Idaho Code § 22-302
The respective boards shall meet in their respective counties on the day fixed and canvass the petitions, and ascertain that they are signed by the requisite number of voters, and that they are in due form. Any voter within the county may appear and object to the form of petition or the genuineness of the signatures, or that the required number of voters have failed to sign. If the board finds that the petition is in due form, signed by the required number of bona fide voters, an order shall be made declaring that it is the wish of the voters of the county to form a fair district, comprising the respective counties named in the petition, and directing the clerk of the board of county commissioners to so inform the clerk of each of the other county boards of commissioners, and to arrange for a time and place for a joint meeting of the respective boards.
The clerk of the board shall thereupon inform, by writing, the clerks of each of the other boards, and suggest a time and place for a joint meeting. By a majority vote the clerks shall fix the time and place, and notify the commissioners. Notice of such joint meeting shall be published for two (2) weeks in a newspaper in each county. The meeting shall be not less than two (2) weeks nor more than four (4) weeks from the date of the clerks' agreement.
Idaho Code § 22-302