous-weapon statutes above.

School grounds

Iowa Code § 724.4B makes it a class D felony to go armed with, carry, or transport "a firearm of any kind," whether concealed or not, on the grounds of a public or nonpublic school. By its own text, this statute is written for firearms only, and Iowa has no separate statute banning knife possession specifically on school grounds. A knife brought onto school grounds with the intent to use it unlawfully against another person could still fall under § 708.8's general going-armed-with-intent felony, which is not school-specific.

A related statute, Iowa Code § 724.4A, creates a "weapons free zone" within 1,000 feet of a school, or on the real property of a public park, and doubles the maximum fine for a public offense committed there "involving a firearm or offensive weapon." An ordinary knife falls outside this enhanced-penalty zone, but a ballistic knife, banned outright as an "offensive weapon" under § 724.1(1)(d) above, falls inside it.

Jails and correctional facilities

Iowa Code § 719.7 makes it a crime to knowingly introduce, convey, make, obtain, or possess "contraband" in a secure juvenile facility, detention facility, jail, community-based correctional facility, or correctional institution. The statute's definition of contraband includes "a dangerous weapon, offensive weapon, pneumatic gun, stun gun, firearm ammunition, knife of any length or any other cutting device," a broader standard than § 702.7's general dangerous-weapon definition, reaching a knife of any length in this specific setting. Violation involving this category of contraband is a class C felony.

Does Iowa preempt local knife ordinances?

Yes. Iowa Code § 724.28, "Prohibition of regulation by political subdivisions," reaches knives through a general "other weapons" clause rather than a knife-specific one. Subsection 2 provides:

A political subdivision of the state shall not enact an ordinance, motion, resolution, policy, or amendment regulating the ownership, possession, carrying, legal transfer, lawful transportation, modification, registration, or licensing of firearms, firearms attachments, or other weapons when the ownership, possession, carrying, transfer, transportation, or modification is otherwise lawful under the laws of this state. An ordinance regulating firearms, firearms attachments, or other weapons in violation of this section existing on or after April 5, 1990, is void.

Section 724.28 never uses the word "knife," but a knife that is a "dangerous weapon" under § 702.7, discussed above, falls within "other weapons," so a city, county, or township cannot regulate the ownership, possession, or carrying of an otherwise-lawful knife. Subsection 3 lets a person harmed by a violating ordinance sue for declaratory and injunctive relief, statutory damages, and attorney fees. Two limits apply: subsection 4 lets a political subdivision restrict carrying "firearms or other dangerous weapons" inside a building it controls, if it screens entrants for weapons and staffs the building with armed security; and subsection 5 separately voids local ordinances regulating weapon or ammunition storage.

Federal law: what it does and does not reach

Federal law does not ban an individual from owning or carrying a switchblade. The Federal Switchblade Act, 15 U.S.C. §§ 1241 to 1245, instead regulates interstate commerce in switchblade knives, barring their manufacture, sale, transport, or introduction into interstate commerce, and, in 15 U.S.C. § 1245, makes it a federal offense to knowingly possess, manufacture, sell, or import a ballistic knife in or affecting interstate commerce or within federal territorial jurisdiction. 15 U.S.C. § 1244 is captioned "Exceptions" and provides that the chapter "shall not apply to" the knives it lists, exempting them from the Act's prohibitions in 15 U.S.C. §§ 1242-1243 rather than changing the switchblade definition in 15 U.S.C. § 1241(b). Since a 2009 amendment, that exemption in § 1244(5) has covered any knife with a spring, detent, or other closure-bias mechanism that requires hand, wrist, or arm exertion to overcome the bias and assist opening, the carve-out that keeps modern assisted-opening folding knives legal in interstate commerce. A separate exception, § 1244(4), lets a person with only one arm possess and carry a switchblade with a blade three inches or less. None of this changes what Iowa allows for ordinary carry; Iowa's own intent-based statutes above govern that question within the state.

Disclaimer: This article provides general legal information about Iowa's knife laws as of September 2026. It is not legal advice. Consult a lawyer licensed in Iowa for advice about a specific situation. Whether conduct rises to the level of "intent to use" a weapon unlawfully under Iowa Code 708.8 depends heavily on the specific facts.

For a state-by-state comparison, see knife laws by state. Iowa's self-defense statutes are covered separately on the Iowa self-defense laws page.

Statutes cited reflect their in-force version as of 2026-09-18. Last updated: 2026-09-18.

Frequently Asked Questions

Is it legal to carry a knife in Iowa?

Yes, carrying a knife that meets Iowa's dangerous-weapon definition, openly or concealed, is not by itself a crime under Iowa Code 724.5. It becomes a class D felony under Iowa Code 708.8 only if carried with intent to use it unlawfully against another person, which cannot be inferred from carrying or concealment alone.

What is the legal knife blade length in Iowa?

Iowa Code 702.7 treats any knife with a blade exceeding five inches as a statutory dangerous weapon, regardless of type. A dagger, razor, stiletto, or switchblade knife is named specifically and reached regardless of blade length.

Are switchblades legal in Iowa?

A switchblade knife is named in Iowa's dangerous-weapon definition (Iowa Code 702.7), but owning or carrying one is not itself a crime. It becomes criminal only if carried with intent to use it unlawfully against another person, or possessed by a minor while concealed.

Can a minor carry a knife in Iowa?

A minor who goes armed with a dangerous weapon, including a dagger, razor, stiletto, switchblade, or knife with a blade over five inches, concealed on or about the person, commits a serious misdemeanor under Iowa Code 724.4E(1), with no intent-to-use requirement.

Does Iowa preempt local knife ordinances?

Yes. Iowa Code 724.28(2) bars a city, county, or township from regulating the ownership, possession, or carrying of firearms, firearms attachments, or other weapons that are otherwise lawful under state law; the section never uses the word 'knife,' but a knife that is a dangerous weapon under Iowa Code 702.7 falls within that 'other weapons' language, so the section reaches knives even though it does not name them. A political subdivision may still restrict carry inside a building it screens and staffs with armed security.