Idaho
Requirements
will be at least 18 years old on election day
are a citizen of the United States, AND
have resided in Idaho 30 days and in the county 30 days.
Not be a convicted felon whose sentence has not been discharged or pardoned.
Not be presently adjudged as mentally incompetent as to your ability to vote by a court of competent jurisdiction.
https://idahocounty.org/clerk-auditor/election-information/voter-registration-and-faq/
Voter Registration Forms
https://sos.idaho.gov/elect/clerk/forms/Absentee_Ballot_Request.pdf (PDF)
Election Info
ID Required: Yes
Same-Day Registration: Yes
Deadlines
New Voter Registration: October 9th
Absentee Ballot request
Request for Postal Ballot: October 23rd
In-Person Request: October 30th
Absentee ballots must be received by November 3rd