Mt Diablo State Park Extended Loop is a 27.6 mile moderately trafficked loop trail located near Clayton, California that offers the chance to see wildlife and is rated as difficult. The trail offers a number of activity options.

Length27.6 miElevation gain6,847 ftRoute typeLoop
HikingMountain bikingNature tripsBird watchingRunningViewsWildlifeNo dogs
Waypoints (0)
Weather
UV Index
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Reviews (15)
Photos (5,084)
Activities (15)
Completed (34)
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Albert Gussmann
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Hiking

Beautiful trip the a range of terrain, the length makes it the only hard part about the trip :)

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Albert Gussmann
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Hiking

Great trail gets the blood pumping!!! wear good boots/ shoes it can get a bit rough

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E C
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Hiking

Magnificent. Lace up and relish the views!

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Manuel Hernandez
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Running

I really liked this loop, but I was not able to finish it as I ran out of battery on my GPS.

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Nic Wilson
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Hiking

The first 9 miles is great! The last 18 is very open and exposed. The last uphill is very steep also, which is tough 20 miles in.

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Kurt P
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Hiking
First to Review

A challenging hike that explores the diversity of Mt Diablo. Bring plenty of water (4L) or a filtration kit; you can only refill at the South Gate camp ground. Lots of exposure so start very early to avoid heat and complete before dark. Hiking poles recommended as legs will be tired at the end. Please post your experience with this hike when you’re done. Safe hiking!

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Matan Iarovici
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Hiking
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Troy Cole
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Hiking
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Oliver Gessner
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Hiking
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Eugene Ibanez
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Hiking
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Oliver Gessner
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Mountain biking
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Eugene Ibanez
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Hiking
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Eugene Ibanez
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Hiking
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Orlando Gutierrez
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Hiking
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Dan T
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Hiking
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