CFB
SpreadTotalMoneyWSU+2.5U 48.5+120SDSU-2.5O 48.5-142
CFB · Saturday 31 October
Washington State vs San Diego State Best Pick, Prediction and Odds
Our number has San Diego State by 11.2. At -2.5, take San Diego State.
San Diego State is a 2.5-point favorite over Washington State at DraftKings. Our prediction is San Diego State by 11.2. That puts the gap at 8.7 points on San Diego State’s side, and the threshold for a bet is 3.
The prices and what they say
The spread is San Diego State -2.5 at -115 and Washington State +2.5 at -105, read 30 October 2026 at 00:40 UTC at DraftKings via ESPN. The line opened at San Diego State -2.5 and has not moved.
The moneyline is San Diego State -135 and Washington State +114. A book builds in a margin, so the two prices imply chances that add to more than 100%. With the margin taken out, the market gives San Diego State 55.1% and Washington State 44.9%. ESPN’s FPI is close to that: 56.8% and 43.2%. The market sees a near coin flip. We see an 11-point game.
How 11.2 is reached
The method in one clause: our home margin is half the difference between the home team’s average margin at home and the visitor’s average margin on the road, against FBS teams only, 2025 and 2026 together. Bowl and playoff games are neutral and stay out.
San Diego State is 7-1 at home against FBS teams over that span, winning by 12.0 points a game. Washington State is 1-9 on the road against FBS teams, losing by 10.4 a game. Half the difference between 12.0 and -10.4 is 11.2. Against a spread of 2.5, that is a gap of 8.7.
The base is 18 games: 8 for San Diego State, 10 for Washington State. Both clear the 4-game minimum the rule sets. Eighteen games is enough to run the rule. It is not enough to call 11.2 precise to the decimal.
This season so far
None of this is in our number. San Diego State is 3-5, 2-2 in the Pac-12 and 2-5 against FBS teams, with a margin of -15.7 a game in those seven. Its last game was a 56-49 loss at Colorado State on 24 October.
Washington State is 1-7, 0-4 in the conference and 0-7 against FBS teams, at -15.9 a game in those seven. It has lost five straight, the last 31-10 at home to Boise State on 24 October. Its one win was 48-7 over Duquesne, a team outside the FBS.
On 2026 alone the two teams are almost level against FBS opponents. That is the market’s case, and it is the weak side of ours.
San Diego State at home, Washington State on the road
San Diego State went 6-0 at home in 2025. This season it is 3-1 at home: 53-20 over Portland State, which is outside the FBS, then a 26-13 loss to James Madison on 19 September, a 31-29 win over Texas State and a 26-23 win over Fresno State on 17 October. The James Madison game is the one loss in the 8-game home sample.
Washington State’s road games are the larger half of the gap. In 2025 it went 1-5 on the road. This season it is 0-4 away: 24-10 at Washington, 34-7 at Kansas State, 17-16 at Utah State and 48-30 at Oregon State.
The halves the method leaves out are the bad ones for San Diego State. Its 2026 road results include a 66-14 loss at Oregon State and a 41-16 loss at Toledo. Those games say this defence can collapse. They were not played in San Diego, and the method only asks how San Diego State does there.
The season around it
In 2025 San Diego State went 9-4, 8-4 against FBS teams, scoring 26.4 a game and allowing 15.4, a margin of +11.0. It lost its bowl game 49-47 to North Texas on 27 December 2025, at a neutral site. Washington State went 7-6, 6-6 against FBS teams, at +2.3 a game, and won its bowl 34-21 over Utah State on 22 December 2025.
Neither team is ranked in the AP Poll, Week 9. One opponent is common this season: San Diego State beat Fresno State 26-23 at home, and Washington State lost 26-6 to Fresno State at home on 3 October.
The teams met once in the span. Washington State won 36-13 at home on 6 September 2025. That was a Washington State home game, so it sits in neither half of our number.
Pick: San Diego State -2.5
San Diego State -2.5 at -115, DraftKings, read 30 October 2026 at 00:40 UTC. The line opened at -2.5. The gap is 8.7 points against a 3-point threshold.
The bet rests on two seasons of venue splits. San Diego State’s home half is 7-1. Washington State’s road half is 1-9. This season’s overall form does not separate the teams, and the method does not ask it to.
What kills the bet
The line. San Diego State stays a bet up to -8.2, where the gap falls to the 3-point threshold. Anything longer is a pass. Washington State would need +14.2 or more to become the bet.
The risk is 2026. San Diego State is 2-5 against FBS teams and has lost by 25 points or more three times on the road this season. Our number trusts 18 games of venue splits over seven games of current form.
No injury information is stated here. Check the lineups before you bet.
The total and the moneyline
The total is 48.5, unchanged from the open, with the over and under both at -110.
Against FBS teams across 2025 and 2026, San Diego State’s games went over 48.5 in 9 of 19 and Washington State’s in 6 of 19. This season San Diego State’s seven FBS games produced 38, 39, 57, 60, 80, 49 and 105 points. Washington State’s produced 34, 41, 58, 32, 33, 78 and 41. That is a count. The method stakes the spread only, so there is no bet on the total.
The moneyline, San Diego State -135, is context. The spread is the market the method stakes, and the one bet here is San Diego State -2.5.
Washington State at San Diego State, Saturday 31 October, 7:00 PM ET, Snapdragon Stadium, San Diego. Prices: DraftKings via ESPN, read 30 October 2026, 00:40 UTC. Results: ESPN, 2025 and 2026 seasons, checked against Nucleus. Rankings: AP Poll, Week 9, 2026. Injuries: ESPN game page, read 30 October 2026, 00:39 UTC; nothing here states who is available.