Upper Solstice Canyon Trail Malibu Castro Crest from Corral Canyon Road through Upper Solstice Canyon in the Santa Monica Mountains

Between Corral Canyon Road and Castro Crest, the Backbone Trail passes though a remote segment of the Santa Monica Mountains know as Upper Solstice Canyon. While it is possible to feel quite removed at the bottom of this trail, the high ridges on both ends provide such sweeping views as to immediately restore your sense of place. From Corral Canyon Road to Castro Crest is 5.5 miles round trip with 540 feet of elevation between the low and high points of the trail. Beyond Castro Crest, one can trek another half mile up Newton Road toward the top of Castro Peak, or continue along the Backbone Trail toward Latigo Canyon Road and beyond.

There are trails going in a few directions at the top of Corral Canyon Road, making it a popular starting point for mountain bikers. Park at road’s end and locate the sign for the Backbone Trail to the left. Lace up and start hiking west.

At the start, the Backbone Trail is wide enough for an ATV, but shrinks to a more standard single-track farther into the canyon. Strung out switchbacks lead to an unmarked intersection with a wide fire road, 0.6 miles from the start. To the right, the road ascends to Castro Motorway, a fire road that connects to the top of Corral Canyon Road. To continue on the Backbone Trail, head straight through the intersection and pick up the trail on the other side. There are no further junctions between here and Castro Crest.

Backbone Trail Upper Solstice Canyon
Looking down the trail toward Castro Crest
Backbone Trail Upper Solstice Canyon
Looking down into Upper Solstice Canyon

Descend the chaparral-covered slopes toward a narrow section of the canyon. After 1.3 miles, you will reach the canyon floor at an elevation of 1,725 feet. The trail turns northwest toward Castro Crest, crossing several small (and usually dry) creeks as it travels through an enchanting forest at the bottom of the canyon. Even as Upper Solstice Canyon widens, the dense woods feel surprisingly isolating.

Backbone Trail Upper Solstice Canyon
The Backbone Trail through the forest at the bottom of Solstice Canyon

Half a mile before Castro Crest, and 2.25 miles from the start, the Backbone Trail begins to climb out of the canyon, switching up the western slope. The trees give way to broader views of Upper Solstice Canyon, offering an exceptional perspective over the world you’ve been hiking through. After ascending 540 feet from the canyon bottom, the trail reaches the saddle named Castro Crest.

Backbone Trail Upper Solstice Canyon
Looking down on Upper Solstice Canyon from Castro Crest

Castro Crest provides partial ocean views beyond the mountains to the south. A postcard perspective to the west exhibits the highest peaks in the range.

The Backbone Trail drops down the other side of the crest, continuing another 1.4 miles to Latigo Canyon Road. As an alternative, hikers may park along Latigo Canyon Road and venture to Castro Crest from that trailhead, for a shorter less-rustic experience that is still quite enjoyable. (Read the Latigo Canyon Road to Castro Crest trail report for more details.)

In an ideal world, one would hike from Castro Crest up Newton Road to Castro Peak and take Castro Motorway back to Corral Canyon Road. This fantastic loop was a reality for decades until recent private ownership closed the peak to through traffic including hikers. Newton Road is currently only hike-able for another half mile. The road climbs 260 feet to broader views of the Santa Monica Mountains, and is worth the extra effort. This extension creates a 6.5-mile round trip hike with 800 feet of elevation change.

Castro Crest
The gate on Newton Road

Turn right and march up Newton Road to the hike-halting security gate. You are unlikely to see a higher concentration of uniquely phrased “no trespassing” signs anywhere else on the planet. Clearly hikers are not welcome on the other side of this fence, and it is a shame. Castro Peak is the fifth highest summit in the Santa Monica Mountains at 2,824 feet, but you can only hike to 2,525 feet. No Santa Monica Mountain to the east is any taller than Castro Peak, so on a clear day the view in that direction is nearly ceaseless.

Castro Crest
Looking east toward Corral Canyon Road
Castro Crest
Looking south from Castro Motorway

Because the gate is so imposing, you have no choice but to turn around and head back the way you came. The owners of Castro Peak should really work out a system where hikers are allowed to access the peak, if only a couple days a month. With any luck, hikers will someday again have the option to hike the scenic loop over Castro Peak.

From Corral Canyon Road to the gate above Castro Crest is 6.5 mile out and back with 750 feet of elevation between the top and bottom of the trail. Without a true summit, or waterfall, or other landmark attraction, Upper Solstice Canyon quietly provides a very appealing hikes, and may be one of the more secluded trails in the Santa Monica Mountains.

To get to the trailhead: Take PCH to Malibu and turn inland on Corral Canyon Road (west of Malibu Canyon Road and Pepperdine University at the intersection with the 76 gas station). Drive past the entrance to Solstice Canyon and continue another 5.2 miles up Corral Canyon Road to road’s end. Park along the right side of the road and find the trailhead on the left.

Trailhead address: Castro Motorway, Agoura Hills, CA 91301
Trailhead coordinates: 34.08209, -118.75854 (34° 04′ 55.77″N 118° 45′ 30.58″W)

Elevation Profile
Click or hover over any spot on this elevation profile to see the distance from the start and elevation above sea level at that location, which will be highlighted on the map.
Trail Map

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These photos were taken in October and November of 2010. Click to enlarge.
Nearby Trails
Castro Crest Castro Crest from Latigo Canyon Road
This 3.8-mile hike crosses a green canyon and climbs to a scenic saddle below Castro Peak.
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Mesa Peak Malibu Mesa Peak from Malibu Canyon Road (Piuma Trailhead)
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Escondido Falls hike Escondido Falls
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3 Comments on Castro Crest from Corral Canyon Road through Upper Solstice Canyon in the Santa Monica Mountains

  1. Charlotte Wolter wrote:

    I hiked the top part of this up to the gate. Yes, it is disappointing and strange to see such dire warnings in such a beautiful place. On the positive side, there are a couple of good places for rock scrambling, and the views are great.

  2. MDL wrote:

    Years ago I used to run the loop through the private property before there was a fence. One time they were in the process of building the fence and as I ran by they stopped and looked at me. I thought to myself, how much of a threat do they think a hiker or runner poses to them on a trail? Especially because no one actually lives up on the peak or would be disturbed by someone hiking by. It’s odd for sure.

  3. elizabeth cheung wrote:

    A fire has come through the area recently (most likely the Woolsey fire) and most of the trees are just blackened skeletons, though a few are coming back. The middle part of the hike (in the canyon) is probably the most scenic part. Go early as there’s very little shade along most of the trail. If you can start ascending to the crest before noon, you’ll get some shade from the mountain and trail itself as you hit the switchbacks.