Run the Mt. Diablo Foothill Loop

San Francisco Castle Rock Regional Recreation Area

Added by Kim Suarez

This is a great 10k for those of you looking to get some trail running experience. There is a lot of climbing, but the views are worth it! This trail winds up and down beginning at Castle Rock staging area in Walnut Creek and ascends through the Mt. Diablo Foothills.

Continue by car down Castle Rock Road until it dead ends at the beginning of the trail. Parking is usually easy to find. If full, there is another overflow lot about 500 ft back the way you came in.

You'll walk a good half mile down the trail before getting the main gate. As you're walking, you'll see a swimming pool, baseball diamond, volleyball courts, basketball courts, restrooms and picnic tables. Begin the 10k at the gate just past the picnic tables.

You will travel down Stage Rd. about 1.5 miles until you see Sunset Trail on your left. Keep an eye out because it's easy to run past. Make a sharp left and you'll find yourself on single track trail winding up through a narrow valley.

Once at the top of the single track, take a left and descend into another valley. Conserve your energy because a climb is coming up! Rest on the downhill immediately after and you'll find yourself in another valley.

You should be on Little Pine Creek Rd. as you ascend the final and largest ascent of the run. Stay to the left as the trail also veers off to the right. At the top, you'll begin your final descent back to Stage Rd. Catch Burma Road down to the right to start looping back down.

Once back to Stage Road, you'll need to turn left for about 0.25 miles before making a U-turn and heading back down Stage Road to the starting point.

Congratulations on crushing a challenging 10k!

Pack List

If you plan to run:
  • Cell Phone
  • Water
  • Trail Map
  • Trail running shoes
If you plan to hike, bring all of the above including:
  • Day Pack (snacks, first aid kit, bug spray, compass, whistle, flashlight)
  • Comfortable hiking shoes
  • Layers as the weather can change depending on time of day and elevation
  • Camera
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Fitness, Hiking, Mountain Biking, Photography, Running

Skill Level:




Trail Type:



6.2 Miles

Elev. Gain:

875 Feet



Dog Friendly
Easy Parking
Family Friendly
Picnic Area

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How to Get There

2 months ago

Shaded, Limitless Trails. What's Not To Love.

So many things to do at Castlerock foothills. Trail running or biking down Stage road is great. Shaded so it's nice most anytime of the day. Quick out-and-backs are good, or you can add onto your mileage and adventure by adding loops that all connect like Wall Point, Little Yosemite (hiking only) and others. You can peel off and rock climb and Boulder rocks which adds a fun level of fitness to your hiking or running. Lots of nice nature to look at, and the trail follows and intersects a creek several times. Depending on season it will have water in it.

2 months ago

Added by Kim Suarez

Day job in fashion, outdoor explorer on the weekends. San Francisco-based but I try to leave the city and explore the surrounding areas every weekend.

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