The Yosemite National Park web site has a page showing all Tioga Road opening dates since 1980. The latest date ever was in 1998 when the road opened on July 1.
That was the year I crossed over the pass on the next weekend on my way home from the Markleeville Death Ride and saw people still sking at the pass, water rushing everywhere, and a good portion of Tuolumne Meadow filled by a lake.
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