Colo. Rev. Stat. § 1-13.5-205
At such time as may be set by the designated election official, but at least one day prior to the election, one of the election judges from each precinct may appear in person at the office of the designated election official for the purpose of receiving the registration list and, as applicable, property owners list, election supplies, or the designated election official may deliver the same to one of the judges. The judges shall have custody of the registration list and property owners list and shall give his or her receipt for the list. After the closing of the polls on the day of election, the election judge selected pursuant to section 1-13.5-410 to deliver the election papers and supplies shall deliver the registration list and property owners list to the office of the designated election official or to such other place as the designated election official may designate as the counting center.
C.R.S. § 1-13.5-205