Ontario Peak and Bighorn Peak Trail Guide
Ontario Peak tops out at 8,694′ and Bighorn tops out at 8,441′ with a total of 4,170′ elevation gain – 14.5 miles up and back.
Ontario Peak and Bighorn Peak Quick Facts
Permit required: A free self-serve permit is required – Rangers check and you will be fined without one
National Forest Adventure Pass required for parking
Dogs on leash are allowed
Snow and ice in winter
Allow 8 hours
4,170′ of elevation gain
14.5 miles out and back
Trail tops out at 8,694′ for Ontario and 8,441′ for Bighorn
Ontario and Bighorn Peaks are located next to one another in the Cucamonga Wilderness and are accessed via Icehouse Saddle. Icehouse Saddle is the jumping off point for all of the peaks in this area which include: Timber Peak, Bighorn Peak, Ontario Peak, Cucamonga Peak, Etiwanda Peak, Telegraph Peak, Thunder Mountain, and Mount Baldy (Mount San Antonio). See map below and zoom in for more detail.
To get to Ontario and Bighorn Peaks, start at the Icehouse Canyon Trailhead and follow the trail along the creek for one mile to the Chapman Trail junction. From here you have two options; both trails go to Icehouse Saddle. From this junction, the Chapman Trail is 4 miles to Icehouse Saddle. If you continue up the Icehouse Canyon Trail it’s only 2.6 miles. Both trails go to the same place, but the Chapman Trail is longer, more scenic, and less steep. From Icehouse Saddle, Ontario Peak is 2.7 more miles. On the way back, Bighorn Peak can be accessed by following the Ontario Peak summit ridge northeast.
Directions to the Icehouse Canyon Trailhead
From the 210, take the Mount Baldy exit and travel north. Go through Mount Baldy Village and continue up the hill for a few miles. Take a right at the fork in the road toward Icehouse Canyon. The road ends in a parking lot. Get there before 7am on the weekends or you will have to park a long way from the trailhead. You will need to display the National Forest Adventure Pass to park at the trailhead. These can be obtained at the Mount Baldy Ranger Station on the way up.