Challenging hike, but well worth it total of 13.6 miles, not the 12.1 miles as stated on AllTrails, and an absolute elevation gain of 3,680 ft (3850 ft gain overall). From the Icehouse Canyon trailhead, for about 1.5 miles, there are boulders to hop on which does not make it the most enjoyable hike. After passing a few cabins near the 2 mile mark, it smooths out to a dirt road up to the Icehouse Saddle, albeit fairly steep (3.76 miles and 2,580 absolute elevation gain). Chapman Trail junction starts about a mile from trailhead and connects back to the main trail 0.6 miles below the Saddle. I would avoid this unless there is a desire to add about 2 miles to the hiking distance or stop at the Cedar Glen campground. It is a narrow path and in my opinion hard to maneuver. The Saddle is gateway to several peaks. From there to Ontario Peak is 2.8 miles and a gain of 1,100 ft. This part of the trail is actually easier and less steep than the path from the trailhead to the Saddle. On the way, you pass through the Kelly campground and the junction to Bighorn peak. The Ontario peak itself is not the most interesting summit. There are boulders covering the 360 view, though still amazing views from way up there. A few feet below the peak is a better spot for panoramic views. On a personal note: I either underestimated the trail or overestimated my abilities–it had been a year since I had tried a peak such as this (or both). I got a relatively late start (8.30 am), took my time to stop for photos and spent approximately 30 and 15 minutes at the Saddle (on the way up and then down respectively), plus over 30 minutes at the summit. I ended up doing the last 2.5 miles in the dark, and it was “dark dark!!” I had a good headlamp but still had to go real slow especially the last 1.5 of miles to the parking lot as it is very rocky and needed to step on sometimes-large boulders. Interesting experience but I would avoid it the next time.