Sibley Volcanic Trail Labyrinths
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About this place
Not only does this hike along Sibley Volcanic Regional Park's Volcanic Trail lead to multiple hidden labyrinths, but it is also at the site of an ancient ocean and volcano! A volcano existed here about 10 million years ago. It erupted and formed Round Top Peak, which you can now hike to. Also, years of quarrying have exposed ancient bedrock and a valley where one of the labyrinths exists.
From Skyline Blvd, pull into the staging area for Sibley Volcanic Regional Preserve, you'll see the sign. Parking here is usually easy to find. You'll find an unstaffed visitor center with a restroom, park maps and informational displays featuring the history and geology of the park.
Sibley is a 31-mile trail system, leading along the ridgeline between Wildcat Canyon and Anthony Chabot Park.
From the parking lot, head up the Skyline Trail to Round Top Loop trail. Proceed on Round Top Loop heading clockwise (left) on the loop. From the Round Top Loop, head left on the Quarry Trail. The Quarry Trail will hit the Volcanic Trail shortly thereafter. Take the Volcanic Trail toward spot 6 on the park map (download from the East Bay Parks website) or follow the GPX track. To return, head back the way you came.
This is a short hike, only ~2 miles total, but there are no water fountains along the way, only at the visitor center.
Leave No Trace
