Forest Adventure Pass is required to park at the trailhead.
Pacific Crest Trail. You are rewarded with great views of the high dessert the majority of the way up the trail to Mt. Islip and even better views once you get close to the summit of Mt. Islip. The majority of the hike to the summit of Mt. Islip is along the Pacific Crest Trail. You are going to follow the pacific crest trail all the way through Little Jimmy Campground. You also have an alternate option at about a mile from the trailhead. At this point the Pacific Crest Trail crosses a dirt service road that also goes to Little Jimmy Campground. The Pacific Crest Trail is a more scenic option to take to Little Jimmy Campground. The only time the trail is a little difficult to follow is when you go through the campground. Once you find the trail on the other side of the campground you continue on the Pacific Crest Trail and then split off onto the Mt. Islip Trail. All trail splits are usually well marked and easy to follow. From this junction you have just under a mile to the top of Mt. Islip where you are rewarded with amazing vistas. Return to the trailhead via the same route. The total hike to Mt. Islip is roughly 7 miles roundtrip and has about 1,590 feet of elevation gain.
Saddleback Mountain, Mt. San Jacinto, and much more on a clear day from Mt. Islip. Ashley and I both loved this hike to Mt. Islip and would highly recommend it to those looking to make it to the summit of a major peak in the high San Gabriel Mountains.
Rating: Elevation Gain: 1,590 ft. (Moderate), Distance: 7 Miles Roundtrip (Moderate).
Time to Complete Hike: 4 - 5 hours.
View Mt. Islip in a larger map