Colo. Rev. Stat. § 1-4-805
Any person who desires to be a candidate for a municipal office in a coordinated election shall, in lieu of the requirements of this article, comply with the nominating petition procedure set forth in the "Colorado Municipal Election Code of 1965", article 10 of title 31, C.R.S.; except that part 11 of this article, concerning write-in candidate affidavits, shall apply in such municipal elections, and any nominating petition may be circulated and signed beginning on the ninety-first day prior to the election and shall be filed with the municipal clerk no later than the seventy-first day prior to the date of the election. The petition may be amended to correct or replace signatures that the clerk finds are not in apparent conformity with the requirements of the municipal election code at any time before the sixty-seventh day before the election.
C.R.S. § 1-4-805