Idaho Vandals vs Portland State Vikings Predictions

Wood draws Portland State’s struggling pass defense

The strongest case for Idaho begins with Joshua Wood. The quarterback has thrown for 2,189 yards, 14 touchdowns and six interceptions while rushing for 396 yards and four scores. The Spokesman-Review reports that Portland State allows 321.6 passing yards and 43.3 points per game, making Wood the clearest reason to consider Idaho at the SPF price of -9.5.

Idaho has also won the past two meetings, 45-6 in 2025 and 39-30 at Hillsboro Stadium in 2024. Those results favor the Vandals, but Idaho’s 3-5 overall record makes its -352 moneyline difficult to justify.

Portland State can challenge the spread

Portland State running back Delon Thompson has 643 rushing yards and five touchdowns, while receiver Terence Loville has 36 catches for 553 yards and two scores. Their production gives the Vikings two ways to threaten an Idaho cover.

The Vikings have split quarterback work between Gabe Downing and Tyrese Smith, and no starter is confirmed. Downing has two touchdown passes and five interceptions in five appearances; Smith has two touchdowns and one interception in four. That unsettled position makes Portland State’s scoring harder to project.

Portland State also beat Weber State, which Idaho failed to do this season. One common opponent shouldn’t outweigh Wood’s matchup, but it warns against assuming last year’s 39-point Idaho win will repeat.

Prediction and betting lean

Idaho is the likely winner, and laying 9.5 points offers a better potential return than paying -352 on the moneyline. Wood’s production against Portland State’s pass defense supports the spread lean, though Idaho’s losing overall record and the Vikings’ skill players keep confidence at medium.