Bonneville decided it would take its chances with a double-team on 6-foot-10 BYU signee Kolby Lee, leaving Rocky Mountain’s shooters a little extra room.
While the Bees (14-11) limited Lee to nine points and nine boards, they had less luck containing the Grizzlies’ outside game.
Senior guard Kobe Terashima notched a game-high 19 points, and junior guard Hunter Ranstrom added 11 points — including three 3-pointers — to move Rocky Mountain into the 5A state semifinals for the first time since 2014.
Rocky Mountain (24-1) plays Lewiston (14-8) in the 6:15 p.m. semifinal Friday at the Ford Idaho Center. The Grizzlies beat the Bengals 66-54 in last year’s consolation final.
“I just have a lot of confidence in my teammates, that if they are going to sag in on me, then my teammates will hit shots,” Lee said. “We’re a great shooting team, although we didn’t show it tonight. But that’s what I love about these guys. We find a way to win.”
The Grizzlies shot just 26.9 percent from the floor and led 18-13 at the half. Despite scoring a combined 43 points in the third and fourth quarters, Rocky’s five-point margin at the break proved crucial, as the Grizzlies gave up as many points as they scored in the second half.
“It’s good to win, for sure, especially when you don’t play your best basketball,” Rocky Mountain coach Dane Roy said. “My team really gritted it out, and a lot of times if you don’t play your best basketball at state, you’re going to lose.
“Our team was strong enough that we were still able to find a way to win.”
The Grizzlies made eight 3s and outrebounded the Bees 31-26, including 12 offensive boards that led to 11 points.
ROCKY MOUNTAIN 61, BONNEVILLE 56
Bonneville (14-11) — Coleman Clayton 6 points, Dillon Sorensen 18, Jaden Howell 14, Tyler Scoresby 10, Kehari Harrigfeld 8. Rebound leader: Harrigfeld 9. Assist leader: Clayton 3.
Rocky Mountain (24-1) — Kobe Terashima 19 points, Tyler O’Donnell 6, Jacob Erickson 5, Garrett Hall 6, Briggs Ranstrom 5, Hunter Ranstrom 11, Kolby Lee 9. Rebound leader: Lee 9. Assist leaders: Terashima, Erickson 3.