Tioga Pass & Sonora Pass REOPEN in CA After Large Snowstorm: 9,945′ Tioga Pass and 9,624′ Sonora Pass in California closed last Thursday due to a large snowstorm that dropped 18″ on Mammoth Mountain, CA. They have both now reopened after those roads have been cleared of that new snow. Tioga and Sonora passes had near record early openings this year both being opened completely by April 17th, 2015. We drove over Tioga pass last Wednesday and the skiing near the road was nothing to write home about. We chose not to ski Ellery Bowl due to lack of snow. Report here: […] Industry News SnowBrains | May 11, 2015 6 Comments