Delegates to the State Delegate Convention are elected from each county by the County Central Committee at least 10 days before the State Convention. [Montana Republican Party Bylaws. Section B - III. D]

Saturday 14 May 2016 (presumably): State Convention / State Delegate Convention. The convention slates the state's Republican National Convention delegates and nominates Presidential Electors. [Section B - III. B. and F. 1 through 7)]

Tuesday 7 June 2016: Montana Primary. Hours 7:00a-8:00p MDT (1300-0200 UTC). A polling place with less than 400 registered voters must be open at least from noon to 8 p.m. or until all registered electors have voted. Delegate Selection: Winner-Take-All Primary. Voter Eligibility: Open Primary.

Primary
Source: Montana Secretary of State.
Status: Official. Retrieved: Friday 1 July 2016.
Included in Nationwide vote.

Tuesday 7 June 2016: Montana Presidential Primary. The candidate receiving the most votes receives all of Montana's 27 delegates.

The 3 party leaders, the National Committeeman, the National Committeewoman, and the chairman of Montana's Republican Party, will by virtue of their position, attend the Republican National Convention bound to vote for the winner of the Montana Republican Primary.

All of Montana's delegates ... are bound to vote for the winner of the Montana Republican Primary ... through the first ballot, if that candidate's name is placed in nomination.