Open carry is legal in colorado but each municipality has its own rules. It can literally be legal in one side of the street and not the other. If you do not know the rules VERY well it is best not to
I can walk in a bank here wearing a mask and open carrying and no one gets excited. But I go into the local gas and water office to pay my water bill and officer on duty in the office gets excited when he sees my empty holster and want to know if I have a knife. It appears LEOs getting a little jumpy.