Idaho's US Senate race features incumbent Jim Risch facing independent Todd Achilles in a contest rated safe Republican by forecasters. Trader consensus clusters around 600k-720k total votes because registered voters have reached roughly 974k amid ongoing population growth, building on the 591k cast in the 2022 midterm. Midterm participation rates, limited campaign intensity in a non-competitive seat, and variable early and absentee ballot usage create the spread across bins. Late shifts in enthusiasm, weather on November 3, or final registration surges before the October 23 deadline could widen the range, while historical turnout patterns in safe states anchor expectations near the middle bins.