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 second annual Gavitt Tipoff Games, eight games between members of the Big East and Big Ten to be played Nov. 14-18, will feature Villanova at Purdue in the opener.
Michael Lewis is leaving his assistant coaching job at Butler to take the same position at Nebraska under Tim Miles.
College basketball fans should be excited about next season's Jimmy V Classic, an event that will feature Duke's heralded freshman class.