It rained yesterday, and today, the unsettled weather produced cloud-enhanced views of the Simi Valley and Boney Mountain from the Chumash Trail.
Invasive mustard near the Chumash Trailhead
In the title photo, beyond the foothills of Simi Valley, is Boney Mountain. More than just a peak, Boney Mountain is a prominent volcanic massif at the western end of the Santa Monica Mountains.
In the photo, Sandstone Peak (3116′) — the highest peak in the Santa Monica Mountains — is on the left side of the massif, and Tri Peaks (3040′) is on the right. (Elevations are from PeaKBagger.com.)
The views from the Chumash Trail underscored the season, as did the Spring wildflowers. Like many other low-elevation areas of Southern California, a forest of black mustard covered the first few hundred yards of the trail.
Bush sunflower along the Chumash Trail.
Farther along the trail, bright yellow patches of bush sunflower amplified the scattered patches of sun, and yellow pincushion and golden yarrow added dabs of color to the chaparral.
Several species of Ceanothus are found along the trail. Hairy-leaved Ceanothus was in bloom. It is one of two local Ceanothus species that are 3-veined from the base but the only one with finely serrated leaves.
Notable for its beauty and dangerous character, this poisonous Fremont’s star lily was found about halfway up the trail.
Ahead, the lights of two runners turned this way and that, and behind me more headlamps danced up the canyon. The moon was high in the sky and nearly full. I took advantage of a smooth stretch of fire road, and turned off my headlamp to enjoy running in the surreal light.
Getting ready to check-in runners at the No Name 50K/15K
I was in Cheeseboro Canyon and a mile or so into the 2024 No Name 50K. Along with several other runners, I had opted for the early start. Partly because there’s something special about running in the hours before dawn, but also because strong Santa Ana winds were forecast, and I wasn’t sure how hot and windy it was going to get. So far, so good. The only wind was a sometimes cool, sometimes warm, down-canyon breeze.
Usually, when I run Cheeseboro Canyon, it’s from the Victory Trailhead at Ahmanson, and I run down the canyon. It was good to be running up the canyon for a change. The Cheeseboro Canyon Trail is a combination of fire road and single track that gains about 500′ over the 4+ miles to the Sheep Corral Trail junction. There are several very short, steep, rocky sections, but most of the trail is straightforward and enjoyable. Because of all the rain the past two years, the trail near Sulfur Springs was a bit muddy. Running by headlamp, I managed to step in the muckiest of the mud.
Dawn from the Sheep Corral Trail.
From the top of Cheeseboro, it’s about a mile over to Palo Comado Fire Road on a well-used, up-and-down single track. Just before Palo Camado, I stopped at an overlook to take in the view to the east. San Gabriel Peak and Mt. Wilson were silhouetted in the distance, and a few orange-red clouds preceded the sun.
Once on Palo Comado Fire Road, it took about 15 minutes to get up to China Flat. The timing was perfect — the warm light of the new sun highlighting Simi Peak and the greens and golds of the oak grasslands.
Downhill on Albertson Fire Road to Lang Ranch.
The aid station at Albertson Mtwy Fire Road marked the beginning of a 3-mile downhill to Lang Ranch. I put out of mind that we would be coming back up this hill and just enjoyed the descent.
Following a quick stop at the Lang Ranch aid station, I retraced my steps on Albertson Fire Road back to the Alapay/Lang Ranch Ridge Trail and the start of a scenic 3.5-mile keyhole loop. This memorable segment sets the tone from the start, gaining about 500′ in a mile. The route is a variation of the popular “Lang Ranch Loop,” and the support from the hikers on the trail was much appreciated. So was the encouragement from the awesome group of local runners (in the title photo) — each of the three times I passed them. I still hear their cowbell!
After returning to the Lang Ranch Aid Station, I started up Albertson Fire Road a second time. The volunteer at the Alapay/Lang Ranch Ridge Trail checked my bib number, and I began the long climb back to China Flat.
China Flat and Simi Peak from Albertson Mtwy Fire Road. From a training run.
After doing the steep climbs on the Lang Ranch loop, the grade on Albertson didn’t seem so bad. Plus, the weather was cooperating. We were on the second day of a Santa Ana wind event, and I had envisioned running into a 20 mph headwind here. Other than a couple strong gusts, the wind was more of a cooling breeze.
The runner passing me confirmed that the Albertson climb was made for poles — if only I had them. I’d done Albertson on a training run and debated using them for the race. Poles are helpful in a lot of ways, but more efficient uphill propulsion is probably the most important.
After a false summit or two, I eventually reached the aid station at the top of the climb. The smiling volunteers asked me if I needed anything. I told them I was good to go and continued down into China Flat. I could relax for a while. It would be mostly downhill until the aid station in Palo Comado Canyon — about 3.5 miles away.
Palo Comado Canyon Trail/Fire Road below China Flat. From a training run.
Running down Palo Comado from China Flat was a bit like the run down Albertson, except it was 20 degrees warmer. With the low humidity, I reminded myself to stay hydrated and not pound the downhill. The Cheeseboro Ridge section of the course was a few miles ahead, and the last thing I needed was crampy legs.
At the Palo Comado aid station, I grabbed a peanut butter sandwich and headed up the hill. Like the climbs at Lang Ranch, the hill was steep but relatively short. As I started the descent into Cheeseboro Canyon, I looked across to the power lines on Cheeseboro Ridge. There were runners over there, and I wondered how they were doing. I would find out soon enough.
At the Cheeseboro aid station, I filled my Camelbak to the brim, put some chips in a baggie to eat on the run, and started up the fire road toward Cheeseboro Ridge.
The Cheeseboro Ridge segment of the course follows an SCE powerline service road for about three miles, gaining more than 700′ along the way. On a hot day, it can be very hot, and on a windy day, very windy. There is zero shade. The Cheeseboro Remote Weather Station is passed about a mile up the service road.
Superb running in Cheeseboro Canyon.
Keeping in mind that the station measures the temperature inside a white, ventilated instrument housing several feet off the ground, the Cheeseboro RAWS midday temp was around 78degF and the wind was 16 mph out of the ENE, gusting to 29 mph. On the fire road, the in-the-sun temp was at least in the mid-80s but didn’t feel too bad.
I was glad to get to the high point of the ridge at the rocky overlook. There were still a couple of small hills to go, but from the viewpoint, it was going to be mostly downhill to the finish.
Many thanks to SoCal Trail, the volunteers, photographers, runners, and everyone involved for a great race!
Originally published June 28, 2008. Updated December 30. 2022.
Without a doubt, the Chumash Trail is one of my favorite short “after work” trail runs. Popular among hikers, mountain bikers, and runners, the Chumash Trail starts on Flanagan Drive in eastern Simi Valley and ascends the convoluted western flank of Rocky Peak Park to Rocky Peak Fire Road. It’s single-track trail all the way, gaining about 1175′ over 2.7 miles.
From a trail runner’s training perspective, it is a nearly ideal short, technical, higher heart rate workout. It has a few tough sections but is generally very runnable. When I’m chugging up the trail, it seems just about the time my heart rate is going to go lactic, the trail will back off or contour. Because I usually run the trail near my aerobic maximum, it’s a great indicator of where I am in my training. Over-training, or any other fitness issue, is usually plainly — and sometimes painfully — evident.
In many ways running down the Chumash Trail is more difficult than running up. It can be very challenging to run down a rocky, technical section of trail with any speed. Running a trail like the Chumash Trail can help develop the skill and strength necessary to do downhills with better technique and more speed.
I don’t think I’ve ever run this trail fresh, but a couple of times a year, when my legs feel good, it’s fun to really push the Chumash Trail up and down. Like most running, there’s a balance — push too hard on the up and there won’t be enough left to push the down.
Here is an interactive, 3D terrain view of the Chumash Trail Out & Back to Rocky Peak Road. The map can be zoomed, tilted, rotated, and panned using the navigation control on the right. Track and placename locations are approximate and subject to errors. Poor weather and other conditions may make this route unsuitable for this activity.
There are several ways to extend the basic out and back. One option is to turn left on Rocky Peak Road and run a mile to “Fossil Point.” Another is to turn right and run 1.6 mile to the Rock Peak overlook.
Low clouds spilling over Rocky Peak Road near the Chumash Trail.
Wait a minute… I stopped running down the hill and walked back to look at the sizable pile of scat.
I was on Rocky Peak Road, at about mile 3 of an extended version of the Chumash – Las Llajas loop, and just past the top of the Chumash Trail.
Bear scat on Rocky Peak Road. Click for a larger image.
No doubt about it. It was bear scat. The bear had been eating holly-leaved cherries, and the scat was full of cherry pits. Over several decades of running Rocky Peak Road, this was the first time I’d seen evidence of a bear in the area.
This morning, I looked for bear tracks around the scat, but thunderstorms and bike traffic had erased them. After taking a couple of photos, I continued toward the high point of the loop, “Fossil Point.”
Cairn at “Fossil Point” — the highest point of the Chumash – Las Llajas Loop.
What had started as a very foggy morning was transitioning to a cool Fall day with a mix of sun and clouds. From the cairn at Fossil Point, Oat Mountain was still partially shrouded by clouds. Below the overlook, I spotted a couple of mountain bikers working up the road. The ride up Las Llajas Canyon has become a popular e-mountainbike ride, and e-bikes would be the only type of bike I would see on my way down the canyon.
The run down Las Llajas Canyon was pleasant and fast-paced. Lately, I’ve been doing a variation of the loop that jumps over to the Marr Ranch Trail using a trail that splits off the Coquina Mine trail. This route gets you up and out of the canyon and onto a ridge with good views of the surrounding terrain. It’s a bit more adventurous and adds a little mileage and elevation gain to the usual loop. The Coquina Mine trail is easy to miss — it branches off Las Llajas Road after passing the towering cliffs.
I saw a flash of brown through the bushes on the trail ahead. I stopped as a deer emerged from a switchback. The doe was walking slowly up the trail with her mule-like ears turned back toward me. I said something like, “Where are you going?”
She turned toward me and stared quizzically. As I slowly pulled the phone from my pack, I continued to talk. Her expression was a mix of caution and curiosity. It was as if she couldn’t quite make up her mind what I was about.
Mule deer at Trippet Ranch
This was peculiar behavior for a deer in this area. It wouldn’t be so strange if I was at Trippet Ranch. The deer there graze around the oaks and grasslands near the parking lot and are used to seeing people. But in decades of running the Chumash Trail, I’ve only occasionally seen deer, and they have always been skittish and quick to react.
This doe watched me as I slowly walked around the bend and toward her. I was reminded of a friend’s experience, when he was hit on the shoulder by a spooked deer. Not wanting to force a reaction, I stopped. The deer casually stepped off the trail and disappeared down the ravine.
Later, running down Las Llajas Canyon, I was startled by the sound of something large moving in the brush. This time I got only a fleeting glimpse, as the deer bounded uphill through the trees, rocks, and brush.
Rocky Peak Fire Road between the Chumash Trail and Fossil Point
Update of a post from December 30, 2006.
The Chumash-Las Llajas Loop is a scenic 9.3 mile trail run in the eastern Simi Valley. Run counterclockwise, it combines a strenuous climb on a single-track trail and fire road with a fast-paced 4-mile downhill on a dirt road. The cumulative elevation gain/loss on the loop is about 1600′.
Nearing the top of the Chumash Trail
I like to do the loop starting at the Las Llajas Canyon trailhead on Evening Sky Drive. A short jog up Evening Sky Dr., then across a field, and you’re on your way up the Chumash Trail. From this point, it’s an approximately 1000′ climb over 2.7 miles of rocky trail to Rocky Peak fire road.
After turning left (north) on Rocky Peak fire road, a short downhill is followed by three-quarters of a mile of climbing to “Fossil Point.” A short detour off the main fire road leads to a cairn marking the high point. From here there is a panoramic view of Oat Mountain, San Fernando Valley, San Gabriel Mountains, Santa Monica Mountains, Simi Valley, Boney Mountain, Channel Islands, and Ventura Mountains.
Exposures of fossil shells are found near the high point. According to the area’s Dibblee geology map, these may have been deposited in shallow marine lagoons a couple million years ago.
From the high point, the loop continues north on Rocky Peak Road. At first, it descends steeply, then climbs to a hilltop with a few valley oaks. Partway up the hill, a roadcut reveals the long roots of the chamise plants on the hillside.
Road connecting Rocky Peak Road to Las Llajas Canyon.
Some of the wildlife, and not-so-wild animals, I’ve encountered on the loop include rattlesnakes and other snakes, deer, longhorn cattle, roadrunners, and a kangaroo rat. Although others have seen mountain lions in the area, I’ve only photographed their tracks.
The loop ends with a short, steep climb up a paved road. At the top of the hill, turn left to return to the trailhead.
Explore the scenery and terrain on the Chumash-Las Llajas Loop trail run using our high resolution, interactive, 3D viewer. The imagery is so detailed, it’s almost like being there! To change the view, use the control on the upper right side of the screen, the CTRL key and your mouse, or touch gestures. Track and placename locations are approximate and subject to errors. Poor weather, and other conditions may make this route unsuitable for this activity. (It is also possible to start the loop at the Chumash Trail trailhead at the end of Flanagan Dr.)
The title photo is a section of Rocky Peak fire road between the top of the Chumash Trail and Fossil Point. It is from a run on October 6, 2020.
