17 August 2023: The Republican Party opted out the state run 5 March Primary and decided to hold a caucus on that date. Govornor Cox approves Utah GOP opting out of presidential primary. 10 August 2023 party letter to Lieutenant Governor Deidre Henderson.

As set by the Republican Party, only voters affiliated with the Republican Party may vote in its presidential caucuses. Apparently, there are provisions for voter who cannot attend in person and deployed military there would be an online portal.

Tuesday 5 March 2024: Utah Precinct Caucuses. Hours 7:00a-9:00p MST (1400-0400 UTC). Delegate Selection: Winner-Take-Most Caucus/Convention. Voter Eligibility: Closed Caucus/Convention.

Precinct Caucuses (preliminary)
Included in Nationwide vote.
Estimate updated 6 March 2024.

All 40 delegates to the Republican National Convention are bound to presidential contenders based on the voting in today's Presidential Caucuses.

• 40 at-large National Convention delegates (including the 3 party leaders: the National Committeeman, the National Committeewoman, and the chairman of the Utah's Republican Party) are bound to presidential contenders according to the statewide vote. [Utah Republican Party Bylaws. 7.0. B.]
• If a candidate receives a majority of the vote (more than 50%), that candidate is allocated all 40 National Convention delegates.
• If 3 or more candidates receive 15% or more of the vote, the 40 National Convention delegates are proportionally allocated to those Presidential contenders receiving 15% or more of the vote. See the rounding rules below.
• If fewer than 3 candidates receive 15% or more of the vote, the 40 National Convention delegates are proportionally allocated between all Presidential contenders. See the rounding rules below.
• Proportional allocation rounding: Beginning with the candidate who received the most votes, multiply [the percentage of votes received] by [40 National Convention Delegates] and round any remainder up to the next whole number. Repeat for the next highest vote getter until all 40 delegates are allocated.

Precinct Caucuses (preliminary)
Estimate updated 6 March 2024.

Statewide: Winner-take-all for Trump.

In addition, the Precinct Caucuses elect approximately 4,000 delegates to the County and State Conventions.

Saturday 27 April 2024: The Utah State Republican Convention convenes.

The State Convention chooses National Convention delegates bound according to the precinct caucus preference vote. Those chosen as National Convention delegates must have participated in the precinct caucus.

The Nominating Convention selects a National Committeeman, a National Committeewoman, and the National Convention Delegates (3 from each of the state's 4 Congressional Districts plus 25 at-large). [Utah Republican Party Bylaws 7.5.A.]

The national delegation shall be bound on the first ballot ... the delegation shall not be allocated nor bound on any subsequent ballots. ... If a candidate who was allocated delegates is not a candidate at the national convention ... then all the delegates shall be re-allocated and bound to the remaining candidates. [Utah Republican Party Bylaws 7.0.B]