A new report released for last Friday's avalanche said a group of three skiers were on Saddle Peak, just south of the Bridger Bowl ski area.
All three knew the avalanche danger was high, it said, and one of the skiers was with a group that triggered a large avalanche a few days prior.
Saddle Peak is a popular spot for backcountry skiers and snowboarders. In fact, according to the report, skiers had already taken runs down the slope that day.
But it was Casey Lewis' first time down when she was caught in the slide.
"As soon as they cross that boundary line, whether they're one or two feet on the other side of that boundary line, they might as well be one or two miles away in any backcountry area" said Bridger Bowl marketing director Doug Wales. "We're not doing control work out there."
Wales said that even though skiers ride the ski area's lift then hike to Saddle Peak, it's up to the individuals to make the judgement whether to step out-of-bounds.
"When anybody's making that personal choice to go in the backcountry, they need to take it upon themselves to do their own research" Wales said.
That means knowing what the avalanche rating is. The report said the three skiing that day all knew the danger was high but went anyway.
"I couldn't name all the points and shoots out there but I know how to get back down" said Rock Mees, about snowboarding in the backcountry.
Mees said he likes going in the backcountry.
But once, he got lost for hours. After finding out first hand how dangerous it can be, he always takes precautions- including staying away when avalanche danger is high.
"If it's more than moderate, I don't really care about going" Mees said.
Other back-country enthusiasts agreed.
"Yeah it's not worth it when the avalanche is high" said skier Colin Ruh. "At the beginning of this season it wasn't that high, and it was nicer to go up there. But right now, no."
Avalanche experts said even for the most experienced, all it takes is one bad run to trigger a deadly slide.
NBC Montana checked with Search and Rescue to see how much it costs every time they're called out.
Lieutenant Jason Jarrett told us they divide a year's worth of bills by how many missions they went on.
Lt. Jarrett said it totals about $280 per rescue.
Of course, some rescues are more expensive than others, he said. For instance, the Saddle Peak avalanche required a helicopter.
Click here to see the complete Saddle Peak avalanche report.