College football · Week 5 2026 · Saturday, October 3
Purdue vs Illinois prediction and pick
Our Purdue Boilermakers at Illinois Fighting Illini pick: Illinois by 16.8, 85% to win. The forecast rates every team against the opponents it has played, this season and last, and adds home field. No betting information goes in.
Updated every day until kickoff, then frozen and scored. After the game this page shows who deserved to win.
Why the curves are so wide: luck. Even with both teams’ strength known exactly, one game’s bounces, kicks, calls and sequencing move the final margin by about ±12.1 points (one standard deviation, measured from every play since 2019). These forecasts carry ±16.0, so about 57% of the width is that luck; the rest is what nobody knows yet about the teams. That is why a 7-point favorite still loses about 3 times in 10.
Coin-flip wins: the wins each team’s games were worth with only the kicks, bounces, drops and calls re-rolled, the record adjusted for luck. Luck in wins: actual wins minus what the play was worth.
Purdue vs Illinois: questions and answers
Who will win Purdue vs Illinois?
Our forecast picks Illinois, with 85% to win; Purdue win 15% of the time.
What’s the spread for Purdue vs Illinois?
Our spread: Illinois −16.8. The betting line isn’t out yet. Ours uses no betting information, so where the two differ is where our read of the teams differs from the market’s.
When is Purdue vs Illinois?
Saturday, October 3, 2026, at 4:15 pm ET, at Memorial Stadium (Champaign, IL).
Purdue at 
Illinois
