Sentinel Dome in Yosemite National Park is visible, but Half Dome is hidden by the 8000-foot ridge at 37.755N 119.6657W. Lassen Peak, 181 miles (291 kilometers) away, is occasionally just visible over the curve of the earth. The best views are after a winter storm a snowy Sierra shows up better, and summer days are likely to be hazy. On a clear day, the Sierra Nevada range is plainly visible from the summit.

The day use fee per vehicle for the park varies according to the entrance: $6 via Macedo Ranch (Alamo) or Mitchell Canyon (Clayton), and $10 via South Gate Rd. These include 38 preserves, such as nearby city open spaces, regional parks, and watersheds, which are buffered in some areas with private lands that have been protected by conservation easements. According to the non-profit Save Mount Diablo, there are now varied types of protected lands on and around Mount Diablo that total more than 90,000 acres (36,000 ha). The state park was the first public open space established on or near the peak. The peak is in Mount Diablo State Park, a state park of about 20,000 acres (8,000 hectares). Road access is via North Gate Road or South Gate Road. The summit is accessible by foot, bicycle, or motor vehicle. 7.1 Mount Diablo Challenge bicycle race.

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