How Old Do You Have to Be to Carry a Knife in Michigan?

There is no minimum age to carry a knife in Michigan. No state statute sets an age for possessing, buying, or carrying a knife, and Michigan has no law specifically prohibiting the sale of knives to minors in ordinary consumer settings. That puts Michigan in a different category from states that treat knives the way they treat alcohol or tobacco. What the state does regulate is the type of knife, whether it is concealed, where it is carried, and whether the person carrying it intends to use it unlawfully. Those rules apply the same way to a fourteen-year-old and a forty-year-old.

Why Age Still Matters in Practice

The absence of an age limit does not mean a minor faces no risk from carrying a knife. Three things change the picture.

First, schools. State law creates weapon-free school zones with their own criminal penalties, and schools layer their own discipline on top. A student caught with a knife on school grounds can face suspension or expulsion regardless of what a prosecutor decides to do.

Second, intent scrutiny. Michigan’s core knife statute turns on whether a person carries a weapon intending to use it unlawfully. A young person carrying a knife with no obvious lawful reason gives officers more room to ask questions about purpose, and answers given in that moment can shape a charging decision.

Third, civil exposure for parents. Allowing a minor to carry a knife that later gets used to hurt someone can create civil liability for the adult who permitted it, even if no criminal charge attaches to the minor for mere possession.

The Two Statutes That Actually Govern Knife Carrying

Michigan’s knife rules live in two sections of the Penal Code. Both are felonies, and both apply regardless of age.

Carrying With Unlawful Intent (MCL 750.226)

This statute makes it a felony to carry a dagger, dirk, razor, stiletto, a knife with a blade over three inches, or any other dangerous or deadly weapon if you intend to use it unlawfully against another person.¹ The controlling element is intent. A large fixed-blade knife is not illegal under this section if the person carrying it has no unlawful purpose; prosecutors must prove the intent.

Concealed Carry of Certain Knives (MCL 750.227)

This statute prohibits carrying a dagger, dirk, stiletto, a double-edged nonfolding stabbing instrument of any length, or any other dangerous weapon concealed on the person. It also prohibits carrying those same weapons in any vehicle the person operates or occupies, whether concealed or not.² Intent is not required. Merely having the wrong kind of knife hidden on the body, or sitting in a car, is enough for a felony charge.

The statute recognizes three safe harbors: your own home, your place of business, and other land you possess. A hunting knife “adapted and carried as such” is also exempt, though that carve-out is narrower than many people assume. A hunting knife on a belt heading into the woods is clearly covered; the same knife on a downtown sidewalk on a Saturday night is a much harder argument.

Which Knives Cause Problems

Michigan does not ban many knife types outright. What creates trouble is usually how a knife is carried, not what kind it is. A few categories still deserve attention.

Single-edged folding knives and ordinary pocket knives are the safest category. Carried without unlawful intent, they do not fall into the prohibited types under either statute. Open carry is legal, and concealed carry is typically lawful as long as the knife is not classified as a dangerous weapon.

Double-edged fixed blades are legal to own, but concealed-carry law hits them hardest. MCL 750.227 targets double-edged nonfolding stabbing instruments “of any length,” which means even a short double-edged knife concealed on the person is a felony.²

Switchblades and other automatic-opening knives are legal in Michigan. Public Act 96 of 2017 repealed the old ban, so these knives can be owned, bought, sold, and carried under the same concealed-carry and intent rules that apply to any other knife.³ Gravity knives are legal to own and possess; no separate statute prohibits them.

What Counts as Concealed

Michigan courts use a practical test: a knife is concealed when ordinary people coming into casual contact with the carrier would not notice it. Absolute invisibility is not required. A knife clipped inside a pocket with only the clip showing is a gray area, and whether it counts as concealed is usually a jury question.

Open carry of legal knives is permitted. A sheathed knife worn visibly on the belt is lawful if the knife is not a prohibited type and there is no unlawful intent behind carrying it.

Schools: The Biggest Risk for Minors

The place a minor is most likely to run into a knife charge is school. MCL 750.237a makes it a separate offense to commit any knife violation covered by sections 226 or 227 within a weapon-free school zone, which includes school buildings, playing fields, school-related property, and vehicles used to transport students.⁴ A knife violation in a school zone is a felony carrying up to the same prison term as the underlying offense, plus community service of up to 150 hours and a fine of up to three times the normal maximum.

Even simple possession of a weapon on school property, without any separate knife offense, is a misdemeanor punishable by up to 93 days in jail, 100 hours of community service, and a $2,000 fine.⁴ Exceptions apply for school security personnel, peace officers, and licensed concealed-carry holders, among others, but those categories rarely cover a student. School discipline, including suspension and expulsion, runs on its own track and applies on top of any criminal case.

Local Ordinances Can Be Stricter

Michigan has no knife preemption law. The legislature passed a preemption bill in 2021 that would have overridden all local knife regulations, but Governor Whitmer vetoed it, and no replacement has been enacted since. Cities and municipalities remain free to set knife rules stricter than state law.

Some do. Detroit prohibits possessing cane swords and umbrella swords and bans carrying any knife with a blade over three inches in any public place, whether openly or concealed. Lansing has a similar three-inch blade-length restriction in public. Before carrying a knife in an unfamiliar Michigan city, checking the local ordinance is worth the few minutes it takes.

Penalties

Michigan treats its core knife offenses as felonies, which catches many people off guard.

Carrying with unlawful intent under MCL 750.226 is a felony punishable by up to five years in prison or a fine of up to $2,500.¹
Concealed carry of a prohibited knife under MCL 750.227 is a felony punishable by up to five years in prison or a fine of up to $2,500.²
Simple possession of a weapon on school property is a misdemeanor with up to 93 days in jail and a $2,000 fine; combined with a section 226 or 227 violation, it becomes a felony.⁴

A knife carried or used in violation of the Penal Code is also subject to forfeiture under MCL 750.239, and the Michigan Department of State Police decides how to dispose of it.⁵ A knife lost to a conviction is not coming back.

So the short answer to the age question is that Michigan does not set one. The longer answer is that everything else the state does regulate about knives applies to a teenager exactly the way it applies to an adult, and the school setting adds one more layer that only affects minors in practice. A young person carrying an ordinary folding pocket knife with no unlawful purpose, off school grounds and outside any city with a stricter local rule, is on solid ground. Anything beyond that deserves a closer look at the specific knife, the specific place, and the specific reason for carrying it.

1
Michigan Legislature. Michigan Compiled Laws Section 750.226
2
Michigan Legislature. Michigan Compiled Laws Section 750.227
3
Michigan Legislature. Senate Bill 245 Analysis as Enacted
4
Michigan Legislature. Michigan Compiled Laws Section 750.237a
5
Michigan Legislature. Michigan Compiled Laws Section 750.239