New Findings Reveal Castle Peak’s Deadly Toll

Snow-covered mountain with hiking trails and tourists under a cloudy sky — Photo: maodoltee / Shutterstock

All nine skiers killed in the Castle Peak avalanche near Lake Tahoe died of asphyxiation after being buried under deep snow, and investigators later said the group had been led into dangerous avalanche terrain.

Quick Take

Coroner reports released in August said all nine victims died from asphyxiation, not blunt trauma.
The avalanche killed a guided backcountry group near Castle Peak on February 17.
A final report said the group traveled below avalanche terrain and through the runout zone.
That report also said it remained unclear whether the slide was natural or triggered by the party.

Cause of Death Confirmed Months Later

Partially redacted coroner reports released Thursday showed that the nine backcountry skiers who died in the February avalanche near Lake Tahoe all died from asphyxiation caused by snow burial. Reporting said the victims were buried beneath five to six feet of snow, and one account said the burial depth reached as much as eight feet in parts of the slide zone.

That finding matters because avalanche deaths do not always happen the same way. Some victims die from trauma after being hit by snow, rocks, or trees. In this case, the reports point to suffocation as the common cause of death, which means the victims ran out of air after being trapped below the surface.

Investigators Focus on Terrain Choices

A final report from the National Avalanche Center said the group traveled below avalanche terrain and through the runout zone during a period when a natural or human-triggered avalanche was likely to very likely. The same report said there were no broken trees visible in the debris and that it was still unclear whether the avalanche was triggered by the party or was natural.

That detail gives the story its sharp edge. Public reporting says the guides led the group into a more avalanche-prone area, while investigators still had not pinned down the exact trigger for the slide. The report also said safer routes were available, which is the kind of fact families and readers will judge against common sense and basic duty of care.

What Happened on Castle Peak

The avalanche struck on February 17 near Castle Peak in the Sierra Nevada, north of Lake Tahoe, during a backcountry ski outing that included guides and guests. Earlier reporting said six people survived and nine died, making it one of the deadliest avalanches in modern California history.

After the slide, rescue crews worked through severe weather and unstable snow while searching for trapped skiers and recovering bodies. Later reporting said some victims had avalanche airbag backpacks, but none deployed during the disaster. That equipment can help in a slide, but it cannot fix a bad terrain decision once a group is already caught in the runout zone.

Why the New Findings Matter

The new coroner findings close one major question by confirming how the victims died, but they do not answer every question about why the slide happened. Investigators were still reviewing whether the avalanche was natural or human-triggered, and the broader report left room for that uncertainty.

For readers, the basic lesson is plain: avalanche terrain can punish a single wrong choice fast. The Castle Peak report says the group entered a dangerous zone when avalanche danger was already high, and the coroner findings show how little margin for error existed once the snow came down.