Colo. Rev. Stat. § 31-2-109
When any municipality incorporates under the provisions of this title or any municipality reorganizes under the provisions of part 3 of this article after the time for making the annual assessment for taxation has passed, the governing body of each such city or town may provide, by ordinance or resolution, for the assessment of taxable property within the corporate limits of said city or town. When such assessment is made and approved by the governing body, it may proceed to levy the necessary taxes for the fiscal year, which levy shall be certified by the clerk of such city or town to the county assessor, who shall extend the same upon the tax list of the current year, as required by section 31-20-104. The county treasurer shall proceed in the collection of such taxes in all respects as provided by law for the collection of taxes in cities and towns. It is not necessary for any such city or town to pass the annual appropriation ordinance or resolution required by section 29-1-108, C.R.S. This section shall apply only to the assessment and collection of taxes for the first fiscal year after such incorporation or reorganization.
C.R.S. § 31-2-109
This section is similar to former § 31-4-109 as it existed prior to 1975.