Text and photography copyright 2010 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. The author does not take any responsibility for injuries sustained during hikes or walks on the routes described here. Check the informational links provided for up to date trail condition information.
Gilman Peak from Rim Crest
- Location: Yorba Linda. From the 57 freeway, take Orangethorpe exit and head east for 4.2 miles. Turn left on Kellogg, go 1.8 miles and turn right on Yorba Linda Blvd. Go 0.3 miles and turn left on Fairmont. Go 1.6 miles and turn left on Rim Crest. Follow Rim Crest to its end and park on the corner of Blue Gum and Rim Crest. From the Riverside area, take the 91 freeway to Yorba Linda Blvd. Go northwest on Yorba Linda Blvd. for 2.4 miles, and turn right on Village Center. Go a mile and turn left on Fairmont. Go 0.3 miles and turn right on Rim Crest.
- Agency: Chino Hills State Park
- Distance: 4 miles
- Elevation gain: 1,050 feet
- Difficulty Rating: PG
- Suggested time: 2 hours
- Best season: November – May
- USGS topo map: Yorba Linda
- Recommended gear: hiking poles; sun hat; insect repellent
- More information: Chino Hills State Park Yelp page here; Everytrail report here
- Rating: 7
Gilman Peak (elevation 1,685) is the second highest point in Chino Hills State Park. A popular approach is the seven-mile round trip route from Carbon Canyon (see here for more info). The southern approach, from Rim Crest in Yorba Linda, is shorter – but steeper.
From the Rim Crest entrance, head into the park and stay straight at the junction with the South Ridge Trail. Follow the single-track Easy Street Trail through a field and down into a tree-lined canyon (a tributary of Telegraph Canyon, which traverses the park.) At 0.4 miles, turn right on Telegraph Canyon and begin a gradual ascent over the next 0.6 miles.
Just before the junction with the Little Canyon trail, look for an unsigned trail heading off to the left. This is the route to Gilman Peak and it’s where the work begins. You climb up the west wall of the canyon, ascending 300 feet in 0.3 miles. The trail heads west, through a field, giving you a brief respite. At 1.5 miles, you reach a ridge where you get nice views to the west, extending to the Palos Verdes Peninsula if the air is clear. Take a sharp right and head north, gradually then steeply, and arrive on the flat summit of Gilman.
Here you will be rewarded for your troubles with great views of the San Gabriel Valley, the rest of Chino Hills State Park and much of Orange County. If the air is clear, the views Mt. Baldy and the Ontario/Cucamonga Ridge are hard to beat, and you may also get a glimpse of San Gorgonio and San Jacinto farther east.