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- Mount San Antonio
10,064 ft · San Gabriel Mountains, California
Mount San Antonio
Mount San Antonio is a 10,064 ft peak in the San Gabriel Mountains, California. The standard route is the Notch Trail: 10 mi, 3,917 ft of gain, Class 1.
Mount San Antonio at a glance
- Elevation10,064 ft3,067 m
- RouteNotch TrailClass 1
- Distance10 mi3,917 ft gain
- Time7 – 9 hrsHard effort
- SeasonJun – Oct
- RangeSan Gabriel MountainsCalifornia
Climbing the Notch Trail
From the Mount Baldy area above Upland, California, start near Manker Flats in the San Gabriel Mountains to climb Mount San Antonio, better known as Mount Baldy. An Adventure Pass is required to park at Manker Flats. The route reaches the summit via the ski area notch and the airy Devils Backbone ridge, a Class 1 trail with real drop-offs. Expect loose rock, snow and ice lingering into early summer, and cold, windy conditions up high. Storms build quickly, so start early and turn around if weather threatens. Carry traction and an ice axe in shoulder seasons, plus layers and water.
Gear and hazards
What to bring
Backpack (25–35 L)
Hiking Boots
Base Layer
Midlayer
Hardshell Jacket
Sun Hat
Warm Hat
Buff
Midweight Gloves
Trekking Poles
Headlamp
GPS Device
Satellite Communicator
Power Bank
Offline Maps
Water
First-Aid Kit
Sunglasses
Sunscreen
What to watch for
- High altitude
- Loose rock
- Snow near summit
- Ice near summit
- Storms
- High winds
- Cold summit conditions
- Steep exposure
- Rapid weather shifts
- Low visibility
Mount San Antonio on Yak
Climbers have shared 8 climbs of Mount San Antonio on Yak. Read their trip reports and recent conditions in the app
Quests with Mount San Antonio
Lower 48 UltrasFrequently asked questions
How tall is Mount San Antonio?
Mount San Antonio is 10,064 feet (3,067 m) tall. It is in the San Gabriel Mountains, California.
How hard is it to hike Mount San Antonio?
The Notch Trail is Class 1, which means hiking on a trail. Yak rates the overall effort hard: 10 miles with 3,917 feet of elevation gain.
How long does it take to hike Mount San Antonio?
Most people take 7 – 9 hours round trip on the Notch Trail, covering 10 miles with 3,917 feet of elevation gain, so most people do it in a day.
Can a beginner hike Mount San Antonio?
The Notch Trail needs no climbing skills, but it is a hard day: 10 miles with 3,917 feet of elevation gain. Build up on shorter hikes first, start early and carry plenty of water and layers.
What time should you start hiking Mount San Antonio?
Early. Afternoon thunderstorms are common in summer, so aim to be off the summit and the exposed upper mountain by early afternoon.
When is the best time to hike Mount San Antonio?
The usual hiking window is June to October. Outside it, expect snow, storms or closed access, and check the summit forecast before you go.
What is the trailhead elevation for Mount San Antonio?
The Notch Trail starts at about 6,170 feet, roughly 3,894 feet below the summit.
Climb Mount San Antonio with Yak
Plan your route on a topo map, check the summit forecast, then log your climb and see what is left on your list