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Mt. Diablo Summit Loop - South



16.0 mile 25.8 kilometer loop
80% Runnable


Ascent: 3,679' 1,121 m
Descent: -3,678' -1,121 m
High: 3,725' 1,135 m
Low: 616' 188 m


Avg Grade: 9% (5°)
Max Grade: 34% (19°)


No Dogs
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Trail shared by Ryan Fanning

A long loop run through Mt. Diablo Foothills and to the summit of Mt. Diablo.

Ryan Fanning

Features Spring · Views · Wildflowers

Dogs allowed on some trails but not on others.


A great long loop through the Mt. Diablo foothills and all the way to the summit. There are some very steep sections, particularly on the descent. Little rest for the weary on this run—almost every section is uphill or downhill and the flat sections are few and far between here.

Need to Know

There are ticks, rattlesnakes, bobcats, and mountain lions in this area. I personally had to brush off a few ticks after going through long grass, and saw a bobcat run across the trail about 20 ft. in front of me (also had a turkey hanging out on the trail for a bit).


This is a tough, long loop starting in the foothills and taking you to the summit of Mt. Diablo. Incredible views are available at almost every point along the way. Despite the heavy rains in early 2017, the trails are mostly in good shape.

You take Wall Point Road to the Summit Trail. The Summit Trail will briefly become Green Ranch Road, and then rejoin Summit Trail. The entire Summit Trail is a moderate uphill with some steep sections. There are very few flat sections or descents, with the exception of parts of the rolling foothills, primarily on Wall Point Road prior to the Summit Trail.

Once you reach the summit, turn back down the Summit Trail, across the upper parking lot to the South Juniper Trail. Proceed down Juniper to Deer Flat Fire Road. Then, take Burma Road to Angel Kerley Rd to Little Pine Creek Trail to Stage Road Trail. From Stage Road Trail, turn down the BBQ Terrace Road back to Wall Point Road, which you can follow back to the parking lot. There are some seriously steep downhill portions here. Many of the downhill sections have loose gravel/rocks, so careful footing is required.

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Dec 28, 2019
Jacob Klinker
Bit muddy from recent rain, but trail is in good shape overall. 15mi — 2h 45m
Mar 3, 2018
Isley Gao
16mi — 5h 00m

Trail Ratings

  4.8 from 8 votes


  4.8 from 8 votes
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Run Rankings


in California


155 Views Last Month
4,809 Since May 15, 2017



Summit Trail
Oct 22, 2017 near Blackhawk, CA
Diablo Summit observation deck lookout
Oct 22, 2017 near Blackhawk, CA
Wall Point
Oct 22, 2017 near Diablo, CA
Summit Trail
Oct 22, 2017 near Blackhawk, CA
We only saw 2 other people on our Monday hike on the North Juniper Trail!
Feb 4, 2016 near Blackhawk, CA
The route is well-kept and exposed, with sweeping views and occasional brisk gusts — especially close to the summit.
Sep 30, 2018 near Clayton, CA


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