You might look to the reply I got from the City Attorney last month about OC and CC in the OSMP around Boulder (which have explicit "No firearms" signage)
I of course responded with article 13 and Students for CC vs. CU board of Regents which held that "In its legislative declaration, the General Assembly makes clear that the CCA is meant to be a statewide comprehensive scheme."Thank you for your email. This is a complex area of Colorado law. Under the Colorado Constitution, home rule cities such as Boulder have an exclusive right to legislate over matters of local concern. The Colorado Supreme Court has never decided whether the regulation of firearms is a matter of statewide or local concern. There was one case involving Denver on which the court split 4 to 4. The attorney general ruled that this meant that the case had no precedential effect. The city of Boulder is unique in that it manages over 45,000 acres of open space. We take very seriously our community’s concerns regarding firearms in these areas. Accordingly, we have adopted and enforced our regulations. As a matter of policy, our rangers do not ticket individuals who carry firearms and possess a state permit.
I hope that this is helpful.
Boulder City Attorney
I know this is all CC stuff, but as far as I can determine Boulder should be an OC city especially if you have a CC permit.
There is some signage around the city council chambers but I can't remember if says "No firearms" or "No Openly displayed Firearms"
Since they seem to have to prohibit it in certain areas this also points towards OC being legal.
Unfortunately, I haven't summoned the personal courage to test this policy and have never OC'd in Boulder. I would love to, but I would appreciate it being part of the OC community. Can we get a Boulder OC event going?