Colo. Rev. Stat. § 1-5-406
The designated election official shall provide printed ballots for every election. The official ballots shall be printed and in the possession of the designated election official at least thirty days before the election. Every ballot shall contain the names of all duly nominated candidates for offices to be voted for at that election, except those who have died or withdrawn, and the ballot shall contain no other names. The arrangement of the names shall be established by lot at any time prior to the certification of the ballot. The designated election official shall notify the candidates of the time and place of the lot-drawing for the ballot. The drawing shall be performed by the designated election official or a designee. The names shall be printed on the ballot without political party designation.
C.R.S. § 1-5-406