"Can I Open Carry in Colorado? YES. But this is not a simple yes; unfortunately, it is quite complicated.
What exactly is Open Carry? There is no statutory definition of open carry. But put simply, it is the carrying of a firearm that is not concealed.
Does it matter if it is loaded or not? SOMETIMES.
In general, it does not change things legally if it is loaded or not. For example, in your car, the law does prohibit long guns with a round chambered, but not handguns..."
stolen from: http://www.rmgo.org/gun-law-faqs/open-carry