Austin Lee hit four 3-pointers and scored 29 points to lead the Thunder to a win in their season finale.
Kelso will head to the bi-district tournament next week as the No. 3 seed.
Mason Wulf added 26 points for Mountain View. Josh Webb had 17 to lead Kelso.
MOUNTAIN VIEW 86, KELSO 71
MOUNTAIN VIEW — Colby Smith 14, Kai Christensen 7, Austin Lee 29, Mahkakri Bolds 2, Mason Wulf 26, Jacob Martin 2, Ethan Blanchard 6, Dom Stephens 0. Totals 30 (10) 16-19 86.
KELSO — Josh Webb 17, Gage Tippery 9, Rees Hall 3, Wyatt Brown 12, Ethan Mitchell 15, Drew Tack 3, Dillon Davis 2, Tanner Davis 2 Totals 31 (5) 4-7 71.
Mtn.View 21 25 20 20–86
Kelso 12 16 18 25–71