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I assume that means that the MR & MT day hike permits are the same?Yes.
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Anyone know how many are available day to day (approximately)Check the far right column here:
Unused Whitney Permits - 2008. After giving out the no-shows, they show only one or two available Fri/Sat/Sun, but easy to get mid-week. I am sure there are many no-shows available starting at the 2 PM time. The Unused page numbers are what is left after all available are given out to those walking in and asking.
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and what time I need to be at the center the day before?(This info is available in the Wilderness Permit Options link above on the left in the Feature Topics box:)
For a Mount Whitney Zone (main trail or North Fork/MR) day hike permit, show up at the Visitors Center by 11 am the day BEFORE your entry date. Any cancellations that have not been re-reserved will become available then. If unsuccessful, report back to the Visitors Center by 2 pm that afternoon. No-shows for the next day become available at 2 pm.