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Chumash Trail Out and Back to Rocky Peak Road

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A spectacular Spring day on the Chumash Trail in Simi Valley

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.

Some related posts: Chumash Trail Mule Deer, Category Is: Things Found on the Chumash Trail, Chumash Trail Rocks & Snow, Chumash-Las Llajas Loop

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A Bear on Rocky Peak Road?

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Low clouds spilling over Rocky Peak Road near the Chumash Trail.
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. October 2022.
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.

Bears aren’t particularly common here, but they are seen from time to time. I wondered if this was the bear that had been discovered in the kitchen of a Simi Valley home in early September.

Bears have also been captured on local trail cams. In December 2015, the NPS photographed a bear and her cub feeding on the carcass of deer in the Santa Susana Mountains. Even more remarkable, in July 2016, a bear was photographed in Malibu Creek State Park by an NPS camera trap.

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.
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.

Here’s an interactive, 3D terrain view of a GPS track of the extended Chumash – Las Llajas loop. 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.

Some related posts: Chumash-Las Llajas Loop, Not So Flat Las Llajas Canyon, Exploring Las Llajas, Marr Ranch Wildflowers

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Chumash Trail Mule Deer

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Mule deer on the Chumash Trail in Simi Valley

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
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.

Some related posts: Chumash-Las Llajas Loop, Deer Encounters, Running Between Raindrops: Chumash Trailhead to Rocky Peak

adventures, marr ranch open space, nature, photography, running, simi valley, trail running, trails, trails|smmc open space, wildflowers, wildlife

Chumash-Las Llajas Loop

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Rocky Peak Fire Road between the Chumash Trail and Fossil Point
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′.

View of Oat Mountain from near the top of the Chumash Trail.
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.
Road connecting Rocky Peak Road to Las Llajas Canyon.

Following a short downhill, the road continues past a fallen valley oak that was killed by the 2011-2015 drought. There is a fork in the road here. The road connecting to Las Llajas Canyon goes up a short hill to an overlook of the canyon. From the top of the hill, there are more than 4 miles of downhill through the winding canyon. There used to be oil field equipment on the connector between Rocky Peak Rd. and Las Llajas Canyon, but it has been removed.

If the creek in the canyon is flowing, there are several places where the (usually) small stream crosses the road. In the Spring and early Summer, many species of wildflowers can be found in the canyon.

Cattle on the Las Llajas Loop
Cattle on the Las Llajas Loop

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.

Some related posts: Chumash Trail Rocks & Snow, Exploring Las Llajas, Marr Ranch Wildflowers,  Things Found on the Chumash Trail

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Marr Ranch Wildflowers

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Woolly paintbrush above Las Llajas Canyon
Woolly paintbrush above Las Llajas Canyon

This rain season’s on again, off again pattern has produced an exceptional selection of wildflowers.

Here is a slideshow of a some of the flowers blooming in and around Las Llajas, Chivo, and Tapo Canyons.

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Chivo Canyon Peaks and Clouds

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Chivo Canyon peaks and clouds
Climbing out of Chivo Canyon on the way to Las Llajas Canyon

From an out and back run between Tapo Canyon and Las Llajas Canyon.

Like the Las Llajas Canyon Trail, this segment of the Chivo Canyon Trail is part of the Rocky Peak 50K course.