Idaho State (3-3) jumped out to a 52-0 lead through three quarters. Simon Fraser got on the board with 10:57 in the fourth quarter on Justin Buren's 25-yard touchdown reception.
Idaho State's Xavier Finney carried the ball 19 times for 114 yards and two touchdowns, and backup Jakori Ford rushed three times for 144 yards and had scoring runs of 72 and 69 yards. KW Williams caught eight balls for 129 yards and a score.
Arias played until the 5:59 mark of the third quarter, when he was replaced by James Delacenserie. Arias had scoring throws of 72, 50, 6, 2, and 37 yards.
Ryan Stanford threw for 190 yards and two touchdowns, one throwing and one rushing, for Simon Fraser (1-5).