Coquina Mine via Las Llajas Canyon

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Sunset over Simi Valley from Coquina Mine, Ventura County, CA
Sunset from Coquina Mine
Panoramic view of Las Llajas Canyon, Simi Valley, CA
Descending into Las Lllajas Canyon on the return

Coquina Mine via Las Llajas Canyon

  • Location: Evening Sky Drive, Simi Valley. From the 118 Freeway, take the Yosemite Ave. exit. Head north (turn right if you’re coming from the east; left if from the west) and go 1.3 miles to Evening Sky Drive. Turn right and drive 0.5 miles to the signed trail head on the left side of the road. Park where available.
  • Agency: Rancho Simi Recreation and Parks Department
  • Distance: 6 miles
  • Elevation gain: 1,050 feet
  • Difficulty Rating: PG-13 (Distance, elevation gain)
  • Suggested time: 3 hours
  • Best season: October – May
  • USGS topo map: Simi Valley East
  • Recommended gear: sun hathiking poles
  • More information: Trip description here; Everytrail report here
  • Rating: 7

Panoramic city and mountain views, abandoned mining gear, limestone formations, a quiet oak canyon and a rigorous workout are the highlights of this enjoyable trip on the outskirts of Simi Valley. The destination is Coquina Mine, a limestone quarry that was abandoned in the 1930s, although the expansive network of trails in Marr Ranch Open Space, Las Llajas (YA-has) make it easy to extend the hike.

Las Llajas Trail Head, Simi Valley, CA
0:00 – Trail head on Evening Sky Drive (click thumbnails to see the full sized versions)

From the Las Llajas trail head, follow the paved road to a T-junction. Bear right and descend into Las Llajas Canyon. The road becomes dirt and you follow it for an attractive if not terribly varied 1.5 miles or so, passing a few private inholdings and private roads branching off, including a bee colony about 1.1 miles from the trail head. As you head up the canyon, keep an eye out for interesting limestone formations on the hills above. If there have been recent rains, the sounds of a seasonal stream accompanies your walk.

Oaks in Las Llajas Canyon near Simi Valley, Ventura County, CA
0:18 – Oaks in Las Llajas Canyon (times are approximate)

At 1.8 miles, shortly after the trail crosses the stream, look for a faint but unambiguous single-track trail branching off to the left. The trail begins a steep, crooked ascent, clinging to the hillside, providing a nice aerial view of Las Llajas Canyon. After 0.6 miles of steady climbing, the trail briefly levels out. You pass by some rusting mining equipment as the trail winds around the north side of a ridge.

0:38 - Umarked trail leaving Las Llajas Canyon
0:38 – Umarked trail leaving Las Llajas Canyon

At 2.7 miles, you reach a T-junction. Follow the trail as it makes a hard left, climbing a few more switchbacks with excellent views to the south of Simi Valley, the Simi Hills and the Santa Monica Mountains. As you pass by an abandoned engine on the left side of the trail, you’ll also notice a large steam shovel perched on the hill in the distance; that is the destination. At another T-junction, turn left and walk the last few yards to the steam shovel. Shortly beyond it, you get an outstanding view which includes Anacapa and Santa Cruz Islands. In the distance to the north is the round, antenna-covered summit of Oat Mountain, the highest peak in the immediate area.

Trail in the hills above Las Llajas Canyon near Coquina Mine, Simi Valley, CA
1:07 – Left turn at the T-junction

After enjoying the view, retrace your steps. If you want to extend the hike, you can walk farther up Las Llajas Canyon; back at the first T-junction, you can also explore more by following the vague path to the right. This reaches a saddle where you can climb to a vista point with more all-encompassing views.

Steam shovel, Coquina Mine, Simi Valley, CA
1:18 – Steam shovel at the Coquina Mine site (turnaround point)

Text and photography copyright 2015 by David W. Lockeretz, all rights reserved. Information and opinions provided are kept current to the best of the author’s ability. All readers hike at their own risk, and should be aware of the possible dangers of hiking, walking and other outdoor activities. By reading this, you agree not to hold the author or publisher of the content on this web site responsible for any injuries or inconveniences that may result from hiking on this trail. Check the informational links provided for up to date trail condition information.


  1. Been on this hike. Planning to take some Boy Scouts there and came across this site when I searched for information on the mine. I thought the information you provided about the hike was perfectly descriptive. Thanks!

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