Hanna Grove Trail, Costanoan Trail, and Briones Trail Loop

Starting from the Springbrook Lane trailhead, this scenic loop follows the Hanna Grove, Costanoan, and Briones trails through the rolling hills of Shell Ridge Open Space. Along the way you'll hike across open grasslands, oak-studded hillsides, and scenic ridgelines, with expansive views of Mount Diablo, Walnut Creek, and the surrounding Diablo Foothills.

This 4.5-mile loop features 843 feet of elevation gain, making it a rewarding moderate hike with a mix of steady climbs and panoramic viewpoints. The route combines three of Shell Ridge's signature trails into one memorable adventure, offering peaceful backcountry scenery, abundant wildlife, and colorful wildflowers in the spring.

Source: Trail information adapted from AllTrails.