After weeks of speculation that that Mammoth may move up their opening date due to extensive early snowfall; Mammoth Mountain has officially announced an opening date of Oct 29, 2021. This two weeks earlier than their scheduled opening of November 13. It should turn out to be a pretty rad opening day with plenty of powder too. Local weather buff, Howard Sheckter, is calling for at least a few more feet in the atmospheric river that is headed our way Sunday into Monday. Scrap those Halloween plans because it's time to hit the slopes.