Only voters who are registered in the Republican Party are eligible to vote in the Republican Presidential Primary.

Tuesday 22 March 2016: Arizona Primary. Hours 6:00a-7:00p MST (1300-0200 UTC). Delegate Selection: Winner-Take-All Primary. Voter Eligibility: Closed Primary.

Primary
Source: Arizona Secretary of State.
Status: Official. Retrieved: Wednesday 6 April 2016.
Included in Nationwide vote.

Tuesday 22 March 2016: All of 58 of Arizona's delegates to the Republican National Convention are pledged to the presidential contender receiving the greatest number of votes in today's Arizona Presidential Primary.

Saturday 26 March - Saturday 9 April 2016 (presumably): The Arizona Legislative District and County Conventions elect delegates to the State Convention and Congressional District caucuses.

Saturday 30 April 2016 (presumably): The Arizona State Convention convenes. Delegates are elected according to the results of the primary.

• 27 district delegates to the Republican National Convention are chosen with 3 delegates selected in each of the 9 congressional districts.
• The State Convention chooses 28 at-large delegates from Arizona to the Republican National Convention.

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

... each delegate to the national convention shall vote for the party's presidential nominee candidate who received the greatest number of votes in the presidential preference election ..., until the candidate releases the delegate from the delegate's obligation, until a candidate withdraws from the race or until one convention nominating ballot has been taken. After a candidate is nominated, withdraws from the race, delegates are released or one ballot is taken, each delegate is free to vote as the delegate chooses .... [Arizona Revised Statutes 16-243]

4 January 2013: State Representative Phil Lovas (Republican-Peoria) introduces HB 2017 which would set the date for the 2016 Arizona Presidential Preference Primary to the same day as the Iowa Caucuses,

On 16 April 2014, Governor Janice K. "Jan" Brewer (Republican) signed HB2107. The bill changes the Presidential primary from the 4th Tuesday in February to the Tuesday immediately following 15 March.

6 January 2015: Phil Lovas (Republican) prefiles HB 2015 which would Arizona’s presidential primary to the "same date on which the Presidential Caucuses are held in Iowa."
3 April 2015: HB 2015 died when the state legislature adjourned sine die.