On 24 August 2020, the RNC approved the Rules of the Republican Party for the 2024 Presidential Nomination calendar. See Rules 16 and 17.

The "carve-out" states of Iowa, New Hampshire, South Carolina, and Nevada (designated with a ‡) may begin their process on 1 February 2024. All other states must wait until Tuesday 1 March 2024.

• If any ... state Republican Party violates Rule No. 16(c)(1) [beginning before 1 March] ..., the number of delegates ... shall be reduced for those states with 30 or more ... delegates to 9 plus the members of the Republican National Committee ..., and for those states with 29 or fewer ... to 6 plus the members of the Republican National Committee ... ." [Rule 17(a)].

The Republican jurisdictions are listed below in chronological order according to their first major delegate selection event. Many of these events are primaries whose dates are established by state law. Hence, it would take an act of the state legislature to move the date. The issues:

• State legislatures might change their election laws and state parties might change their caucus dates to comply with the new rules.
• States could ask for a waiver to be "grandfathered" to the date set by law prior to the adoption of this rule.
• If any state retains their February date, the "carve-out" states are likely to move their dates into January. For example, New Hampshire law [RSA 653:9] states that their Presidential primary is held "... on a date selected by the secretary of state which is 7 days or more immediately preceding the date on which any other state shall hold a similar election..."

"Some form of proportional delegate allocation" is required for events before 15 March 2024. This provision does not apply to the four "carve-out" states (Iowa, New Hampshire, South Carolina, and Nevada).

By "proportional", the RNC means

• Delegates who are bound to Presidential candidates based on the statewide or Congressional District vote may not be bound "winner-take-all" before 15 March 2024. However, a state may set an up to 20% qualification threshold (that is, a candidate must receive 20% or more of the vote in order to qualify for delegates) and a state may set a 50% or more winner-take-all threshold (that is, if a candidate receives 50% of the vote, that candidate receives all of the delegates).
• The proportional allocation rule does NOT apply to delegates directly elected in a primary, or National Convention delegates who are NOT bound to vote for a particular candidate.

Other winner-take-all notes:

• About 11 states use a pure winner-take-all (WTA) election.
• Several states use a "winner-take-most" formula. That is, a primary or caucus with proportional and WTA components.

On 21 December 2022, the date of the 43rd Republican National Convention was announced as Monday 15 July - Thursday 18 July 2024. According to Rule 16(c)(1) "No ... process to elect, select, allocate, or bind delegates to the national convention shall occur ... less than 45 days before the national convention is scheduled to begin" which means all delegate allocations must be settled on or before Friday 31 May 2024.

Circa or presumably-- an unofficial date. An unconfirmed Presidential Primary established by currently-effective State statute or introduced bill; or- where the foregoing information could not be obtained- the state's prior delegate selection process and associated dates adjusted to the corresponding dates in the current year.

‡ Pre-window state.