Colorado knife laws balance personal rights with public safety, primarily governed by state statutes like C.R.S. § 18-12-101 and § 18-12-105. Open carry of most knives is generally permitted, while concealed carry faces blade length restrictions.
Knife Definitions
Colorado defines a “knife” under C.R.S. § 18-12-101(1)(f) as any dagger, dirk, knife, or stiletto with a blade over 3.5 inches, or other dangerous cutting instrument, excluding hunting or fishing knives used for sports. Ballistic knives, which propel blades via spring or explosive, remain illegal statewide. Switchblades became legal to own and openly carry since 2017 via SB 17-008, removing them from prohibited weapons.
Open Carry Rules
Open carry of legal knives, including fixed-blade, folding, and switchblades of any blade length, is allowed across most of Colorado. Hunting and fishing knives qualify regardless of size when used for sporting purposes, serving as an affirmative defense. However, local ordinances vary: Denver, Aurora, Boulder, and Lakewood prohibit open carry of blades over 3.5 inches.
Concealed Carry Limits
Concealed carry of knives with blades over 3.5 inches is illegal without a permit under C.R.S. § 18-12-105, classified as a class 2 misdemeanor. Blades 3.5 inches or shorter can be concealed freely, with exceptions for private property, vehicles, or business places. Permits are rare for knives alone but may apply via concealed carry weapon licenses.
Prohibited Locations
Knives are banned on all school grounds (pre-K to college) under C.R.S. § 18-12-105.5, a class 6 felony punishable by up to 18 months in prison. Government buildings like courthouses often prohibit them too. Self-defense use follows general laws but requires proving imminent threat; knives must align with intended lawful purpose.
Penalties Overview
Violating concealed carry rules incurs class 2 misdemeanor penalties: up to 12 months jail and $1,000 fine. School possession escalates to class 6 felony: 1-18 months prison, $1,000-$100,000 fines. Ballistic knives carry class 5 felony charges. Local violations, like Denver switchblade possession, add fines up to $999 on repeat offenses.
Practical Tips
Always measure blades from tip to handle base. Research city-specific rules before travel, as state preemption is limited. For self-defense, prioritize de-escalation; knives risk escalation charges if misused. Consult local law enforcement or attorneys for personalized advice, especially amid 2026 updates.
SOURCES:
- https://www.shouselaw.com/co/defense/gun-laws/concealed-carry/
- https://www.battlbox.com/blogs/carry-laws/can-you-open-carry-a-knife-in-colorado
