Colo. Rev. Stat. § 1-13.5-1205
(1) If the challenge is not withdrawn after the person offering to vote has answered the questions asked pursuant to section 1-13.5-1204, one of the election judges shall tender the following oath:
You do solemnly swear or affirm that you are a citizen of the United States of the age of eighteen years or over; that you have been a resident of this local government and have not retained a home or domicile elsewhere, or that you or your spouse or civil union partner are owners of taxable real or personal property within the local government; that you are a registered elector of this state; and that you have not previously voted at this election.
Source: L. 2014: Entire article added, (HB 14-1164), ch. 2, p. 50, § 6, effective February 18.