Shell Ridge is the City of Walnut Creek's largest open space unit, with trails for biking, hiking and riding through oak woodlands and grassland savannah on the lower flanks of Mount Diablo. Shell Ridge gets its name from the marine fossils left behind when the ocean waters that once covered the area receded.
Rajesh M. on Shell Ridge - Borgess Ranch Loop
Avoid in rainy days.
Viral D. on Shell Ridge - Borgess Ranch Loop
Good trail. Decent hike. Scenic. Avoid if it rained recently or if you are going to do it anyway, make sure you wear good trekking shoes. It was muddy when we visited as it rained on three previous day.
Kovar trail is mostly uphill and then you drop down into Indian Valley and head back uphill to Ridge Trail. It's a great hike/run if you're training hills but not much shade so plan for that. All the uphill is worth it because running on top the hill on Ridge trail is really cool.