Intermediate mountain bike ride. Good fitness required. Suitable for all skill levels. The starting point of the route is right next to a parking lot.

Last updated: June 26, 2025

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Waypoints

Start point

Parking

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351 m

Old Borges Ranch

Still operating, mostly as an open air farming museum.

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2.75 km

Mammoth Rock

Pine Valley opens up for great views of the tall carst rock outcrops.

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2.84 km

Sandstone caves in Castle Rock formations

Water, wind, and calcite erosion in per-volcanic sandstone formation.
Slightly acidic rainwater seeps into the sandstone during winter rains and dissolves some of the calcite. Warm and dry days cause …

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6.01 km

Wall Pt. Road

Wall Point Rd is one of the best fire roads for riding in the area. It has excellent views of Mt Diablo, Las Trampas, San Francisco, Mount Tamalpais, and the …

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7.99 km

China Wall

This sandstone stratum has eroded over time and created this natural wonder that looks very similar to the Great Wall of China.

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8.69 km

Briones to Mount Diablo Regional Trail

Gravel at its best. This road is a paradise for gravel bikers and novices on a mountain bike.

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10.5 km

Twin Ponds

Two small ponds, mostly dry by summer, at the junction with Borges Ranch Trail. They fill again with the winter rains and last through spring and early summer. They are dry in late summer and fall.

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13.5 km

Costanoan Trail

This trail offers a spacious and easy-to-follow path. From here, you'll be able to enjoy a stunning view of Mt. Diablo and the rolling hills in the area. Keep in …

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14.9 km

End point

Parking

Way Types & Surfaces

Way Types

13.4 km

1.10 km

373 m

Surfaces

8.80 km

5.68 km

288 m

< 100 m

Elevation

Highest point (270 m)

Lowest point (120 m)

Weather

Friday 17 October

25°C

11°C

0 %

If you start your activity now...

Max wind speed: 4.0 km/h

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This route was planned by komoot.

Diablo Foothills Regional Park loop — Walnut Creek

Old Borges Ranch

Mammoth Rock

Sandstone caves in Castle Rock formations

Wall Pt. Road

China Wall

Briones to Mount Diablo Regional Trail

Twin Ponds

Costanoan Trail

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