Can I carry concealed on my person 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

 

Can I carry concealed in my vehicle without a permit (even in Denver)? YES

See C.R.S. 18-12-204

(3) (a) A person who may lawfully possess a handgun may carry a handgun under the following circumstances without obtaining a permit and the handgun shall not be considered concealed:

(I) The handgun is in the possession of a person who is in a private automobile or in some other private means of conveyance and who carries the handgun for a legal use, including self-defense; or

(II) The handgun is in the possession of a person who is legally engaged in hunting activities within the state.

(b) The provisions of this subsection (3) shall not be construed to authorize the carrying of a handgun in violation of the provisions of section 18-12-105 or 18-12-105.5.

 

Can I carry a concealed weapon while hunting but without a permit? YES.

See C.R.S. 18-12-204

(3) (a) A person who may lawfully possess a handgun may carry a handgun under the following circumstances without obtaining a permit and the handgun shall not be considered concealed:

(I) The handgun is in the possession of a person who is in a private automobile or in some other private means of conveyance and who carries the handgun for a legal use, including self-defense; or

(II) The handgun is in the possession of a person who is legally engaged in hunting activities within the state.

 

Can I carry a loaded rifle or shotgun in my vehicle? YES, in most cases.  However, it may not be chambered.

33-6-125  Possession of a loaded firearm in a motor vehicle.

It is unlawful for any person, except a person authorized by law or by the division, to possess or have under his control any firearm, other than a pistol or revolver, in or on any motor vehicle unless the chamber of such firearm is unloaded. Any person in possession or in control of a rifle or shotgun in a motor vehicle shall allow any peace officer, as defined in section 33-1-102 (32), who is empowered and acting under the authority granted in section 33-6-101 to enforce articles 1 to 6 of this title to inspect the chamber of any rifle or shotgun in the motor vehicle. For the purposes of this section, a "muzzle-loader" shall be considered unloaded if it is not primed, and, for such purpose, "primed" means having a percussion cap on the nipple or flint in the striker and powder in the flash pan. Any person who violates this section is guilty of a misdemeanor and, upon conviction thereof, shall be punished by a fine of fifty dollars and an assessment of fifteen license suspension points.