ID · State rules
Idaho
Primary system
Partially closed
Who can vote in a party primary
Parties choose each cycle whether unaffiliated voters may participate
Party-switch deadline
Last day of candidate filing (~88 days before primary)
Note: Check each party’s current-cycle rule; affiliated voters must switch by deadline.
This cycle's dates
Next primary
Tuesday, May 19, 2026
Party-switch deadline
Friday, February 20, 2026
Registration deadline
Friday, February 20, 2026
Computed from the standing rule + NCSL's 2026 primary calendar (fetched 2026-07-27). Not yet checked against the official state source for weekend/holiday rollover or this cycle's final confirmation — verify before relying on it.
Verification pending Last checked: 2026-07-27
Draft sourced from NCSL. View source.