Who is forecasted today to win the Idaho 1st District House race?
Updated Monday, October 26, 2026 · 8 days to Election Day · VotePredictor
Russ Fulcher is favored. The VotePredictor forecast gives Fulcher a 99% chance of beating Kaylee Peterson, with a predicted margin of Fulcher +28.2. That is a Safe R race: Fulcher wins in nearly every simulation, and Peterson in the other 1%.
What the forecast is built on
On its 2026 lines the district's 2024 presidential lean is R+43.5 relative to the nation. The House model starts from that lean, adds the national environment as a uniform swing, and weighs incumbency (Russ Fulcher holds the seat) and fundraising in the win probability.
- District polls: 3 polls averaging Fulcher +17.3, blended with the model by how much each is worth.
- The published forecast: Fulcher +28.2, a 99% chance for Fulcher.
How the forecast has moved
Daily tracking of this race began on Oct 26; the trend fills in from here.
The polls
3 polls are in today's forecast. Margins are Democrat minus Republican.
The polls behind it
3 polls · newest firstWhat everyone else says
Rating shops
| Forecaster | Rating | As of |
|---|---|---|
| Cook Political Report | Solid R | Oct 26, 2026 |
| Inside Elections | Solid R | Oct 15, 2026 |
All 2 rating shops favor Fulcher.
Can you trust this forecast?
Every VotePredictor forecast is scored after the election against the same outcomes as everyone else's. Across 615 past races (Senate, governor, House and president), our final forecasts rank #2 of every forecaster that covered them all (Brier score 0.075, lower is better); FiveThirtyEight is first at 0.074. The full record is on the forecaster rankings and methodology pages.
This article is regenerated every day from the VotePredictor forecast, the poll database, the prediction markets and the rating shops' latest published ratings. Live numbers are on the race page.