No knife is illegal in Kansas based on its design alone. The knives that are illegal in Kansas are the ones you carry with intent to harm someone, or the ones you bring into a place that restricts them, like a federal building, a courthouse with posted rules, or a K-12 school. Switchblades, automatic knives, gravity knives, daggers, dirks, stilettos, and fixed blades of any length are all legal to own and carry, openly or concealed, so long as those two conditions are met.
What Kansas Actually Bans
Kansas law prohibits three impact weapons outright: bludgeons, sand clubs, and metal knuckles. Throwing stars are also prohibited. None of these are knives in the ordinary sense. For every other bladed weapon, the state’s rules turn on your intent or your location, not the blade.
This is a change from the law that existed before 2013. That year, the legislature passed HB 2033 and removed switchblades, automatic knives, and gravity knives from both the criminal use statute (K.S.A. 21-6301) and the criminal carrying statute (K.S.A. 21-6302).1Kansas Legislature. Uniform State Law for Knives – HB 2033 Before that, those knives sat in the same prohibited category as bludgeons. Today they are treated like any other knife.
Knives That Become Illegal With Unlawful Intent
K.S.A. 21-6301 makes it a crime to possess certain weapons “with intent to use the same unlawfully against another.” The listed items include daggers, dirks, dangerous knives, straight-edged razors, stilettos, and similar weapons.2Justia. Kansas Statutes 21-6301 – Criminal Use of Weapons Owning a dagger, keeping a stiletto in a collection, or carrying a dirk on a hunting trip is not a crime. The knife becomes contraband only when prosecutors can prove you had it with the purpose of harming someone.
That proof usually requires something concrete: threatening statements, a documented confrontation, or circumstances that point to an offensive purpose rather than an everyday one. Without that evidence, possession alone is lawful.
The statute uses the term “dangerous knife” without defining it. An older version of the carrying statute excluded ordinary pocket knives with blades of four inches or less from that category, but the legislature removed that language in 2013. The term is now undefined, which gives prosecutors some interpretive room, though the direction of Kansas law has been toward fewer knife restrictions, not more.
Carrying a Knife in Kansas
Kansas sets no maximum blade length and places no general restriction on carrying a knife, openly or concealed. The 2013 amendments pulled daggers, dirks, dangerous knives, straight-edged razors, and stilettos out of the concealed carry prohibition in K.S.A. 21-6302. Before that change, carrying any of those blades under your clothing was a crime regardless of why.
The current version of K.S.A. 21-6302 still prohibits carrying bludgeons, sand clubs, metal knuckles, and throwing stars, and still prohibits concealed carry of billies, blackjacks, slungshots, and “any other dangerous or deadly weapon or instrument of like character.”3Kansas State Legislature. Kansas Statutes 21-6302 – Criminal Carrying of a Weapon That catch-all phrase targets improvised impact weapons rather than ordinary knives. A concealed folding knife, fixed blade, or automatic knife is legal statewide.
Where You Cannot Take a Knife
Location is where most knife trouble happens in Kansas. A few categories of place either restrict knives by their own policy or fall under federal rules.
Federal Buildings
Federal law overrides Kansas law inside any federal facility, including post offices, federal courthouses, and government offices. Under 18 U.S.C. § 930, a pocket knife with a blade shorter than 2½ inches is permitted. A knife with a blade of 2½ inches or longer qualifies as a dangerous weapon and is prohibited. Bringing a prohibited knife into a federal facility can result in a fine, up to one year in prison, or both, and up to five years if prosecutors can show you intended to use it in a crime.4Office of the Law Revision Counsel. 18 U.S. Code 930 – Possession of Firearms and Dangerous Weapons in Federal Facilities
K-12 Schools, Jails, and Juvenile Facilities
Kansas’s statewide preemption law carves out an exception for unified school districts, jails, and juvenile correctional facilities, which can set their own knife policies.5Kansas Legislature. Kansas Code 12-16,134 – Knives and Knife Making Components Virtually all of them ban knives on their premises. There is no blanket state law banning knives at K-12 schools, but each school’s own policy is enforceable, so check it before bringing a knife onto the property.
State Buildings and Courthouses
K.S.A. 21-6309 restricts weapons in the state capitol complex, the governor’s residence, designated state-owned or leased buildings, and county courthouses unless a county resolution authorizes otherwise.6Justia. Kansas Statutes 21-6309 – Unlawful Possession of Firearms on Certain Government Property That statute specifically covers firearms, not knives. There is no state-level law that categorically bans knives in state government buildings or courthouses.
Even so, many of these buildings use security screening and post their own policies restricting weapons broadly. The legal basis is the building’s internal policy or a county resolution rather than K.S.A. 21-6309. A posted sign or a metal detector should be treated as enforceable.
Public University Campuses
Kansas Board of Regents policy restricts certain knives on state university campuses. The policy prohibits straight-blade knives with blades of four inches or longer, including daggers, dirks, and stilettos, as well as switchblade-style knives. Ordinary pocket knives and culinary knives used in food preparation are exempt. Individual universities may add further restrictions, so check your campus rules.
Penalties
Most knife-related offenses in Kansas are Class A nonperson misdemeanors, punishable by up to one year in jail. That applies to both possessing a knife with unlawful intent under K.S.A. 21-6301(a)(2) and criminal carrying of a prohibited weapon under K.S.A. 21-6302.2Justia. Kansas Statutes 21-6301 – Criminal Use of Weapons3Kansas State Legislature. Kansas Statutes 21-6302 – Criminal Carrying of a Weapon A conviction stays on your record and can affect employment, housing, and professional licensing well after any jail time is served. Federal knife charges inside a federal facility carry the separate penalties described above.
Local Ordinances Do Not Add Rules
Kansas has one of the strongest knife preemption statutes in the country. Under K.S.A. 12-16,134, no city or county can pass any ordinance, resolution, regulation, or tax relating to the possession, carry, sale, transfer, or use of knives or knife-making components. Any local knife ordinance that existed before July 1, 2014, is void.5Kansas Legislature. Kansas Code 12-16,134 – Knives and Knife Making Components School districts, jails, and juvenile facilities are the only entities exempt. In any other setting, the state rules are the only ones that apply, and they are the same in every Kansas city.