I have a CCW permit so I am off the hook but I remember the laws are kind of fucked up.
I think 'peacable journey' laws protect you just passing through but they might mess with you anyway and they could make it a real PITA until it got sorted out (if it ever did).
I had a link...I will look for it.
ETA: Most of Colorado you can have the pistol in your car but I think it has to be out of sight or something. Handguns can have one in the chamber, longarms cannot if I remember right.
Denver (as you appear to be aware) is a special case though.
Additional edit:
Colorado:
linkerooDate updated: Aug 27, 2005 @ 2:19 pm
18-12-204. Permit Contents - Validity - Carrying Requirements.
(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.
Denver Municipal Code:
linkerooSec. 39-9. Firearms and weapons prohibited.
(a) It shall be unlawful for any person, other than authorized personnel, to possess, display, flourish, or discharge any firearm within any park, parkway, mountain park or other recreational facility.
(b) It shall be unlawful for any person, other than authorized personnel, to possess, display, or flourish any weapon within any park, parkway, mountain park or other recreational facility. A "weapon" shall be defined as any item listed in section 38-117(a) of the Revised Municipal Code.
(c) It shall not be an offense under subsection (a) of this section to possess a firearm within any park, parkway, mountain park, or other recreational facility if:
(1) The weapon involved was a handgun and the person holds a valid permit or a temporary emergency permit to carry a concealed handgun issued pursuant to state law and is otherwise carrying the handgun in conformance with any applicable state or local law; or
(2) The person is carrying the weapon within a private automobile or other private means of conveyance for hunting or for lawful protection of such person's or another person's person or property, and the person is otherwise lawfully in possession of the weapon. If the weapon is a firearm being transported for hunting, it shall be unloaded while being carried within the private automobile or other private means of conveyance.
(Ord. No. 1041-96, § 1, 12-2-96; Ord. No. 38-07, § 7, 1-22-07)
More Municipal Code:
linkerooSec. 38-117. Dangerous or deadly weapons--Prohibitions.
(a) It shall be unlawful for any person, except a law enforcement officer in the performance of duty, to wear under their clothes, or concealed about their person any dangerous or deadly weapon, including, but not by way of limitation, any pistol, revolver, rifle, shotgun, machine gun, air gun, gas operated gun, spring gun, sling shot, blackjack, nunchaku, brass knuckles or artificial knuckles of any substance whatsoever, or any switchblade knife, gravity knife, or any knife having a blade greater than three and one-half (3 1/2) inches in length, or any explosive device, incendiary device or bomb, or other dangerous or deadly weapon.
(b) It shall be unlawful for any person, except a law enforcement officer in the performance of duty, to carry, use or wear any dangerous or deadly weapon, including, but not by way of limitation, any pistol, revolver, rifle, shotgun, machine gun, air gun, gas operated gun, spring gun, sling shot, blackjack, nunchaku, brass knuckles or artificial knuckles of any substance whatsoever, or switchblade knife, gravity knife, or any knife having a blade greater than three and one-half (3 1/2) inches in length, or anyexplosive device, incendiary device or bomb, or any other dangerous or deadly weapon.
(c) It shall be unlawful for any person, except a law enforcement officer in the performance of duty, to display in a threatening manner, or to flourish any dangerous or deadly weapon, including, but not by way of limitation, any pistol, revolver, rifle, shotgun, machine gun, air gun, gas operated gun, spring gun, sling shot, blackjack, nunchaku, brass knuckles or artificial knuckles of any substance whatsoever, or any switchblade knife, gravity knife, or any knife having a blade greater than three and one-half(3 1/2) inches in length, or any explosive device, incendiary device or bomb, or other dangerous or deadly weapon.
(d) In addition to any other penalty imposed by lawful authority, every person convicted of any violation of this section may be required to forfeit to the city such dangerous or deadly weapon so concealed or displayed.
(e) Nothing in this section shall be construed to forbid any peace officer as defined by law from carrying, wearing or using such weapons as shall be necessary in the proper discharge of the officer's duties.
(f) It shall not be an offense under 38-117(a) or 38-117(b) if:
(1) The person, at the time of carrying the concealed weapon, holds a valid written permit to carry a concealed weapon issued pursuant to section 18-12-105.1, C.R.S., prior to its repeal, or, if the weapon involved was a handgun, holds a valid permit or a temporary emergency permit to carry a concealed handgun issued pursuant to state law and is otherwise carrying the handgun in conformance with any applicable state or local law; or
(2) The person is carrying the weapon concealed within a private automobile or other private means of conveyance, for hunting or for lawful protection of such person's or another person's person or property, while travelling, and the weapon is not an explosive device, incendiary device, or a bomb. If the weapon is a firearm being transported for hunting, it shall be unloaded while being carried within the private automobile or other private means of conveyance.
(g) Any sentence imposed for violation of subsection (a) shall run consecutively and not concurrently with any sentence for any other offense, if the weapon involved was a pistol, revolver, rifle, shotgun, machine gun, air gun, gas operated gun, spring gun, explosive device, or incendiary device or bomb.
(h) Persons convicted of violating and persons pleading guilty or nolo contendere to violation of subsection (a) shall, in addition to any sentence of jail time, pay a fine of at least the following amount when the weapon involved was a pistol, revolver, rifle, shotgun, machine gun, air gun, gas operated gun, spring gun,explosive device, or incendiary device or bomb:
TABLE INSET:
First offense $500.00
Second offense within 5 years 750.00
Third and subsequent offenses 999.00
(Code 1950, § 845.1; Ord. No. 621-86, § 1, 9-22-86; Ord. No. 758-91, § 1, 10-21-91; Ord. No. 434-94, § 1, 6-27-94; Ord. No. 538-00, § 1, 7-3-00; Ord. No. 469-04, § 1, 7-12-04; Ord. No. 38-07, § 1, 1-22-07)
State law references: Unlawfully carrying a concealed weapon, C.R.S. 1973, 18-12-105.