Idaho's 1st congressional district remains a solidly Republican seat with an R+22 partisan voting index, where incumbent Russ Fulcher faces Democrat Kaylee Peterson and independent Sarah Zabel on November 3. Recent polling and forecasts project Fulcher winning by roughly 25-32 points, aligning with historical results such as the 2024 presidential margin exceeding 45 points. Fulcher's primary victory in May, combined with a fundraising advantage and the district's consistent Republican performance, supports trader consensus on mid-20s to mid-30s margins. Limited late-cycle activity, including ongoing early voting and few new surveys, has kept probabilities stable around those ranges, with Democrat victory odds below 5%. Any shift would likely require unexpected turnout changes or late developments in the final days.