Colorado Constitution pdf. Article XX, Section 6 addresses Home Rule.
https://www.colorado.edu/bfa/sites/d...NSTITUTION.pdf

It has been through the courts often. This may help if you a understand lawyer-speak. I don't understand much lawyer-speak so I have no idea if this is a reliable source of information--
https://legisource.net/2011/11/03/wh...s-in-colorado/

What it says is sometimes Denver laws can over-ride Colorado State laws.