Round Top Loop Trail

Sibley Volcanic Regional Preserve, California 94507

Distance1.3mi
Elevation Gain635ft
Trailhead Elevation1,479ft
Top1,625ft
Elevation Min/Max1461/1625ft
Elevation Start/End1479/1479ft

Round Top Loop Trail

Round Top Loop Trail is a hiking, biking, and horse trail in Contra Costa County, California. It is within Sibley Volcanic Regional Preserve. It is 1.3 miles long and begins at 1,479 feet altitude. Traveling the entire trail is 2.6 miles with a total elevation gain of 635 feet. The Mazzariello Labyrinth attraction can be seen along the trail. There is also a picnic site along the trail. This trail connects with the following: Bay Area Ridge Trail and Volcanic Trail.

Round Top Loop Trail Professional Reviews and Guides

"An easy circumnavigation of Round Top peak features lovely views of San Francisco Bay and Mount Diablo and interesting insights into the geology of a long-extinct volcano. The gentlest volcano you’ll ever hike, Round Top distinguishes itself from neighboring heights in the Oakland and Berkeley hills by virtue of its fascinating geological history. The volcano was a cauldron of activity about ten million years ago, when it spewed the various lavas (tuffs, basalts, breccias) that underlie the current landscape. Pressure from nearby earthquake faults have lifted and twisted the old volcano over the eons, exposing its innards for the education and enjoyment of scholars and hikers alike. The Round Top Loop Trail skirts the summit of the peak."

"This volcanic nook in the Berkeley and Oakland hills is alive with geologic hints to the operation of an ancient volcano. About 9.5 million years ago, Round Top was the center of a great volcanic cauldron. Over time, the outside of the volcano eroded, leaving the center exposed. Faults folded the volcano on its side, exposing the entire vent system. The main vent of the ancient volcano, as well as basaltic dikes, lava flows, and red-baked cinder piles can be seen along the Volcanic Trail. The hike is easy, along wide trails that climb gently. The route explores some volcanic deposits, then circles the core of the volcano before descending into the woods. There are good views to the east of Mount Diablo and the foothills, and to the north and south of endless rolling hills. Numbered signposts correspond with a trail guide available at the visitor center. Park activities include walking, horseback riding, and biking. No fee is charged."

"This ramble around a long-extinct volcano features lovely views of San Francisco Bay and Mount Diablo and offers interesting insights into the Bay Area’s volatile geology.

The gentlest volcano you’ll ever hike, Round Top distinguishes itself from neighboring heights in the Oakland and Berkeley hills by virtue of its fascinating geological history. The volcano was a cauldron of activity about ten million years ago, when it spewed the various lavas (tuffs, basalts, breccias) that underlie the current landscape."

Round Top Loop Trail Reviews

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7/16/2006
A short drive to get out of the congested bay area is one of the best reasons for this trip. It was a pretty spot with good views of the rolling hills to the east. It wasn't all that scenic but for a quick easy walk that just about anybody can do I'd say go for it.
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Trail Information

Sibley Volcanic Regional Preserve
Nearby City
Sibley Volcanic Regional Preserve
Parks
Dog-friendly
Accessibility
East Bay Regional Park District, 2950 Peralta Oaks Ct., PO Box 5381, Oakland, CA 94605-0381; (888) EBPARKS; www.ebparks.org
Local Contacts
USGS Oakland East; East Bay Regional Park District map and brochure available at the trailhead and online at www.ebparks.org
Local Maps

Activity Feed

Jul 2018