Gates open 8:00am and close at sunset. Visitors should plan to be in their vehicles by sunset and headed out to avoid being locked in.

Can you drive up Mt Diablo at night?

If you want to go right up to the summit, you have to get out before 8:30 pm (sunset; from memory, in summer) since they close the gates to that part for the night. But there are camping sites at the lower reaches (which are still on the mount and promise fine views) which are accessible all the time.

How much does it cost to get into Mount Diablo State Park?

Both routes provide access to the summit and require a $10 entrance fee per vehicle. Another option is to enter through the Mitchell Canyon Staging Area or the Macedo Ranch Staging Area; parking only costs $6 here, but there is no driving access to the summit.