Utah State (15-2, 4-0 WAC) won its 18th-consecutive conference game, including eight-straight on the road.
Boise State (11-6, 4-1), which had started conference play with four-straight wins for the first time since joining the WAC prior to the 2001-02 season, was led by Robert Arnold's game-high 20 points.
The outing was Arnold's fourth this season of 20-or-more.
After a rocky start - the Broncos held the Aggies scoreless for the first five minutes and a 0-for-8 start from the floor - Utah State took a 17-15 lead and never relinquished it.
Trailing 52-43 midway through the second half, the Broncos went on a 7-0 run to pull within two (52-50) with 7:26 left.
Utah State responded with a 6-0 run and the Broncos could not get closer.
Westly Perryman (12) and Daequon Montreal (10) were each in double figures for the Broncos. La'Shard Anderson tied his career high with six steals, and also added a game-high six assists.
The Broncos close their homestand Saturday against Nevada. Tip-off is scheduled for 8:30 p.m., at Taco Bell Arena.