The Nittany Lions dominated from the start of the game, recording two goals within four minutes of each other in the first half.
A goal from Van Danielson helped the Nittany Lions earned a share of the Big Ten regular-season title Sunday in Madison.
The ranking comes after the Nittany Lions' 33-24 victory over Indiana Saturday in Beaver Stadium.
The Nittany Lions lost to Michigan State in East Lansing for the first time since 2002.
Allar tossed three touchdowns and 210 yards in the 33-24 win.
The Nittany Lion defense was mistake-prone during Saturday's win, but made big plays when it needed to.