Snow began in California on the night of Sunday, February 15, with forecasters calling for of snow potentially falling along the
Sierra Crest, including
Donner Pass with the heaviest snow projected for February 16 through the 17th in the Sierra. By February 17, snow accumulation reached in the
Sierra Nevada region, where Lake Tahoe is located. An avalanche warning was issued for the Lake Tahoe region early on the 17th, which remained in effect until February 19, the warning also said avalanches up to D3 in size were likely, or avalanches large enough to bury a car or house. The skiing group left for Frog Lake on February 15. The group consisted of 11 skiers and four tour guides, and multiple were associated with the Sugar Bowl Academy, a private school and US Ski and Snowboard club for ages between 5 to 23 years old. The trip was meant to last three days and return on February 17. The group was scheduled to trek to Frog Lake, an alpine lake a few miles northeast of the
Donner Party disaster, then stay in the Frog Lake huts for two nights while backcountry skiing before returning. == Avalanche ==