Idaho

Find nonpartisan voter education and local coverage for Idaho. A summary of Idaho voting rules is below, and each county on the map has its own page.

Explore Idaho Counties

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All 44 Idaho counties (A–Z)

Voting in Idaho

Voting rules are set by each state. This is a summary of Idaho voting rules, checked Nov. 4, 2026, from Vote.gov (U.S. government), the National Conference of State Legislatures (NCSL) and Ballotpedia. Rules and dates can change, so confirm with Idaho’s official election website or your local election office before each election.

Registering to vote

Online: by 11 days before Election Day.
By mail: must be received 11 days before Election Day.
In person: available through Election Day (same-day registration).
Register or check your registration (Idaho on Vote.gov)

Primary elections

Idaho parties set their own rules: the Democratic primary is open to all voters, and the Republican primary is closed to registered Republicans. Unaffiliated voters can affiliate with a party on primary day.

Voter ID

Idaho asks voters to show a photo ID. If you don’t have one, there are other ways to cast a ballot that counts, such as being identified by a poll worker or signing an affidavit, depending on state rules.

Early voting

Starts: On or after the fourth Monday before election (in-person absentee). Ends: 5 p.m., Friday before election. Locations and hours are set locally.

Voting by mail

Any Idaho voter can request an absentee/mail ballot. No excuse is needed.

Your local election office

Find contact information for your local election office on Idaho’s official election website.

Sources: Vote.gov (registration deadlines); NCSL voter ID (updated Sept. 3, 2026), early voting (updated Aug. 11, 2026) and absentee voting (updated July 17, 2026); Ballotpedia primary types (as of Aug. 2026).