Difficulty PG13 Distance 5.1 to 10 miles Puente Hills, Chino Hills & North Orange County Rating: 4-6 Season: All year

Fremont Canyon to Weir Canyon (Irvine Ranch)


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Blind Canyon Road, Orange County, CA
Looking south from Blind Canyon Road
Weir Canyon, Orange County, CA
Oaks in Weir Canyon

Fremont Canyon to Weir Canyon (Irvine Ranch)

  • Location: Irvine Regional Park. From the 55 freeway, take the Chapman Avenue exit and head east for 4.2 miles until you get to Jamboree Road. Take a left on Jamboree and a right into the park.  From the north, take the Katella Avenue exit from the 55 freeway, head east and drive 4.6 miles to Jamboree and take a left (Katella becomes Villa Park and then Santiago Canyon Road on the way). Parking is $3 per car on weekdays, $5 on weekends and $7 on holidays.  For access to this hike, park in lot #3 and caravan with other hikers and trip leaders to the Fremont Canyon Staging Area, half a mile up the road.
  • Agency: Irvine Ranch Natural Landmarks/Irvine Regional Park
  • Distance: 9.4 miles
  • Elevation gain: 1,150 feet
  • Difficulty Rating: PG-13 (distance, elevation gain)
  • Suggested time: 3.5-4.5 hours, depending on pace of group
  • Best season: Year round but hot during the summer; available whenever offered by the Irvine Ranch Conservancy
  • USGS topo maps: Orange, Black Star Canyon
  • Recommended gear: hiking poles; sun hat; sunblock
  • More information: Description of hike held on 7/29/16 here; Trip description (Fremont Canyon portion of the hike) here; Map My Hike report here
  • Rating: 6
Fremont Canyon, Orange County, CA
0:00 – Start of the hike at the Fremont Staging Area (click thumbnails to see the full sized versions)

This challenging hike is usually offered one Friday morning per month by the Irvine Ranch Conservancy. Whenever possible, it is done as a horseshoe-shaped point to point hike, saving three miles of walking on pavement. This post assumes that hikers will be driving to Irvine Regional Park and then being shuttled to the Fremont Canyon Staging Area to begin the hike.

Coal mine, Fremont Canyon, CA
0:55 – Coal seams at the mine site (times are approximate)

Navigation is easy, as most of the route is on fire roads; additionally the hike is guided so there is very little chance of getting lost. However, this post will give you a good idea of what to expect if you decide to sign up for this trip. Hiking counter-clockwise puts most of the climbing (about 900 feet) at the beginning of the route. It may seem like an unnecessarily difficult way to start, but especially during the summer months, with the majority of the hike on exposed terrain, it’s good to get it out of the way early. As you ascend, you’re rewarded with views of Irvine Lake to the south and Old Saddleback to the east. The landscape is dotted with a few oaks, some chaparral and the invasive Russian Thistle, better known by the name it takes on after it dies: tumbleweed.

Blind Canyon, Orange County, CA
2:00 – Beginning the second ascent after passing under the freeway

At about one mile from the start the grade levels out as you reach a saddle where you get an aerial view of the 241 Toll Road. Farther off are the summits of the San Gabriels; if visibility is good, expect to see Mt. Lukens, Mt. Wilson, Mt. Baldy and its neighboring peaks. The road then bends northeast, following the ridge on the west side of Fremont Canyon and making one last climb to a vista point 2.2 miles from the start. Just above, a coal seam is visible in the red rocks alongside the road. A sign incorrectly spelling the name of the road as “Cole Mine Road” is the work of boy scouts who volunteered to build signage for the area. The Irvine Ranch Conservancy staff has left the sign as is, its story making for some nice comic relief following the steep climb. (There isn’t much left to see of the mine other than the seams).

Weir Canyon, Orange County, CA
2:40 – Descending into Weir Canyon

Shortly after the mine site, you make a left turn onto Blind Canyon Road. (Some hikes offered by the conservancy continue uphill, past the weather station and to the upper reaches of Fremont Canyon.) The trail then makes a long, winding descent. Panoramic views make up for the noise from traffic on the toll road and the overhead power lines. After crossing under the road at 4.6 miles, the approximate halfway point of the hike, you begin another ascent. Here, the ridges block out traffic noise, although you may still hear buzzing from the overhead power lines.

Canada de los Bueyes monument, Weir Canyon, Orange County, CA
2:55 – “Canada de los Bueyes” monument in Weir Canyon

At 5.5 miles, you begin a mile and a half descent into Weir Canyon. You reach the “Canada de los Bueyes” (Canyon of the Oxen) monument, memorializing the area’s history as part of a trade route and the destination of another hike offered by Irvine Ranch Conservancy. Head left and make a pleasant mile and a half descent through Weir Canyon and pass through a gate into Irvine Regional Park. From here, the group will make their way back through the park, likely using the Roadrunner Loop and Santiago Creek Trails, returning to the parking area in about a mile.

Irvine Regional Park, Orange County, CA
3:20 – Home stretch: re-rentering Irvine Regional Park

Text and photography copyright 2016 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.

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