Mount Islip, Big Cienega, and Windy Gap Loop

This loop is generally considered a moderate to difficult or strenuous hike. It features significant elevation gains, including a steep ascent on the Windy Gap Trail with sections up to a 31% grade. The terrain is mostly rocky, and much of the trail is exposed to direct sunlight due to past fires, adding to the challenge.

The trailhead is located within the Crystal Lake Recreation Area. Parking is available there, but an Adventure Pass is required for parking in this area. It's advisable to arrive early, especially on weekends, as parking can fill up.

Yes, a National Forest Adventure Pass is required for parking your vehicle at the trailhead within the Crystal Lake Recreation Area. This pass helps support the maintenance of facilities in the Angeles National Forest.

While the Angeles National Forest generally allows dogs on trails, it's always best to check specific regulations for this area. If dogs are permitted, they must be kept on a leash. Given the strenuous nature and exposed sections of the trail, ensure your dog is fit for the hike and carry extra water for them.

The best time to hike this loop is typically during the spring and fall when temperatures are milder. Spring offers the chance to see seasonal wildflowers, while fall provides cooler weather. Summer can be very hot due to extensive sun exposure, and winter may bring snow and icy conditions, requiring specialized gear.

The loop offers diverse scenery and notable features. You'll pass through the Windy Gap & PCT junction, experience sections of the Pacific Crest Trail, and reach the Mount Islip summit with its expansive 360-degree views. Other highlights include the lush Big Cienega Spring and remnants of the 2002 Curve Fire, showcasing the landscape's recovery.

Yes, there are a couple of natural water sources. You'll find the active Big Cienega Spring, known for its lush vegetation, and the perennial Little Jimmy Springs, which is often associated with the Little Jimmy Trail Camp. However, it's always recommended to carry sufficient water for your hike, as natural sources can be unreliable or require filtration.

Yes, the route incorporates sections of several other trails. You'll hike along parts of the Silver Moccasin Trail (NRT), the PCT - California Section D, the Big Cienega Trail, the Windy Gap Trail, and the Islip Ridge Trail, offering a varied hiking experience.

The San Gabriel Mountains are home to various wildlife. Hikers have opportunities for birding and may spot animals such as deer. There's also a chance to see Nelson bighorn sheep in the high meadow above Big Cienega Spring.

At the 8,251-foot summit of Mount Islip, you'll be rewarded with spectacular 360-degree panoramic views of the surrounding San Gabriel Mountains, and on clear days, you might even see distant views of Los Angeles County and the ocean. The summit also contains the ruins of an old cabin and the foundations of a former fire lookout tower.

Due to its classification as moderate to difficult, with significant elevation gains, steep sections, and rocky, exposed terrain, this loop is not generally recommended for beginners or young children. Hikers should have a good level of fitness and experience with challenging trails.