Idaho Code § 34-1405A: withdrawal of candidacy.

A candidate for nomination or candidate for election to an office may withdraw from the election by filing a notarized statement of withdrawal with the officer with whom his declaration of candidacy was filed. The statement must contain all information necessary to identify the candidate and the office sought and the reason for withdrawal. A candidate may not withdraw later than 5:00 p.m. on the ninth Friday before an election.