Idaho Code § 31-403
Not less than ninety (90) days nor more than six (6) months prior to the date specified in section 31-402, Idaho Code, a petition may be circulated in any county praying for the consolidation of such county with another county. Such petition shall be entitled in the district court of the former county, and shall be in substantially the following form:
"The undersigned qualified electors of .... County, State of Idaho, hereby petition the court thereof to order an election to be held on the first Tuesday following the first Monday of November in an even-numbered year to determine whether said .... County shall be consolidated with .... County (naming the county with which it is desired to consolidate), under the provisions of the law applicable to such elections."
Such petition may consist of any number of copies required for convenient and rapid circulation and the various copies shall be considered as one (1) petition. If said petition, within the time limits hereinbefore fixed, is signed by a number of qualified electors of the county which it is proposed to consolidate, equal in number to two-thirds (2/3) of all votes cast therein at the last general election, such petition shall thereupon, and not later than eighty (80) days prior to said election date, be filed with the clerk of the district court of such county. Such petition shall be deemed a proposal to consolidate said county with the county named therein.
Idaho Code § 31-403