Colo. Rev. Stat. § 30-28-112
The county planning commission shall certify a copy of the plans for zoning all or any part of the unincorporated territory within the county, or any adopted part or amendment thereof or addition thereto, to the board of county commissioners of the county. After receiving the certification of said zoning plans from the commission and before the adoption of any zoning resolutions, the board of county commissioners shall hold a public hearing thereon, the time and place of which at least fourteen days' notice shall be given by one publication in a newspaper of general circulation in the county. Such notice shall state the place at which the text and maps so certified by the county planning commission may be examined. No substantial change in or departure from the text or map so certified by the county planning commission shall be made unless such change or departure is first submitted to the certifying county planning commission for its approval, disapproval, or suggestions and, if disapproved, shall receive the favorable vote of not less than a majority of the entire membership of the board of county commissioners. The county planning commission shall have thirty days after such submission within which to send its report to the board of county commissioners.
C.R.S. § 30-28-112