Knives are everyday tools, but in the eyes of the law, they can also be seen as weapons. That’s why it’s important to understand Colorado’s knife laws—especially if you carry one regularly or plan to buy one.
Whether you’re a camper, hiker, chef, or just curious about your rights, this guide will help you understand what’s legal and what’s not when it comes to knives in Colorado.
Are Knives Legal to Carry in Colorado?
Yes, knives are legal to carry in Colorado, but with some important restrictions based on blade length, location, and intent. The laws separate knives into different types and treat them differently depending on how they are used or carried.
Legal Knife Length in Colorado
Colorado law allows you to carry knives with a blade length of 3.5 inches or less concealed, without any special permit. If the blade is longer than 3.5 inches, you can still carry it, but only if it’s carried openly and not hidden.
Carrying a concealed knife over 3.5 inches without proper cause or permit can lead to legal trouble.
Types of Knives Legal in Colorado
In general, the following knives are legal to own and carry (within size limits):
Pocket knives
Hunting knives
Folding knives
Kitchen knives
Utility knives
As long as these are 3.5 inches or under, you can carry them concealed or open without a problem.
Types of Knives That May Be Restricted
Some knives have more rules or may be banned in specific cities:
Switchblades (automatic knives) are legal in Colorado since 2017, but cities like Denver may still ban them locally.
Ballistic knives (knives that shoot blades) are illegal statewide.
Throwing stars or other exotic weapons may also be restricted under local laws.
Can You Carry a Knife in a Vehicle?
Yes, you can carry a knife in your car, but the same length rules apply. If the blade is over 3.5 inches, it should not be hidden within reach (like in your glove box or under the seat) unless you have a lawful reason, such as work or outdoor activity.
Where You Cannot Carry a Knife in Colorado
Even if a knife is legal, there are places where carrying any knife can get you into trouble:
Schools: Knives are banned in public and private school buildings.
Government buildings: Including courthouses and certain city offices.
Airports: Carrying a knife in airport security zones is a federal offense.
Denver: Has stricter rules—concealed carry of any knife with a blade longer than 3.5 inches is illegal, and some knives banned elsewhere might be restricted here.
Can Minors Carry Knives?
Yes, but with limitations. Children under 18 can carry small utility or pocket knives for tools or school-related activities like Scouts, but anything larger or used as a weapon may be considered unlawful, especially on school grounds.
Self-Defense and Knife Use
You can legally use a knife for self-defense under Colorado’s “Make My Day” law, but only in situations where you’re in immediate danger and responding with reasonable force. Using a knife to threaten, scare, or attack someone without clear justification can lead to criminal charges.
Colorado allows residents to own and carry many types of knives, but there are strict rules about blade length, location, and intent. Always keep blades under 3.5 inches if you plan to carry them concealed, and be aware of local city rules, especially in places like Denver.
Respect the places where knives are banned, and always use knives responsibly to stay within the law.
