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Las Llajas-Rocky Peak-Chumash Loop

  4.1 ( 9 ) Favorite


9.4 mile 15.1 kilometer loop
87% Runnable


Ascent: 1,664' 507 m
Descent: -1,669' -509 m
High: 2,664' 812 m
Low: 1,241' 378 m


Avg Grade: 7% (4°)
Max Grade: 35% (19°)


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Trail shared by Kristof Mattei

A loop connecting three beautiful trails in Simi Valley.

Kristof Mattei

Features Views · Wildflowers


This loop run connects three of the more beautiful trails in Simi Valley. You can find shells at the highest point of this run (Shells Point) at around mile 5.5.

Need to Know

The last section of the loop (back to the starting point) is on a paved road in a residential neighborhood. Coming down Chumash Trail, go straight to the gate (mile 9-ish) to get onto the paved road.

Runner Notes

The Chumash downhill is a technical singletrack.


This fabulous run is one of the many ways to experience Rocky Peak State Park. The Marr Ranch section is accessed via the Las Llajas Trailhead off Evening Star Drive. The first two miles up the Las Llajas Canyon Rd are a gentle run on a road to a fork that splits to a private ranch to the left and access to Rocky Peak Fire Road to the right.

Take a right at the fork and begin a steady climb up to a ridge. Once on the ridge, you turn and continue up the fire road. The views are spectacular here. You'll climb the most strenuous section here along the Rocky Peak Fire Road until you reach Chumash Trail - Simi.

Chumash is a singletrack trail which will lead you back down to Simi Valley. You'll have to run another 0.5 miles or so through a neighborhood on asphalt to return to Las Llajas Trailhead.

Be aware, Rocky Peak has become very popular with mountain bikers so keep your eyes and ears open for fast moving bikers. You are less likely to encounter bikers once you get to the Chumash Trail - Simi section.

History & Background

The area around Marr Ranch is private property. There is a bee farm along the route so please respect the no trespassing signs.

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Dogs Allowed, Flora & Fauna

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May 20, 2018
David S
Yes! 9.3mi

Trail Ratings

  4.1 from 9 votes


  4.1 from 9 votes
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in California


13 Views Last Month
1,189 Since Dec 30, 2015



Another beautiful tree.
Nov 13, 2017 near Chatsworth, CA
Even though you're not far from the city, it feels like no man's land.
Nov 13, 2017 near Chatsworth, CA
Scenery you'll see, and no, the picture doesn't do the reality justice!
Nov 13, 2017 near Chatsworth, CA
The last climb, if you're doing the whole trail clockwise.
Nov 13, 2017 near Chatsworth, CA
Windmill on the fork between Las llajas and the connection to Rocky Peak Road (former goes to private property)
Nov 13, 2017 near Santa S…, CA
Looking down on Simi Valley.
Nov 13, 2017 near Santa S…, CA


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