OC is only governed by local laws to the extent that it does not violate CRS 29-11.7-104:
29-11.7-104. Regulation - carrying - posting.A municipalities' wholesale ban on OC would be invalid unless that municipality posted signs at each and every public entrance into the municipalities' jurisdiction, which is logistically impossible.
A local government may enact an ordinance, regulation, or other law that prohibits the open carrying of a firearm in a building or specific area within the local government's jurisdiction. If a local government enacts an ordinance, regulation, or other law that prohibits the open carrying of a firearm in a building or specific area, the local government shall post signs at the public entrances to the building or specific area informing persons that the open carrying of firearms is prohibited in the building or specific area.