Can I carry concealed without a permit in Colorado? NO (it’s a Class 2 misdemeanor if caught, and you will most likely forfeit the weapon; however, if done on school property it’s a felony)
18-12-105. Unlawfully carrying a concealed weapon - unlawful possession of weapons.
(1) A person commits a class 2 misdemeanor if such person knowingly and unlawfully:
(a) Carries a knife concealed on or about his or her person; or
(b) Carries a firearm concealed on or about his or her person;
18-12-105.5. Unlawfully carrying a weapon - unlawful possession of weapons - school, college, or university grounds.
(1) A person commits a class 6 felony if such person carries a deadly weapon in or on the real estate and all improvements erected thereon of any public or private elementary, middle, junior high, high, or vocational school or any public or private college, university, or seminary