Montana’s 2026 Senate general election occurs in a midterm cycle with roughly 740,000–790,000 registered voters, following a June primary that set a raw-vote record of about 300,000 ballots (37.9% turnout) even as the participation rate among registered voters continued to ease. Historical patterns show general-election turnout typically falls between presidential-year highs near 610,000 and lower midterm levels around 470,000, with the current fragmented field—Republican Kurt Alme holding a consistent lead over Democrat Alani Bankhead and independent Seth Bodnar—producing limited additional mobilization pressure. Population growth and rising registration have lifted the ceiling on raw votes, yet the absence of a highly competitive statewide contest or unusual national salience keeps trader estimates clustered across the 400,000–600,000 ranges. Late-cycle factors such as weather, absentee trends, and get-out-the-vote intensity remain the primary variables that could shift final participation.