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Castle Rock Recreation Area – Mammoth Rock loop from Diablo Foothills Regional Park

Routes

Running trails & routes

United States

California

Contra Costa County

Castle Rock Recreation Area – Mammoth Rock loop from Diablo Foothills Regional Park

Moderate

4.8

(7328)

19,920

runners

Castle Rock Recreation Area – Mammoth Rock loop from Diablo Foothills Regional Park

00:58

8.11km

100m

Running

Moderate run. Good fitness required. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is right next to a parking lot.

Last updated: April 2, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Mount Diablo State Park

Waypoints

Start point

Parking

Get Directions

1.53 km

Sandstone Formations With Holes, Diablo Foothills Regional Park

Highlight • Natural Monument

The rocks in that area are made of sandstone. During our winter rains, acidic rain water seeps into and sits in the rocks. The next summer, the dry heat pulls …

Tip by

2.22 km

Castle Rock Recreation Area

Highlight • Climb

The Castle Rock formations are a popular destination for local rock climbers in this scenic canyon along Pine Creek, with Mammoth Rock the largest. The prominent sandstone amid the oak …

Tip by

2.24 km

Mammoth Rock

Highlight • Natural Monument

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

Tip by

2.33 km

Sandstone caves in Castle Rock formations

Highlight • Cave

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 …

Tip by

2.37 km

Stage Road

Highlight (Segment) • Trail

Located in Diablo Foothills Regional Park, the area is popular with rock climbers. ebparks.org/parks/diablo_foothills

Check out my Little Yosemite Trail tour for more pictures of the area.
komoot.de/tour/4100005

Tip by

4.05 km

Pine Pond

Highlight • Lake

This little pond is really more like a bog, but it is a good marker along the trail, as you pass it right by the junction with Little Pine Creek/Burma Road and Stage Road.

Tip by

8.11 km

End point

Parking

Way Types & Surfaces

Way Types

7.69 km

387 m

Surfaces

5.61 km

2.44 km

< 100 m

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Weather

Today

Sunday 17 May

26°C

9°C

0 %

Additional weather tips

Max wind speed: 29.0 km/h

to get more detailed weather forecasts along your route

Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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Castle Rock Recreation Area – Mammoth Rock loop from Diablo Foothills Regional Park

Sandstone Formations With Holes, Diablo Foothills Regional Park

Castle Rock Recreation Area

Mammoth Rock

Sandstone caves in Castle Rock formations

Stage Road

Pine Pond

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