Iron Mountain via Heaton Flats Trail

Known to be one of the most remote and challenging day hikes in the Angeles National Forest, the hike up Iron Mountain via Heaton Flats Trail is best left for experienced hikers who have a strong level of physical fitness. When setting out on this hike, make sure that you bring at least 4L of water, plenty of snacks, sturdy footwear, and have an adventure pass displayed in your vehicle.

For those adventurers who are able to undertake such a long and difficult journey, the trek up Iron Mountain is one that will certainly leave you feeling accomplished. Breathtaking summit views and an incredible sense of achievement await for those who can conquer “Big Iron”.

Setting out from the trailhead, you will make your way to the northeast along the road for roughly 0.5mi, where you will find toilet facilities and the Heaton Flats Trail branching off to the right. Take this trail and follow it east through the tree cover, where you will begin the long and treacherous climb up to the summit of Iron Mountain.

Here, the trail will bend to the northeast and continue climbing through the rugged terrain for the next 3.6mi, traversing a ridgeline on the way to the Allison Saddle. This is a great place to pause for a rest before making the grueling push up to the summit.

From the saddle, you will keep right at the junction and continue on to the north, working your way up the steep slope of Iron Mountain for the next 2.3mi. There is no doubt about it that this is the most physically demanding portion of the hike, but once you arrive at the summit you will be met with views that make the entire experience worthwhile.

After trudging the last few feet to the top of Iron Mountain, you will have an incredible sightline that extends across the entirety of the Angeles National Forest and the countless peaks of the San Gabriel Range. When you are ready, turn back along the trail and retrace your footsteps to make your descent. Trekking poles will come in handy here, as they provide some stability when traversing the steep and uneven terrain.

Eventually, you will arrive back at the trailhead where you started your long and arduous journey to the summit of Iron Mountain.

Trail Highlights

Iron Mountain

Often referred to as “Big Iron”, Iron Mountain is a remote peak in the San Gabriel Mountains that is known to provide one of the most strenuous day hiking experiences in the region. Rugged, exposed, and relentless, the trail will take you to the top of the 7936ft peak for incredible views of Southern California.