As set by the Republican Party, only voters affiliated with the Republican Party may vote in its presidential primary election.

Tuesday 3 March 2020: Utah Primary. Hours reportedly 7:00a-8:00p MST (1400-0300 UTC). Delegate Selection: Winner-Take-Most Primary. Voter Eligibility: Closed Primary.

Primary
Source: State of Utah.
Status: Official. Retrieved: Thursday 9 April 2020.
Included in Nationwide vote.

Roque "Rocky" De La Fuente, Jr. withdrew. His name appears on the ballot but votes for him are not counted.

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

• 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.
• 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.

Primary
Source: State of Utah.
Status: Official. Retrieved: Thursday 9 April 2020.

Statewide: Winner-take-all for Trump.

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

Saturday 25 April 2020: 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]