Mount Diablo Professional Review and Guide
"Mount Diablo, at 3,849 feet, dominates the San Francisco Bay Area. Because of its isolated position, it provides sensational views of the surrounding territory—provided it isn’t foggy or smoggy. On a clear day in winter or early spring it is possible to see Mount Lassen, 165 miles to the north. The mountain has extensive recreational developments, including three campgrounds, numerous picnic areas, and miles of trails. The park is at its best in spring, when things are green, the birds are singing, and the wildflowers are blooming, although the winters are also very pleasant. Specialty birds: Resident—Golden Eagle; Prairie Falcon; Western Screech-Owl; White-throated Swift; Nuttall’s Woodpecker; Hutton’s Vireo; Oak Titmouse; Rock Wren; Western Bluebird; Wrentit; California Thrasher; Rufous-crowned and Sage Sparrows; Lesser Goldfinch. Summer—Common Poorwill; Pacific-slope and Ash-throated Flycatchers; Black-chinned Sparrow; Black-headed Grosbeak; Lawrence’s Goldfinch. Winter—Varied Thrush. Migrant—Hammond’s Flycatcher. This eTrail provides detailed information on birding strategies for this specific location, the specialty birds and other key birds you might see, directions to each birding spot, a detailed map, and helpful general information."