Utah was shut out for only the second time this season, the other time being Oct. 20 at Alaska.
This game turned when Idaho scored three goals during a seven-minute stretch of the second period, leaving coach Kevin Colley speechless.
"I'm probably going to have to keep my comments to myself right now," he said. "I don't even know where to begin. But it's my job to find a solution."
The Grizzlies lost for the seventh time in 11 games after Idaho's Tristan King scored twice and assisted three times before a matinee crowd of 2,421.
"I haven't been stomped like this in five years as a coach, to be honest with you," said Colley.
He admitted being frustrated "with a group that has quite a bit of potential, I think, but isn't close to competing the way I envision. It's sad."
Utah actually played decently in the opening minutes before taking two back-to-back penalties.
First, Berkley Scott was called for interfering with Idaho goalie Josh Robinson. Forty-one seconds later, Colin Vock was called for cross checking during a scrum in front of Grizz goaltender Shane Owen.
The Steelheads took advantage of their 5-on-3 when Tyler Gron scored with 7:08 remaining in the first period.
It was downhill from there.
Idaho started the second period on another power play, and just after it expired, the Steelheads made it 2-0 on Matt Case's blast from the left face-off circle.
With 14:56 left in the period, King gave Idaho a 3-0 lead. Then, David Toews capped the blitz on a deflection with 10:40 remaining in the period.
Steelheads 6, Grizzlies 0
R Tristan King scores two goals as Idaho rolls to an easy victory.
• The Steelheads score three goals during a seven-minute stretch of the second period.
• The punchless Grizzlies are shut out for only the second time this season.