Primary elections for the purpose of determining the preferred candidates for President of the United States shall be held the first Tuesday in March each year in which a President is to be elected beginning in the year 2016. [§17-13-100a] [2016 Presidential Preference Primary Resolution. 2.]

This is an open primary. Voters may request a Democratic or Republican ballot, but not both.

Tuesday 1 March 2016 (presumably): Alabama Primary. Hours 7:00a-7:00p CST (1300-0100 UTC). Delegate Selection: Winner-Take-Most Primary. Voter Eligibility: Open Primary.

Primary
Source: Alabama Secretary of State.
Status: Official. Retrieved: Friday 11 March 2016.
Included in Nationwide vote.

Tuesday 1 March 2016 (presumably): All 50 of Alabama's delegates to the Republican National Convention are allocated to presidential contenders in today's Alabama Presidential Primary.

• 21 district delegates are allocated to presidential contenders, "winner-take-most", based on the results of the primary in each congressional district. Each of the 7 congressional districts is assigned 3 National Convention delegates.
• If a candidate receives a majority of the vote (more than 50%) or if only one candidate receives 20% or more of the vote, that candidate is allocated all 3 of the district's delegates.
• If no candidate receives a majority of the vote and more than 1 candidate receives 20% or more of the vote, the candidate with the most votes is allocated 2 delegates and the candidate with the next highest number of votes is allocated 1 delegate.
• If no candidate receives 20% of the vote, the 3 district delegates are proportionally allocated to the presidential contenders. See the rounding rules below.
• 29 (10 at-large, 16 bonus, 3 RNC) at-large delegates are allocated to presidential contenders, "winner-take-most", based on the statewide results of the primary.
• If a candidate receives a majority of the vote (more than 50%) or if only one candidate receives 20% or more of the vote, that candidate is allocated all of the 29 at-large delegates.
• If no candidate receives a majority of the vote and more than 1 candidate receives 20% or more of the vote, the 29 at-large delegates are to be proportionally allocated to the presidential contenders to those candidates receiving 20% or more the vote. See the rounding rules below.
• If no candidate receives 20% of the vote, the 29 at-large delegates are proportionally allocated to the presidential contenders. See the rounding rules below.
• Proportional allocation rounding: Round the delegate allocations to the nearest whole number. If the rounding allocates too few delegates, the candidate with the most votes receives the remaining delegate(s). If the rounding allocates too many delegates, the candidate who qualified for delegates receiving the fewest votes looses as many delegates as necessary.

In addition, 3 party leaders, the National Committeeman, the National Committeewoman, and the chairman of the Alabama's Republican Party, will attend the convention as pledged delegates by virtue of their position.

Primary
Source: Results from the Alabama Secretary of State.
Status: Official. Retrieved: Monday 25 April 2016.

Delegate election.

Delegates must file a Declaration of Candidacy on or before 6 November 2015. Delegate candidates may run in either the CD where he/she votes or for the statewide (at-large) positions, but not both. Delegates bind themselves to Presidential contenders on the Declaration.

There are 47 National Convention delegate "place numbers" on the primary ballot-- 3 for each of the 7 Congressional districts and 26 statewide. Delegates run for each "place number". A delegate's name and "place number" appears on the ballot below the Presidential candidate's name unless the delegate is unopposed for that "place number". If there is more than one candidate for a place number, the delegate receiving the most votes for that "place number" is elected. Should candidate withdraw, delegates for that candidate may either withdraw or become uncommitted.