Green Party of Montana

The Montana Green Party is a state-level political party affiliated with the Green Party of the United States. It formed in 2001–2002 following Ralph Nader's run for president in 2000 as the Green Party nominee.

The party has run candidates for president, governor, lieutenant governor, US Senate, and the Montana legislature. It earned ballot access for the national party’s presidential candidates in 2004 and 2016.

In 2020, a controversy arose regarding the party’s ballot eligibility, after it was revealed that the state Republican Party had financed efforts to collect the required signatures and some voters who had signed the petitions asked to revoke their signatures. Following a series of legal cases, a US District judge ruled, and the state Supreme Court concurred, that the voters were entitled to revoke their signatures, and that as a result the Green Party had insufficient signatures to appear on the 2020 ballot.