The Grizzlies (19-1, 23-6 Big Sky) earned the top seed and hosting privileges for the conference tournament earlier on Saturday, when Sacramento State lost against Montana State.
Max Jacobsen led the Lumberjacks (8-12, 11-20) with 17 points, but only three after intermission. Northern Arizona earned the No. 7 seed in the conference tournament and plays No. 2 Weber State on Thursday.
Montana led 49-48 with six minutes remaining before a 12-1 run broke open the game.
The Grizzlies, who are 36-2 against Big Sky opponents the last two seasons, earned a bye to Friday's tournament semifinals and will play the highest remaining seed after Thursday's games.
The 2017 recruiting class is short on point guards, with Trevon Duval leading only eight prospects from the ESPN 60 who are still available.
ESPN college basketball reporter Andy Katz looks into the two decommitments from the NBA draft and what they're looking forward to.
With a trio a top recruits from Philadelphia, the Penn State basketball program is primed to finally turn a corner.