Literally every jurisdiction in the State, except Denver County/City is fully preempted by Colorado State Law.
Two things happened recently; a Senate Bill regulating the carry of firearms and a Colorado Supreme Court decision on the ability of local municipalities to regulate firearms.
Here's the deal- Many localities have firearms regulations on the books. These are Not new laws. The regulations usually revolve around open carry, brandishing, and sometimes even concealed carry.
The Supreme Court Decision And our Senate Bill, combined with our State Constitution, provide an extremely clear cut answer to your question.
You may open carry Anywhere in Colorado, except Denver- open carry is the Only constitutionally protected way to carry in Colorado.
Localities May ban open carry with properly posted signage. All Jefferson County Open Space parks are marked for no carry of firearms; which means No Open Carry.
Stay safe and carry on!
PS. If you have your CHP and stay out of Denver- you have the ability to carry your pistol in almost Any fashion you see fit. For regardless of the officers interpretation; you will be fully legal. Concealed or Open, you know?