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Cobblestone Mountain


Location: Ventura County, about 15 miles south of Gorman, 85 miles from Los Angeles


Auto Club: Ventura County
Forest Service: Los Padres National Forest: Mt Pinos, Ojai and Santa Barbara Ranger Districts
Topo: Cobblestone Mtn 7½, Black Mtn 7½, Alamo Mountain

Nearby Peaks: Alamo Mountain, McDonald Peak, Sewart Mountain, Snowy Peak, Black Mountain #2, White Mountain #2


(USFS Adventure Pass Required)
Distance: 14 miles r.t. on road, trail and step, loose cross-country
Gain: 5200 feet total, 2700 feet going plus 2500 feet on the return
Time: 8-10 hours r.t.
Rating: Class 2, Very Strenuous
Navigation: Difficult
Leader Rating: "I"

Original: W. E. von Pertz, January 1974


  • Go north on I-5 to the town of Gorman. Get off on the signed Gorman exit.
  • Turn left at the bottom of the off ramp and go under the freeway.
  • Go 0.1 miles to Peace Valley Road. Turn right.
  • Go 1 mile to the entrance to Hungry Valley Recreation Area on your left (paved). Turn left. If the entrance station is manned, you can avoid payment of the fee by telling the State Park employee that you are passing through to Alamo Mountain. Note your odometer and go as follows:
  • At 7.8 miles, intersection. Turn right (west) toward "Piru Creek", signed.
  • At 12.2 miles, improved car camping area on right, with toilets. Often used as a meeting point.
  • At 12.4 miles, Piru Creek Crossing. There is a seasonal gate just past this stream crossing.
  • At 14.4 miles, the pavement ends.
  • At 18.8 miles, fork to the left. Keep right.
  • At 18.9 miles, junction with the Alamo Mountain Road. (To the right leads to Twin Pines Campground and Alamo Mountain Route 2.) Turn left. Note your odometer again and go as follows:
  • At 3.3 miles, fork immediately beyond a small road cut through the ridge. (To the right leads to Alamo Mountain Route 1.) Turn left.
  • At 4.0 miles, the road continues east at the Little Mutau trailhead. Past this point the road can sometimes be poor but usually passable.
  • At 6.3 miles, the parking spot for McDonald Peak.
  • At 7.2 miles, an iron pipe gate and a large parking area, suitable for car camping. Park here.


  • From the parking area (6,500') pass the gate and hike east on the old road for one mile to the obvious high point of the road. This is the summit area of Sewart Mountain.
  • Continue downhill on the old road for about 0.5 mile to a fork with an obscure road on the right, signed "Sespe Wilderness". Turn right onto this road (continuing straight leads to Snowy Peak and Black Mountain #2).
  • Follow this overgrown road as it first descends steeply south to a saddle, turns east over bump 6,043', then proceeds downhill in roller-coaster fashion.
  • After about 2.5 miles the overgrown road turns to trail. Follow the trail eastward onto the northern slopes of a forested ridge, looking for a side trail coming steeply in from the right, possibly signed "Cobblestone Trail".
  • Turn right on this side trail, which is very deteriorated and should be considered cross-country travel.
  • Take this old trail as it goes southeast up a ridge. After a long half mile it comes to a fork in a shallow saddle with the remains of a sign (5,840'+). Continuing straight along the ridge goes to White Mountain #2. Cobblestone Mountain can be seen directly to the south.
  • Take the right fork and follow an overgrown, rough trail down through a saddle (5,300'). Beyond the saddle the trail is primitive, with occasional ducks, and is essentially cross-country. It passes first through a break in the large buttress south of the saddle, then ascends steeply to and then through a series of loose steps composed of conglomerate rocks that give the peak its name, and finally exits onto forested slopes near the summit. The summit has a very fancy register box.


Cobblestone Mtn is often combined with White Mountain #2. This hike is 16 miles r.t. and has 6,500' gain.

The peak is in the Sespe Wilderness, but wilderness permits are not required at this time.

Contact the USFS at (661) 245-3731 for information about the status of the seasonal gate at the Piru Creek crossing.

History of Summit Signature

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Hundred Peaks Section, Angeles Chapter, Sierra Club
Published 23-Jun-2002
© 1998-2002 - All Rights Reserved

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