Air Force One Loop, 10mi

Rate this Adventure San Francisco Mount Diablo

Added by BayTrailrunners

  • Distance: 10 miles
  • Total elevation gain: 3781 ft
  • Single track, fire road, hills

Mt. Diablo is the sentinel peak of the East Bay, offering beautiful, varied ecology and stunning views of the entire Bay Area. And no matter what anyone else tells you there is no better way to experience this magical place than by running Air Force One (AFO). This loop is not for the faint of heart, however, as it is one of the most difficult sustained runs we do. Be alert for mountain lions and rattle snakes, poison oak and ticks. Be cautious of sprains and falls, as bailing out is tricky at many places. Bring lots of water and a sense of adventure. And once you're done you will not regret it: this will be a run by which you measure all others.

The run begins by dropping into the creek bed at the end of the road. The Donner Creek fire road is well used and clearly marked. Follow it South toward the mountain, remaining on the fire road as it turns East and begins to climb steeply up the face. Tough out the climb until you come to the start of the Olympia Trail, about 2 miles into the run. Follow the Olympia trail East, alternately traversing and climbing. You will be exhausted by mile 3, but keep an eye out for the easily-missed singletrack Zippe Trail, which attacks Mt. Olympia directly. Hang in there-you're almost done the main climb! From the height of Mt. Olympia (2800 ft.) you can begin to loosen up. Follow the small rocky singletrack North Peak trail South along the ridge, grinning the whole way as you take in the views. Keep on the technical trail as it climbs again to merge with the North Peak fire road. Follow the road to the right (Southwest) for ~1 mile until the major trail junction. Here is where the really fast and fun part starts. Pick up the clearly-marked Bald Ridge singletrack trail and follow it all the way along the ridge-over rocks, roots, trees, and drop-offs. At the next junction continue heading Northwest on the Eagle Peak trail. Follow Eagle Creek all the way along the ridge over rocks and ledges, taking in views of the Bay the whole way. The trail will drop you sharply back into the valley at the end of about 3 miles. Take the Murchio trail East for about half a mile then head North across the meadow back to the car once the houses come into view. Source

Pack List

  • Running gear
  • Water for sure!
  • Sun block
  • Snacks
Read More



Fitness, Running

Skill Level:



Year Round


Easy Parking

Are we missing something?

Suggest an edit

How to Get There

Have you done this adventure? Have something to add? You could be the first to leave a review!

Added by BayTrailrunners

We are a homegrown, grassroots running community that was founded locally in the foothills of the Santa Cruz Mountains and the Marin Headlands. We meet regularly for fun, noncompetitive and social group trail runs in and around the San Francisco Bay Area. There is no cost to join! Check the calendar, bring a friend, and enjoy some of the best trailrunning on the planet!

More Adventures Nearby

Run Sawyer Camp Trail

San Francisco / Sawyer Camp Trail

The Sawyer Camp Trail is a popular paved trail that stretches alongside the Crystal Springs Reservoir all the way to Hillcrest Blvd.

Rachel Davidson
12 Saves

Run the Circumnavigation of Redwood Regional Park's Ultimate Trail Loop

San Francisco / Redwood Regional Park

It’s difficult to have a car in San Francisco, but oh-so worth it when it comes to weekend getaways, especially with all the Bay Area has to offer.

Rachel Davidson
9 Saves

Camp at Mare Island Shoreline Heritage Preserve

San Francisco / Mare Island Shoreline Heritage Preserve

This old Naval Base is now home to, well, almost nothing.

Natalie O'Connor
18 Saves