The weekly lottery for 60% of each trailhead's daily quota, 24 weeks ahead of the trip.
Yosemite's own wilderness permits page says reservations are required from late April through October, that permits are limited per trailhead, and that 60 percent of each trailhead's daily quota becomes available by lottery 24 weeks in advance. Per-trailhead quotas are on the park's trailhead information page.
Updated , checked by hand against the target's own page.
No upcoming date is published yet. A watch here alerts you only once a date is recorded on this page.
More openings to watch in California
Watched from nps.gov, the target's own public page — not a reservation system we poll.