Distance (round-trip)

7.8 mi


9 hrs

Elevation Gain

4560 ft




This incredibly challenging summit ascent takes you from the desert floor to the snow line and wastes little time in doing so. While the hike forces you to commit caloric genocide, the transcendent views you’ll obtain from the top compensate for every grueling step, every patch of difficult vegetation, and some pretty challenging scrambling up and over large rock outcrops.

San Ysidro Mountain 21

Borrego Valley from the upper reaches of San Ysidro Mountain

If you took a moment to peruse the stats for this hike before reading the trip report, your eyes might have bugged out slightly at what you read. If you didn’t look at the hike stats, go back and take a look. Yes. This hike gains 4,500′ in the space of 8 miles. Actually, 2 of those miles are pretty much flat, so really, you gain all of that elevation in 3 miles. Moreover, a lot of the gain comes during a steep stretch before the summit where the rate of climbing is a lot closer to 3,000′ per mile.

So, why? Why am I looking back on this hike with powerful nostalgia and wishing that you will get the same wild hair I got when considering San Ysidro’s east summit? Why am I recommending that you take a hike this difficult? If you’re the sort of hiker who is familiar with desert travel, and if you love a good challenge, and if you want to obtain a magnificent, almost aerial view of Borrego Valley that extends west to Mt. San Jacinto and east toward Arizona, then you’re not going to do much better than this.

San Ysidro Mountain

Sunrise over Borrego Valley

San Ysidro Mountain 8

Cairn beyond Panorama Overlook

All of the usual caveats for desert peak-bagging apply here: you should be in excellent physical condition with a good amount of experience in navigating, handling desert conditions, and dealing with the psychological challenges that come with a hike this hard. You should also be prepared with at least a gallon of water, sturdy footwear, sun protection, a reliable means of navigating, first aid kits (the brush gets pretty aggressive in a few spots), and you should leave a detailed itinerary and plan of return with a loved one. This is not a nature walk by any stretch.

San Ysidro Mountain 11

Toro Peak

The elevation spread on this hike ensures that you will that traverses a wide range of vegetation types from cactus scrub to pinyon-juniper woodland. The views are monumental and rival those found on the higher peaks of the nearby Santa Rosa Mountains. The experience of covering all of that ground is at once humbling and exhilarating, and the rewards of conquering the mountain correspond to that dichotomy. You will at the same time brag about the accomplishment and marvel at the fact that you could do it at all. That is one of the great wonders of desert peak-bagging, and this peak epitomizes the experience about as well as any other mountain in Anza-Borrego.

San Ysidro Mountain 12

The most rugged, steepest, and challenging part of the ascent

Navigation is a relatively simple affair. After you walk north on the paved trail from the Visitor’s Center, cut due west just before the campground, and follow the well-worn trail to the Panorama Overlook. You’ll continue past the overlook on a trail that gets progressively sketchy. Beyond the overlook, that trail essentially evaporates, and from now on your feet will land wherever the cacti are not.

San Ysidro Mountain 5

Borrego Palm Canyon Campground with Coyote Mountain and the Santa Rosa Mountains in the background

The first two miles of the ascent are relatively reasonable with a 1,000′-1,500′ per mile grade through scattered cacti and shrubs. Thickets of agave make things a bit more interesting around 2500-3000′ feet of elevation, and large boulders soon enter the mix of navigational obstacles.

San Ysidro Mountain 7

Just follow the ridge

Right around 3500′ of elevation, the brush gets denser, the boulders get bigger, and the pitch gets much, much steeper. At this point, the ascent is more of a painstaking rock-hop trying to find the barest hint of a path through formidable vegetation and rocks. Focus and diligence are your allies here. While this may sound like a chore, the concentration required for something so simple as moving through 100 yards of obstacles is actually a wonderful psychological experience. Compare and contrast that to whatever onerous and mundane tasks you might have to force yourself to do throughout the day, and suddenly picking your way through truck-sized boulders sounds like a grand old time.

San Ysidro Mountain 10

Indianhead Mountain

You’ll no doubt notice the view getting more and more aerial the higher you climb, and often these “spoilers” can diminish the final reveal when you reach the summit. However, that letdown didn’t happen for me on San Ysidro. Not only did views north toward Toro Peak and Mt. San Jacinto as well as closer afoot into the cavernous maw of Borrego Palm Canyon add a splash of revelation to the view, but by the time you’re standing over the desert, 4,500′ up but only a few horizontal miles away from Borrego Springs, the shock of just how high you climbed in so short a distance will be something to wrap your brain around.

San Ysidro Mountain 18

Christmas Circle

From here, the town is tiny. The roads are abstract ribbons of black threading through a spread of grids, splashes of green, and the duskier squares of citrus groves. Much of the Salton Sea is visible. The vast, bowl-shaped eastern spurs of the Peninsular Ranges spread around the glaring expanse of the Borrego Badlands like massive granitic arms reaching to scoop up the sweepings of ancient seas.

San Ysidro Mountain 15

Mt. San Jacinto

To the west, the San Ysidro Ridge extends to the range’s second highest point at Ysidro benchmark. It’s possible to follow this ridge to Ranchita, but the heavy vegetation along the way make that hike a real pants-shredder. Determined backpackers willing to schlep gallons of water to the top can find flat spaces for camping below the summit. Keep in mind that backpacking will cut your already tortoise-like pace in half. Backpackers will need the better part of the day just to get to the top.

San Ysidro MOuntain 22


Getting back down is simple navigationally, but nearly as difficult as the climb up. Loose stones, soft sands, and vegetation present the same obstacles in different ways. Slowly, painstakingly, and eventually, you’ll reach the desert floor and finish with an easy walk back to the Visitor’s Center.

Scott is an L.A. native and San Diego transplant who pulls every trick in the book to get out on the trail. His first book, a revision of Afoot and Afield San Diego County, is now out.


Views / Vista

Trail Map


Scott Turner Nov 3, 2017 08:11In reply to: Bob

Yep, I note that this is San Ysidro’s east summit within the writeup. The true summit is Ysidro benchmark, which I won’t create a route for due to the risks of encroaching on private property. Since the whole range from the eastern summit into Los Coyotes Res. is called “San Ysidro Mountain,” I went with a short hand that I clarified within the writeup.

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Bob Nov 2, 2017 19:11

You only made it about halfway to San Ysidro Mountain, which is all the way at the western terminus of that ridge.

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