I was there last week and it had started, so it should be peak right about now.
BUT NOTE ---> It appeared from what I saw last week, this is going to be a disappointing year for the Lee Vining/June Lakes/Lundy canyon fall color. My advice would be to check out the areas further south out of Bishop like Lake Sabrina.
Also, Yosemite looks like it could be promising in a few more weeks...
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