MT · State rules

Montana

Primary system

Open

Who can vote in a party primary

Any voter picks any one party’s ballot; no party registration

Party-switch deadline

N/A — no party registration

Note: Full crossover freedom every cycle.

This cycle's dates

Next primary

Tuesday, June 2, 2026

Party-switch deadline

No deadline — no party registration required

Registration deadline

Check official site

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

Official state election site → What does this mean for me? →

Draft sourced from NCSL. View source.