This Presidential Primary coincides with a state/local primary. These coinciding primaries tend to have an impact upon voter turnout.

Voter registration ends 30 days before the Primary and voters affiliate with the Republican Party by either voting in the Republican Primary or signing an affidavit of affiliation. There is no party registration in Texas.

Tuesday 5 March 2024 (presumably): Texas Primary. Hours reportedly 7:00a-7:00p CST (1300-0100 UTC) / 7:00a-7:00p MST (1400-0200 UTC). Only the area around El Paso is in MST, so the vast majority of polls have closed in TX by 7 PM CST. Delegate Binding: Winner-Take-Most Primary. Voter Eligibility: Open Primary. Write-in candidates are not allowed. [General Rules for All Conventions and Meetings. Rule 38. Section 3.e.]

Primary (preliminary)
Included in Nationwide vote.

All 162 of Texas's delegates to the Republican National Convention are bound to presidential contenders in today's Texas Presidential Primary [General Rules for All Conventions and Meetings. Rule 38.].

• 114 district delegates are to be allocated to presidential contenders based on the primary results in each of the 36 congressional districts: each congressional district is assigned 3 National Convention delegates. These delegates are allocated to the presidential contenders as follows:
• If a candidate receives a majority of the vote (more than 50%), that candidate is allocated all 3 of the district's delegates. [General Rules for All Conventions and Meetings. Rule 38. Section 8.a. and 8.b.]
• If no candidate receives a majority of the vote and at least 1 candidate receives 20% or more of the vote, the candidate with the most votes (plurality) receives 2 delegates and the candidate receiving the next highest number of votes receives 1 delegate. [Rule 38. Section 8.b.]
• If no candidate receives 20% of the vote then the top 3 vote getters each receive 1 delegate. [Rule 38. Section 8.c.]
• 48 at-large delegates (10 base at-large delegates plus 35 bonus delegates plus 3 RNC delegates) are to be allocated to the presidential contenders based on the primary results statewide. These delegates are allocated to the presidential contenders as follows:
• If a candidate receives a majority of the vote (more than 50%) that candidate is allocated all 48 at-large delegates. [Rule 38. Section 9.a. and 9.b.]
• If no candidate receives a majority of the vote and at least 2 candidates receive 20% or more of the vote, the 48 at-large delegates are allocated proportionally among those candidates receiving 20% or more of the vote. Rounding rules: Beginning with the candidate receiving the largest number of votes, round any fraction to the next whole number of delegates. Continue this process with the next highest vote getter and repeat until all the delegates are allocated. [Rule 38. Section 9.b.]
• If no candidate receives a majority of the vote and only 1 candidate receives 20% or more of the vote, the 48 at-large delegates are allocated proportionally between the candidate receiving 20% or more of the vote and the candidate receiving the next highest number of votes. Rounding rules: Beginning with the candidate receiving the largest number of votes, round any fraction to the next whole number of delegates. Continue this process with the next highest vote getter and repeat until all the delegates are allocated. [Rule 38. Section 9.b.]
• If no candidate receives 20% of the vote, allocate the 48 at-large delegates proportionally. Rounding rules: Beginning with the candidate receiving the largest number of votes, round any fraction to the next whole number of delegates. Continue this process with the next highest vote getter and repeat until all the delegates are allocated. [Rule 38. Section 9.c.]

Primary (preliminary)

In addition to the ballot listing of the names of the qualifying Presidential candidates, there shall appear at the bottom of such listing ... a place designated "Uncommitted" ... [Rule 38. Section 3.b]

A Presidential candidate may withdraw from participation in the Presidential Primary ... by filing with the Secretary of the SREC a signed and acknowledged request ... votes cast for that candidate shall be deemed votes for uncommitted [Rule 38. Section 2.d and 2.e]

Once the polls are closed, Precinct Conventions may be convened. While most Precinct Conventions occur on primary election day, they can occur at different dates including the Saturday following the primary, the Friday evening prior to or, the morning of the County and Senatorial District Conventions. The Precinct Conventions elect delegates to the County and Senatorial District Conventions.

Circa March 2024 (date not set): County and Senatorial District Conventions. Delegates are elected to the State Convention.

Circa May 2024 (date not set): The Texas Republican State Convention convenes in Houston. The National Convention delegates are elected on the according to the results of the primary on the last day of the convention. [General Rules for All Conventions and Meetings. Rule 38.]

• 114 district delegates are elected: 3 from each of the state's 36 congressional districts.
• 45 at-large delegates (10 base at-large delegates plus 35 bonus delegates) are elected.
• The 3 party leaders, the National Committeeman, the National Committeewoman, and the chairman of the Texas's Republican Party, will attend the convention as pledged delegates by virtue of their position.

National Convention delegates are:

• bound for the 1st ballot unless "released from the pledge only in the event of death, withdrawal, or by decision of the candidate". [Section 10.b.1]
• bound for the 2nd ballot unless "released from the pledge if the candidate has failed to receive 20% or more of the total vote ... or by decision of the candidate.". [Section 10.b.2.]
• released for the 3rd and subsequent ballots. [Section 10.b.3]