You can open carry unless there is a law that specifically prohibits you from open carrying, you dont need your ccw permit. or if you city/municipality has laws banning it. I think Breckenridge, Boulder, and Denver ban open carry. But if you open carry you can get charged with things like criminal trespassing, menacing, harassment, ect. (thats what i heard over at RMGO).

Feel free to correct me if im wrong.