Participation in Maine's delegate selection process is open to all registered voters who are enrolled in the Republican Party. Residents who are enrolled in another party must change their affiliation at least 15 days before the primary. A resident who is unregistered or not enrolled in any party may register to vote on the day of the primary.

Tuesday 5 March 2024 (presumably): Maine Primary. Hours reportedly 6:00a-8:00p EST (1100-0100 UTC). Voting places open between 6:00a Eastern Time and 10:00a Eastern Time depending on the size of the town. Delegate Binding: Winner-Take-Most Primary. Voter Eligibility: Closed Primary.

Primary (preliminary)
Included in Nationwide vote.

All 20 of Maine's delegates to the Republican National Convention are pledged to presidential contenders in today's Maine Presidential Primary.

• Statewide primary results will determine the number of delegates each candidate receives to the national convention. If any one candidate receives more than 50% of the vote, that contender receives all of Maine's delegates.
• Otherwise, delegates will be allocated to candidates who receive 10% of the vote; if no candidate receives at least 10% of the vote, this threshold is reduced to 5% of the vote.
• Starting with the candidate who received the most votes, the percentage is multiplied by the total number of delegates and rounded up to the next whole number. Repeat the process for each remaining candidate in descending order until all delegates are allocated.

Primary (preliminary)

If a Presidential candidate withdraws, the delegates bound to that candidate become unbound.

• 6 district delegates are elected by caucus participants-- 3 from each of Maine's 2 Congressional districts.
• 11 delegates are elected by the Maine State Convention as a whole.
• 3 party leaders, the National Committeeman, the National Committeewoman, and the chairman of the Maine's Republican Party, will attend the convention as bound delegates by virtue of their position.