Fossil Hill, Ginder Gap, Ridge Top to Summit Ridge Trail

Starting from the Marshall Drive entrance, this scenic loop follows Fossil Hill, Ginder Gap, Ridge Top, and Summit Ridge trails through the rolling hills of Shell Ridge Open Space. Along the way you'll hike across open grasslands, oak woodlands, and scenic ridgelines, with sweeping views of Mount Diablo, Walnut Creek, and the surrounding Diablo Foothills.

This 4.2-mile loop features 790 feet of elevation gain, making it a rewarding moderate hike with a mix of steady climbs and panoramic viewpoints. The route combines several of Shell Ridge's signature trails into one memorable adventure, offering diverse scenery and excellent opportunities to spot wildlife and seasonal wildflowers.

Source: Trail information adapted from AllTrails.