Pennsylvania knife law changed in an important way in 2022, but many online summaries still repeat the older rule. The state no longer lists automatic-opening knives as prohibited “offensive weapons.” Carry, location, purpose, and local ordinances still matter.
Most common folding knives, fixed blades, and automatic knives are not prohibited by Pennsylvania state law simply because of their design or blade length. Important restrictions still apply to criminal use or intent, K–12 school property, court facilities, and local rules such as Philadelphia’s public-place knife ordinances.
Are automatic knives legal in Pennsylvania?
Yes, at the state level. Act 119 of 2022 amended 18 Pa.C.S. § 908 and removed automatic knives from the definition of “offensive weapons.” The amendment took effect 60 days after it was approved on November 3, 2022. [1]
The current section 908 definition still covers items such as bombs, grenades, machine guns, sawed-off shotguns, blackjacks, metal knuckles, and other implements for inflicting serious bodily injury that serve no common lawful purpose. It no longer specifically lists a knife whose blade opens automatically. [2]
This change means an ordinary switchblade or out-the-front automatic knife is not prohibited statewide merely because it opens automatically. It does not override school, courthouse, private-property, federal, or local restrictions.
Is there a statewide blade-length limit?
Pennsylvania’s general criminal statutes do not set one statewide maximum blade length for an ordinary knife. A short blade is not automatically lawful everywhere, and a long blade is not automatically unlawful everywhere.
The legal analysis can depend on whether the item has a common lawful purpose, how it is carried, the surrounding circumstances, the location, and any applicable local ordinance. Marketing labels such as “EDC,” “tactical,” or “hunting” do not decide the legal result.
Can you carry a knife openly or concealed?
Pennsylvania does not have a general knife-license system or a statewide rule that bans the concealed carry of every ordinary knife. Section 907 instead prohibits possessing an instrument of crime with intent to employ it criminally. It also covers a concealed weapon possessed with intent to employ it criminally. [3]
That makes purpose and circumstances important, but “lawful purpose” is not a magic phrase that cancels every other restriction. A knife may still create exposure if it is used or carried as a weapon, falls within section 908’s remaining offensive-weapon definition, or is taken into a restricted location.
Practical takeaway: carry a knife as a restrained working tool, avoid threatening display or statements, and check the law for the exact municipality and destination.
How should a knife be transported in a vehicle?
Pennsylvania does not impose a general knife-specific rule requiring every ordinary knife to be locked in a trunk. Vehicle storage can still affect whether an item is considered concealed or readily available and can matter when the surrounding circumstances are evaluated.
For lower-risk transport, keep the knife closed or sheathed, secured against movement, and associated with a lawful activity. Do not rely on the federal Firearm Owners Protection Act as a general knife-transport rule; its interstate safe-passage provision concerns firearms.
What restrictions apply at schools?
Section 912 uses a broad school-specific definition of “weapon” that expressly includes any knife, cutting instrument, and cutting tool. It applies in the buildings and on the grounds of covered public, private, and parochial elementary and secondary schools, and in transportation to or from those schools. [4]
The statute provides a defense when the item is possessed and used in connection with a lawful supervised school activity or course, or is possessed for another lawful purpose. That defense is fact-dependent and should not be treated as advance permission to bring an everyday knife onto K–12 school property.
Section 912 is written for elementary and secondary schools. Colleges and universities may have separate campus policies and other laws may apply, so check the institution’s current rules directly.
What restrictions apply at courthouses?
Section 913 prohibits knowingly possessing a firearm or other dangerous weapon in a court facility. Its definition of “dangerous weapon” specifically includes a dagger and a knife whose blade is exposed automatically by a switch, push-button, spring mechanism, or otherwise. [5]
Covered court facilities must post notice, and counties must provide facilities for checking certain firearms or other dangerous weapons. Do not assume that the 2022 change to section 908 made an automatic knife acceptable in a courthouse; section 913 retains its own definition.
Do local Pennsylvania knife ordinances matter?
Yes. Pennsylvania has not enacted a broad knife-specific preemption rule comparable to those in some other states. Local ordinances can therefore be materially more restrictive.
Philadelphia is the clearest example. Philadelphia Code § 10-820 generally prohibits possessing a “cutting weapon” on public streets or public property, subject to a limited definition and exceptions. Section 10-810 separately prohibits selling, offering for sale, or carrying a spring-released switchblade in the city. [6] [7]
These local provisions illustrate why the statewide legalization of automatic knives does not create one uniform carry rule across Pennsylvania. Check the current municipal code where you plan to carry, especially in Philadelphia.
Are there general age restrictions?
The statewide sections reviewed for this update do not establish one universal minimum age for owning every ordinary knife. Age can still matter under school rules, retailer policies, shipping requirements, supervision rules, and local ordinances. A minor or parent should verify the exact transaction, knife, and location rather than relying on a single statewide age statement.
What federal and private-property rules still apply?
Federal property, secured airport areas, and air travel follow federal rules independently of Pennsylvania law. The Transportation Security Administration prohibits knives in carry-on baggage except for plastic or round-bladed butter knives; checked-baggage and airline requirements still apply. [8]
Employers, event operators, schools, universities, and private property owners may also impose access or conduct policies. A knife can be lawful under criminal law and still violate a workplace or venue rule.
What should you verify before carrying?
- The opening mechanism, blade design, and whether the item has a common lawful purpose.
- Whether the carry method and surrounding circumstances could suggest criminal use.
- Whether the destination is a K–12 school, courthouse, federal facility, secured airport area, workplace, or private venue.
- The current municipal code, especially in Philadelphia.
- Whether a later amendment or court decision changes the interpretation.
Conclusion
Pennsylvania now permits ordinary automatic knives at the state level and imposes no general statewide blade-length limit. That does not make carry unrestricted. Criminal purpose, schools, court facilities, private rules, federal law, and local ordinances can all change the result.
Last reviewed: August 24, 2026.
This article provides general information, not legal advice. Knife laws and their interpretation can change and may depend on knife design, age, carry method, location, purpose, and local rules. Verify current law through official sources or consult a qualified Pennsylvania attorney about a specific situation.
Sources & References
- [1] Pennsylvania General Assembly — House Bill 1929 / Act 119 of 2022. Legislative history for the amendment removing automatic knives from section 908’s offensive-weapon definition.
- [2] Pennsylvania General Assembly — 18 Pa.C.S. § 908. Current prohibited-offensive-weapons statute and definition.
- [3] Pennsylvania General Assembly — 18 Pa.C.S. § 907. Possessing instruments of crime and concealed weapons with criminal intent.
- [4] Pennsylvania General Assembly — 18 Pa.C.S. § 912. K–12 school-property weapon rule, broad knife definition, and statutory defense.
- [5] Pennsylvania General Assembly — 18 Pa.C.S. § 913. Court-facility restrictions and the court-specific dangerous-weapon definition.
- [6] Philadelphia Code — § 10-820, Cutting Weapons in Public Places. Local public-street and public-property rule.
- [7] Philadelphia Code — § 10-810(5), Switchblade Knives. Local sale and carry restriction for spring-released knives.
- [8] Transportation Security Administration — Knives. Federal carry-on and checked-baggage guidance.
