The Black Mountain Trail

The peninsula's biggest hill climb

Length 9.7 mi · Climbing 2420 ft
California > San Francisco Bay Area > Rancho San Antonio Open Space Preserve

The one level section of the Black Mountain Trail


This is the most difficult of the many routes that climb Skyline Ridge, and one of the more challenging 10-mile hikes on the peninsula. The elevation change isn't actually all that big for a hike of this length, but the long climb that gets progressively steeper toward the end has a way of wearing you out.

The trail is very popular and on a nice summer day you might encounter a group of hikers every five minutes or so. There's an unusual variety of people here, with young and old, hikers and joggers, individuals and families, and a whole lot of Silicon Valley engineers all puffing their way to the top. The route seems to be a favorite of hiking clubs and other big groups.

The trail is really quite enjoyable; it features some very nice woodland as well as sweeping views of the Bay Area. No other trail has better views of Silicon Valley. There's no traffic noise and few trail intersections, and much of the route is very well-maintained singletrack. The trail is mostly wooded, but there's a long stretch of chaparral at the top.

Despite being wooded, the lower portion of the trail gets very hot in the summer. The hike should be avoided if the high temperature for the day is forecast to be 85F or higher.


Click map to show all roads and trails
Part of the Bay Area Trail Map: Skyline Ridge (Redwood Hikes Press, 2013)

Hike description

Click here to see the trailhead location in Google Maps.

The hike begins at a secret little parking lot that isn't shown on the official park map. It's on Rhus Ridge Road, off Moody Road a mile west of Highway 280. The lot is unsigned and not easy to find, but it only has about ten spaces and fills up quickly, especially when large groups show up. If the lot is full, park on the shoulder of Moody Road near Bledsoe Court; this adds 0.6 miles to the round-trip hike.

From the parking lot, a dirt road enters the woods, leads past a seedy-looking "caretaker's house" with a horse corral, and then begins to climb steeply. After about a half-mile the first scenic view of the Bay Area appears. Even at this low altitude the trail has a pretty good view over Los Altos Hills.

The first mile of the trail features views of Los Altos Hills

At about one mile the road crests, entering an isolated, wooded valley. At this point there's a 4-way intersection; turn right onto the wide singletrack trail. The singletrack is about a mile and a half long and is the best part of the hike. At first, the wide, well-groomed trail gives you a bit of a rest, remaining level as it winds around a canyon. After the Hostel Trail intersection, the trail narrows and begins to climb at a moderate grade through open woods. From time to time the trail passes through patches of chaparral with nice views of Rancho San Antonio's heavily-wooded ridges. The woods are mostly oak and bay laurel; the groundcover includes abundant small ferns, which is somewhat surprising in an area that's so warm in summer.

At about 3.5 miles the singletrack trail changes to a dirt road originally built for power line maintenance. At the same time, the woods end and the trail begins climbing through sunny chaparral. The dirt road is also a lot steeper than the singletrack. However, this stretch has the best views of the hike, with sweeping vistas of the South Bay and up the peninsula to San Francisco. Also, although the dirt road isn't as pleasant as the singletrack, it does add some variety to the hike.

Reaching an antenna farm and a T intersection, turn right, then turn left onto Monte Bello Road. Climb the last few yards to the peak of Black Mountain, which is really more of a wide, gently-sloping rise. There's a cluster of small rocks and, for the first time, views of the rolling golden hills to the west with the conifer-clad Butano Ridge in the distance. There isn't much of a view of Silicon Valley from the peak; the views along the way are better.

The Black Mountain Trail

Similar hill climbs in the Bay Area

  • The Kennedy Trail in Sierra Azul Open Space Preserve has 2020 feet of climbing in an 8-mile out-and-back. It starts just outside Los Gatos, and like Black Mountain it's essentially one continuous climb. There are, however, a lot fewer people. On the negative side, the Kennedy Trail is all chaparral, lacking the pleasant woodland of Black Mountain.
  • For a more challenging hill climb, check out the Ohlone Wilderness Trail in Del Valle Regional Park. An out-and-back hike to the top of "Big Burn" results in 3800 feet of climbing in a 10 mile round-trip, but the trail goes on a lot further.

More information

The fire road section near the top of the trail has the hardest climbing but the best views


© 2010, 2012, 2013 David Baselt