The awards were announced Saturday evening in Butte.
Huestis, of Great Falls, averaged 11.2 points, 8.2 rebounds and 1.9 blocked shots per game for Stanford, which advanced to the NCAA Sweet 16. He blocked 69 shots this year and holds the Cardinal career blocks record.
Sullivan, of Sidney, averaged 11.6 points and led the Lady Griz with 7.3 rebounds per game. Montana posted a 23-11 record and won its first round game in the WNIT.
Other finalists were Olympic moguls skier Brad Wilson of Butte and Olympic freestyle qualifier Maggie Voisin of Whitefish, former Montana linebacker Jordan Tripp, former Montana State receiver Tanner Bleskin, Montana State basketball player Jackie Elliott and Montana soccer player Maddey Frey.