Utah Code Title 20A. Election Code § 20A-2-107.5. Designating or changing party affiliation--Regular primary election and presidential primary election--Voting in primaries of multiple parties prohibited

(a) affiliate with a political party by completing a change of party affiliation form or voter registration form and submitting the form to the county clerk or a poll worker; and

(b) vote in that party's primary election.

(4)(a) A voter who votes in the presidential primary election of a registered political party may not, for the same election, vote in the presidential primary election of another registered political party.

(b) A voter who votes in the regular primary election of a registered political party may not, for the same election, vote in the regular primary election of another registered political party.