The Broncos qualified for a major bowl as the top-ranked champion from a group of five conferences without New Year's bowl contracts.
Boise State (11-2), which claimed a share of the conference title in 2012, won its first outright league championship since joining the Mountain West four years ago.
Boise State is the highest ranked — and only ranked — team from outside the Big Five conferences, which puts the Broncos (10-2) in position to receive a bid to one of the four New Year's Day bowls.
The game will air on KBOI.
Jay Ajayi rushed for a career-high 229 yards and five touchdowns as the Broncos crushed Utah State 50-19 on Saturday night and secured a spot in the Mountain West title game next week.
Boise State wins 86-75.
Boise State moved in the rankings at No. 23 and unbeaten Marshall is 24th.
The injured wide receiver will be honored Saturday during Senior Day.
A lot of possibilities for Boise State, but they all rely on a win this weekend.
On a frigid night in Laramie, Boise State trounced Wyoming, 63-14.
Frank Kaminsky scored 26 points and No. 3 Wisconsin beat Boise State 78-54 on Saturday night.
College of Idaho now 9-0.
Both teams win their home opener.
Bryan Neba left Africa for a better education, wound up at NNU.
Taco Bell Arena will host first and second-round games in 2018.