In Wisconsin, knives are generally legal to own and carry. The main statewide issues are not broad knife-type bans, but restricted places, statewide preemption, and the special concealed-knife rule that applies to people who are prohibited from possessing firearms. Wisconsin also repealed its old switchblade ban, so local myths and outdated summaries can still mislead readers. (Wisconsin Legislature Docs)
Wisconsin is generally knife-friendly, but the legal analysis still depends on location, status, and a few state-specific statutes. (Wisconsin Legislature Docs)
The most important background point is that Wisconsin no longer has its former statewide switchblade prohibition. That changed with 2015 Wisconsin Act 149, which repealed the old switchblade section and also reshaped how concealed-weapon law interacts with knives. Just as important, Wisconsin has a statewide preemption statute that withdraws broad local authority over knife possession, bearing, and transportation, while still leaving room for limited building-based restrictions by political subdivisions. (Wisconsin Legislature Docs)
As a general rule, Wisconsin does not currently impose a broad statewide ban on ordinary knife ownership by knife type. (Wisconsin Legislature Docs)
That means ordinary folding knives, fixed blades, hunting knives, work knives, and similar knives are generally lawful to own under current statewide law. Because the old switchblade ban was repealed, outdated references that still describe switchblades as illegal under Wisconsin state law are no longer current. I also did not verify a current statewide Wisconsin statute that broadly bans butterfly knives, daggers, or double-edged knives simply because of their design. (Wisconsin Legislature Docs)
Yes, open carry of a knife is generally legal in Wisconsin. (Wisconsin Legislature Docs)
The real limitations are place-based, not a general open-carry ban. Open carry does not override restrictions on school premises, university property, or lawful building restrictions imposed by a political subdivision in a building it owns, occupies, or controls. So the practical answer is simple: open carry is generally lawful in ordinary public settings, but not everywhere. (Wisconsin Legislature Docs)
For most non-prohibited adults, Wisconsin does not treat concealed knives the same way it treats concealed weapons under the general concealed-weapon statute. (Wisconsin Legislature Docs)
This is the key statutory point many articles miss. Wisconsin’s concealed-weapon framework includes a separate statute, § 941.231, for carrying a concealed knife. The official statute page states that any person prohibited from possessing a firearm under § 941.29 who goes armed with a concealed knife that is a dangerous weapon is guilty of a Class A misdemeanor. That means Wisconsin does not create a broad rule that all concealed knives are illegal, but it does create a specific risk for prohibited persons carrying a concealed knife that qualifies as a dangerous weapon. (Wisconsin Legislature Docs)
So the safest summary is this: for ordinary adults who are not prohibited persons, Wisconsin is generally permissive on concealed knives; for prohibited persons, concealed carry of a dangerous knife can trigger criminal liability. (Wisconsin Legislature Docs)
Wisconsin’s former statewide switchblade ban was repealed, and I did not verify a current statewide ban on these knife categories as such. (Wisconsin Legislature Docs)
The official act history is important here. 2015 Wisconsin Act 149 expressly repealed § 941.24, the former switchblade statute. That is why older summaries and forum posts can still be wrong even when they sound confident. As of March 2026, the controlling statewide law is the post-repeal framework, not the older ban. (Wisconsin Legislature Docs)
I did not verify a general statewide blade-length limit for ordinary knife carry in Wisconsin. (Wisconsin Legislature Docs)
That does not mean blade length never matters anywhere. Some place-specific rules can define dangerous weapons in a broader or more specific way. For example, Wisconsin State Fair Park’s weapon rule includes its own dangerous-weapon definition, and the rule prohibits carrying, possessing, or using such weapons there without written approval. That is a location-specific rule, not a general statewide blade-length limit for all carry situations. (Wisconsin Legislature Docs)
The most important statewide and quasi-statewide restrictions I verified are K-12 school premises, university property, and some local government buildings. (Wisconsin Legislature Docs)
Wisconsin school-premises law is one of the clearest statewide restrictions. The official statute page for § 948.61 includes a knife-specific exception for legal hunting in a school forest, which confirms that knives are within the statute’s broader dangerous-weapon framework. In ordinary cases, school premises remain a major no-carry area for dangerous weapons, including qualifying knives, unless a statutory exception applies. (Wisconsin Legislature Docs)
University of Wisconsin property is separately regulated. The official administrative code for UWS 18.11 states: “No person may carry, possess or use any dangerous weapon on university lands or in university buildings or facilities” except with written approval or another applicable exception. That makes university property a meaningful restriction even though Wisconsin is otherwise broadly permissive on knife carry. (Wisconsin Legislature Docs)
Wisconsin State Fair Park also has its own rule. The official code provision SFP 2.14 prohibits carrying, possessing, or using dangerous weapons there without written approval of the chief of police or designee, subject to listed exceptions. (Wisconsin Legislature Docs)
Wisconsin does not appear to have a blanket statewide statute banning knives in all public buildings. The official statute page for § 941.235 is firearm-specific: it says a person who goes armed with a firearm in certain state or local government buildings is guilty of an offense. Knife restrictions in local buildings are instead more closely tied to Wisconsin’s preemption statute, which allows a political subdivision to prohibit knives in a building, or part of a building, that it owns, occupies, or controls. (Wisconsin Legislature Docs)
The clearest statewide age-related rule I verified is Wisconsin’s dangerous-weapon restriction for persons under 18. (Wisconsin Legislature Docs)
The official statute page for § 948.60(2)(a) states that any person under 18 years of age who possesses or goes armed with a dangerous weapon is guilty of a Class A misdemeanor, subject to statutory exceptions. Because Wisconsin uses the term dangerous weapon, this is not the same thing as saying every minor is automatically banned from possessing every knife in every setting. (Wisconsin Legislature Docs)
I did not verify a simple statewide statute that broadly bans the sale of all ordinary knives to all minors. For that reason, it is safer and more accurate to say that the main verified statewide youth restriction is minor possession of a dangerous weapon, not a universal knife-sale prohibition. (Wisconsin Legislature Docs)
Yes. Wisconsin has strong statewide knife-law preemption. (Wisconsin Legislature Docs)
The official statute page for § 66.0409 states that the legislature has withdrawn from municipalities authority to legislate on the possession, bearing, or transportation of any knife or firearm, except as allowed by that statute. In practice, this means local governments generally cannot create their own broader knife-carry code that is more restrictive than state law. (Wisconsin Legislature Docs)
Yes, but much less than in states without preemption. (Wisconsin Legislature Docs)
Because of statewide preemption, local governments cannot freely regulate knives across the board. But they still matter in one important way: Wisconsin’s preemption framework allows a political subdivision to restrict knives in a building or part of a building that it owns, occupies, or controls. So readers should still pay attention to courthouse, county-building, and similar posted building rules even in a strong preemption state. (Wisconsin Legislature Docs)
Federal knife law is separate from Wisconsin carry law and still matters in some situations. (U.S. Code)
Under 15 U.S.C. § 1241, a switchblade knife is defined as a knife with a blade that opens automatically by button, device in the handle, or by inertia or gravity. 15 U.S.C. § 1242 generally prohibits introducing, transporting, or distributing switchblades in interstate commerce, and 15 U.S.C. § 1244 provides exceptions. Federal law also separately addresses ballistic knives in 15 U.S.C. § 1245. These are federal rules and should not be confused with Wisconsin’s generally permissive state-law treatment of knife ownership and carry. (U.S. Code)
Wisconsin is generally favorable to knife ownership and carry, but restricted places and prohibited-person status still matter. (Wisconsin Legislature Docs)
| Issue | Wisconsin law |
|---|---|
| Knife ownership | Generally legal statewide. |
| Switchblades / automatics | Former statewide ban repealed in 2015. |
| Butterfly knives | No current statewide ban verified as a knife type. |
| Open carry | Generally lawful. |
| Concealed carry | Generally permissive for non-prohibited persons; prohibited persons face risk under § 941.231 if the concealed knife is a dangerous weapon. |
| Blade length | No general statewide blade-length limit verified in the core statutes reviewed. |
| K-12 schools | Dangerous weapons, including qualifying knives, are generally restricted on school premises unless an exception applies. |
| University property | Restricted by administrative rule. |
| State Fair Park | Restricted by administrative rule. |
| Local ordinances | Broadly preempted, though local governments may regulate knives in buildings they own, occupy, or control. |
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No knife-specific Wisconsin bill has been enacted in 2025–March 2026 that changes the core statewide knife rules discussed above, but there are pending concealed-weapon bills worth watching. (Wisconsin Legislature Docs)
The most relevant current note is 2025 Assembly Bill 609 and its companion 2025 Senate Bill 607. The official Wisconsin Legislature pages describe them as bills relating to the right to carry a weapon in this state and licenses to carry a concealed weapon. The Assembly bill remains listed in A – State Affairs, and the Senate bill is listed in S – Licensing, Regulatory Reform, State and Federal Affairs, which means they are still proposals rather than enacted law as of March 15, 2026. (Wisconsin Legislature Docs)
Based on the official proposal snippets, these bills are broader constitutional carry / concealed-weapon measures and are primarily important to Wisconsin’s firearm framework. Since ordinary knives are already generally lawful for non-prohibited persons under current Wisconsin law, these pending bills do not change the article’s main knife-law conclusions today. They are worth monitoring, but they should not be presented as current law. (Wisconsin Legislature Docs)
Yes. Wisconsin’s former statewide switchblade ban was repealed by 2015 Wisconsin Act 149. Federal switchblade law may still apply in interstate-commerce or federal-jurisdiction situations. (Wisconsin Legislature Docs)
Be careful. Wisconsin’s concealed-knife statute specifically applies to a person prohibited from possessing a firearm who carries a concealed knife that is a dangerous weapon. (Wisconsin Legislature Docs)
I did not verify a general statewide blade-length limit for ordinary carry, but special-place rules can still apply in specific locations. (Wisconsin Legislature Docs)
Generally, school premises are a major restricted place for dangerous weapons, including qualifying knives, unless a statutory exception applies. (Wisconsin Legislature Docs)
Usually not in the broad sense, because Wisconsin has statewide preemption. But local governments may still restrict knives in buildings they own, occupy, or control. (Wisconsin Legislature Docs)
No. As of March 15, 2026, they are still pending proposals, not enacted law. (Wisconsin Legislature Docs)
Laws can change, local building rules may still apply, and restricted places, intent, and prohibited-person status can change the result. This article is legal information, not legal advice. (Wisconsin Legislature Docs)
