Deadly California Avalanche Linked to Group Size, Risky Terrain

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A new report by the Sierra Avalanche Center examines the deadly avalanche in February that killed nine skiers, including three from Marin County, California. The report cites the size of the skiing group and the risky terrain they chose to traverse as key factors that 'very likely' played a role in the disaster. While many details remain unknown, the report highlights the importance of avalanche safety practices like exposing only one person at a time to hazardous areas.

Why it matters

Avalanche safety is a critical concern for backcountry skiers, especially in California's Sierra Nevada mountains where deadly slides have become more common in recent years. This report provides important insights into the factors that can contribute to avalanche accidents, which can help guide future safety protocols and decision-making for ski groups venturing into remote, high-risk terrain.

The details

According to the Sierra Avalanche Center's final report, the group of 15 skiers, including three from Marin County, chose to follow a route below historical avalanche terrain on February 17th. It's unclear whether the avalanche was triggered by the group or occurred naturally. The report notes that many details remain unknown, especially around the group's decision-making and travel plans. Two survivors who were at the back of the group provided accounts, but the report says other survivors closer to the front may have different information. Investigators also noted that several skiers were wearing avalanche backpacks, but none were deployed, as the devices must be manually activated to be effective.

• The deadly avalanche occurred on February 17, 2026.
• The Sierra Avalanche Center released its final report on the incident on April 3, 2026.

What’s next

As more details emerge from other survivors, the Sierra Avalanche Center plans to incorporate that information into its ongoing analysis of the incident to provide further insights into the factors that contributed to the deadly avalanche.