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See the Retired Peak Guides in the Archives for Microsoft Word and other versions of this peak guide.

31I

San Ysidro Mountain

6147'

San Diego County, about 9 miles west of Borrego Springs, 137 miles from Los Angeles

Maps

Auto Club: Riverside County, San Diego County
Forest Service: Cleveland National Forest
USGS Topo: Borrego Palm Canyon 7½, Tubb Canyon 7½
HPS: Route(s) using National Geographic Topo! software
PDF version (approximately 764K)

Printable version of this route

ROUTE 1

Distance: 10 miles round trip cross-country
Gain: 3200' total, 2600' out plus 600' on return
Time: 6-8 hours round trip
Rating: Class 1, strenuous
Navigation: Difficult

Original: Alan Coles

DRIVING ROUTE 1

  • Take I-15 south to Temecula.
  • Take the second off-ramp for SR 79, signed "79 South / Indio". Turn left (east) on SR 79 for 37 miles to the town of Warner Springs.
  • Continue south of Warner Springs on SR 79 for 3.5 miles to a junction with S2 coming in from the left. Turn left onto S2.
  • Drive southeast 4.7 miles to S22. Turn left.
  • Drive east on S22 for 6.6 miles to the Anza-Borrego State Park Boundary, which is signed at the top of a rise in the road. Park on the road shoulder just past the rise at the end of the fence on the left side of the road.

HIKING ROUTE 1

  • From the parking area (4200'), head north up the ridge, parallel to the fence but eventually veering northeast, following openings through cholla and scrub brush.
  • Within a mile of the highway, the fence takes about a 1/4 mile jog to the east. When you meet this east-west fence portion, turn east around the fence corner, ending up about 1/4 mile south of a prominent formation known as Chimney Rock. Head north past this rock and the next bump on their east sides.
  • Then go north up a ridge and over bump 5326', which has a register on top ("White Benchmark").
  • Continue north from White BM through moderate to heavy brush along the east side of the Thimble.
  • Upon meeting a major gully about 0.2 mile to the northeast of the Thimble, turn west and ascend the gully to the saddle at its head.
  • From the saddle, go north up brushy slopes to the summit.

Printable version of this route

ROUTE 2

Distance: 4 miles round trip cross-country
Gain: 1500' total
Time: 2-3 hours round trip
Rating: Class 1, strenuous
Navigation: Difficult

Original: Wayne Bannister, December 2012

DRIVING ROUTE 2

  • Take I-15 south to Temecula.
  • Take the second off-ramp for SR 79, signed "79 South / Indio". Turn left (east) on SR 79 for 37 miles to the town of Warner Springs.
  • Continue south of Warner Springs on SR 79 for 3.5 miles to a junction with S2 coming in from the left. Turn left onto S2.
  • Drive southeast 4.7 miles to S22. Turn left.
  • Drive east on S22 for 5.4 miles to Lease Road. Turn left.
  • Drive 1.5 miles north on Lease Road. Just past Jack Ass Road, turn right onto a dirt road.
  • Drive 0.5 mile until you reach an Anza-Borrego boundary sign. Park here. The dirt road to the right is private property.

HIKING ROUTE 2

  • From the parking area (4500'), head north up a broad canyon on a dirt road and use trail.
  • After approximately 0.7 mile, reach a steep gully. To the right of the gully is a dirt road between Prospects Peak (5685') and 5035'. Turn onto the dirt road.
  • Follow the the jeep road in a southeast direction over the saddle until you reach a flat open area.
  • The flat open area leads into gully on the west side of The Thimble. Go north in the gully on a ducked route to the peak. Stay within in the park boundaries defined by a fence.

NOTES

San Ysidro Peak lies within the Anza-Borrego State Park, but no fee is required when parking along the shoulder of paved road S22.

History of Summit Signature

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Hundred Peaks Section, Angeles Chapter, Sierra Club
Published 18-July-2013
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