To be eligible to vote in Idaho you must meet the following requirements and register with your County Clerk.
Idaho statute § 34-104
“QUALIFIED ELECTOR” DEFINED. “Qualified elector” means any person who is eighteen (18) years of age, is a United States citizen and who has resided in this state and in the county at least thirty (30) days next preceding the election at which he desires to vote, and who is registered as required by law.
If you are qualified, fill out a voter registration form, sign and return it to your County Clerk.
Idaho has election day registration. You may register at your polling place on election day by providing proof of residence. All documents used in providing proof of residence must be accompanied with a photo ID. Only the following documents showing the registrant’s current address in the precinct are authorized:
• a valid Idaho driver license issued through the department of transportation
• a valid Idaho identification card issued through the department of transportation
• any document which contains a valid address in the precinct together with a picture identification card
• Students may also use a current valid student identification card from a post secondary educational institution in Idaho accompanied with a current student fee statement that contains the student’s valid address in the precinct together with a picture identification card.