Colo. Rev. Stat. § 30-15-405
All ordinances, as soon as may be after their adoption, shall be recorded in a book kept for that purpose and shall be authenticated by the signatures of the chairman of the board of county commissioners and the county clerk and recorder. All ordinances of a general or permanent nature and those imposing any fine, penalty, or forfeiture, following adoption, shall be published by title only and shall contain the date of the initial publication and shall reprint in full any section, subsection, or paragraph of the ordinance which was amended following the initial publication. Publication following adoption may be in full at the discretion of the board of county commissioners. It is a sufficient defense to any suit or prosecution for such fine, penalty, or forfeiture to show that no publication was made. If there is no newspaper published or having a general circulation within the limits of the county, then, upon a resolution being passed by the board of county commissioners to that effect, ordinances may be published by posting copies thereof in three public places within the limits of the county, to be designated by the board of county commissioners. Except for ordinances calling for special elections or necessary to the immediate preservation of the public health or safety and containing the reasons making the same necessary in a separate section, such ordinances shall not take effect and be in force before thirty days after they have been so published. The excepted ordinances shall take effect upon adoption. A copy of an appropriate section or sections of the book of ordinances provided for in this section, certified as correct by the county clerk and recorder, shall be taken and considered in all courts of this state as prima facie evidence that such ordinances have been published as provided by law.
C.R.S. § 30-15-405