Published permit statement
The ReserveAmerica overview states that a permit is required on portions of the trail.Evidence and sources (1)
Evidence stance: supports · Evidence details
The page calls Del Valle the eastern gateway to the Ohlone Wilderness Trail, describes the trail as 28 miles connecting to Sunol and Mission Peak, and states that permits are required on portions and may be purchased at the park entrance kiosk; it separately states that backpack reservations remain available.
Observation details · Source details · Original source: ReserveAmerica / East Bay Regional Park District