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** Use at Your Own Risk **
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 Topos | Borrego Palm Canyon 7½, Tubb Canyon 7½ |
| Official HPS Maps | TPO file - Save to your computer then open with National Geographic TOPO! |
| Viewable JPG file - Approximately 740K | |
| GPX file or Google Earth KML file to download to GPS units and other map software (How to use GPX and KML files) | |
| Routes as shown on CalTopo using the above files (How to use CalTopo) |
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.
ROUTE 2
- Distance: 4-5 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 the good dirt 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 jeep road in a southeast direction to a saddle.
- Leave the road at the saddle to avoid private property down the road. Walk across a flat area toward a gully, staying low enough to avoid brush.
- Ascend the gully on the west side of The Thimble.
- When the gully becomes brushy, pick a path through the brush to the peak. The route is lightly ducked.
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
Climbing Archives
Please report any corrections or changes to the Mountain Records Chair.