Pine Mountain via the Acorn Trail

Tucked into the San Gabriel Mountains above the small mountain town of Wrightwood, California, the Acorn Trail to Pine Mountain is one of the most demanding day hikes in Angeles National Forest. The route gains nearly 3,900 feet in under 5 miles one-way — a relentless, sustained climb that rewards the effort with Pacific Crest Trail ridgeline, sweeping views of the high desert and Mojave below, and the kind of solitude you don't usually find this close to Los Angeles.

It's a hike that earns its difficulty rating. If you're training for big mountain objectives or chasing peaks for the Six-Pack of Peaks Challenge, this is a benchmark.

The Trail

• Distance: 9.94 miles out-and-back
• Elevation gain: 3,878 ft
• Difficulty: Strenuous
• Route type: Out-and-back
• Summit: Pine Mountain (~9,648 ft)
• Surface: Dirt singletrack, rocky in upper sections

The Acorn Trail begins quietly at the end of Acorn Drive in Wrightwood and gets straight to work — climbing relentlessly through pine and oak forest with very little flat ground to recover on. After about 2.5 miles of switchbacks and roughly 2,000 ft of gain, the Acorn Trail intersects the Pacific Crest Trail (PCT) along the ridge.

From there, head east on the PCT toward Pine Mountain. The PCT section traverses the spine of the San Gabriels with sweeping views opening up in both directions — the Mojave Desert and Antelope Valley sprawling to the north, and the Cucamonga Wilderness and Inland Empire to the south on clear days.

The final push to the Pine Mountain summit is steep and rocky. The peak itself is a quiet summit with strong views and the satisfying knowledge that you've earned every foot of elevation.

Highlights

• Pacific Crest Trail traverse — bag a section of the PCT without committing to a thru-hike
• Pine Mountain summit at 9,648 ft — one of the higher accessible summits in the San Gabriels
• Views in all directions — Mojave Desert to the north, Inland Empire to the south, Mt. Baden-Powell to the west, Mt. San Antonio (Baldy) further west
• Wildlife: black bears, mule deer, mountain lions (rarely seen), and a variety of raptors riding thermals along the ridge
• Old-growth pine and fir in the upper forest sections — quiet, fragrant, and a welcome contrast to LA below

Difficulty Notes

This is not a beginner hike. The numbers tell the story:

• 3,878 ft of gain over ~5 miles is steeper than most popular SoCal peak hikes
• Sustained climbing — there are almost no flat recovery sections on the way up
• Altitude — the summit sits near 9,650 ft, where the air thins noticeably
• Exposure — much of the upper trail has minimal shade once you hit the PCT ridge

Plan for 6–9 hours at a moderate pace. Trail runners can do it faster; most hikers should plan for a full day.

Seasonal Considerations

• Spring (April–early June): Snow lingers on the upper trail well into spring. Microspikes and trekking poles often required well after Wrightwood has dried out.
• Summer (June–August): Best window for most hikers. Start at dawn — heat is real even at altitude, and afternoon thunderstorms are common.
• Fall (September–October): Ideal — cooler temps, crisp visibility, fewer crowds.
• Winter (November–March): Snow-covered and serious. Suitable only for experienced winter mountaineers with proper gear (snowshoes, axe, possibly crampons). Check current conditions with the Mt. Baldy Ranger District before going.

Fire closures are a recurring issue in Angeles National Forest. Always check current trail and forest status before heading out: fs.usda.gov/angeles.

What to Bring

• Plenty of water — at least 3 liters for a day hike; there's no water on the trail
• Layers — temps can swing 30°F between Wrightwood and the summit, especially in shoulder seasons
• Sun protection — hat, sunscreen, sunglasses
• Sturdy hiking boots — the upper trail is rocky and loose in places
• Trekking poles — your knees will thank you on the descent
• Map / GPS — download Gaia, AllTrails, or similar offline; cell service is spotty
• Snacks/lunch — pack more calories than you think you'll need

Trailhead & Access

• Trailhead: End of Acorn Drive in Wrightwood, CA (approximate address: 931 Finch Road, Wrightwood)
• Parking: Limited street parking near the trailhead — arrive early on weekends
• Adventure Pass: National Forest Adventure Pass required for parking ($5/day or $30/annual) — purchase in advance at REI or any USFS office
• Restrooms: None at the trailhead — use facilities in Wrightwood before starting
• Dogs: Permitted on leash, but the distance, elevation, and exposed terrain are tough on dogs. Bring extra water for them.

Practical Info

• Nearest town: Wrightwood, CA (right at the trailhead) — coffee, food, gear shops in town
• From LA: ~1.5 hours via I-15 and Highway 138
• Pair with: Mt. Baden-Powell (9,407 ft, ~8 miles round trip) or Mt. Baldy further west for a multi-day Wrightwood peaks trip
• Post-hike: The Grizzly Cafe and Mile High Pizza in Wrightwood are local favorites for a big post-hike meal
• Six-Pack of Peaks: Pine Mountain isn't on the official challenge but pairs well with nearby Baden-Powell which is