Page Type Page Type: Mountain/Rock
Location Lat/Lon: 33.24719°N / 116.49765°W
Additional Information County: San Diego
Activities Activities: Hiking, Scrambling
Seasons Season: Spring, Summer, Fall, Winter
Additional Information Elevation: 5779 ft / 1761 m
Sign the Climber's Log


The Thimble is located in the San Ysidro Mountains in northeastern San Diego County. It is located near White BM and San Ysidro Mountain
There is a nice class 3 scramble required to reach the top. From the summit you can see most of Eastern and Central San Diego County including many SDC peaks. This peak offers some fine scrambling from any side. The North Face may also offer more technical routes.
The Thimble North Face

The North Face

The route starts right after the sign for Anza Borrego State Park along state route S22. This is also right before the road takes a turn down into the Borrego Valley. The first portion of the route follows the boundary fence all the way to Chief Rock
The best way to go to the east of Chief Rock under White BM.
Chief Rock

This will keep you out of all private land and in Anza Borrego. Once past Chief Rock and White BM you will cross a road, this road leads back to one of the homesteads on private land. Cross the road and head straight for The Thimble directly in front of you. The easiest route is the south face. This most difficult move was only class three, this is near the top.
First Class Three Section

First Class Three Section 2

Second Class 3 Section

Our Climbing Route

The view from the Summit is excellent of the surrounding area. The most dominant feature is San Ysidro mountain which is only a half mile away. Borrego Springs is visible to the east 5,000 feet below. Whale Peak is visible to the southeast. Cuyamaca Peak is visible to south west. The Palomar range is visible to the west.
San Ysidro Mountain

Getting There

-Take CA 78 east to Santa Ysabel
-Take CA 79 north to S2
-S2 a few miles to S22
-Stay on S22 until you see the sign for Anza Borrego State park
-Park just past the sign on either side of the road

Red Tape

There is private land along the western edge of the trail. This is marked by an old barb wire fence.


Camping is permitted anywhere in Anza Borrego State Park

External Links

-4/9/2011 Trip Report
-4/17/2010 Trip Report
-1-23-2010 Photos
-Anza Borrego State Park

GPX Track