Overview
Mount San Antonio — universally known as Mount Baldy — is the highest peak in Los Angeles County, reaching approximately 10,064 feet (3,068 m) above sea level. It sits within the San Gabriel Mountains in the Angeles National Forest and draws hikers, skiers, and day-trippers from the broader Los Angeles metro area year-round.
Despite the informal name 'city' sometimes attached in searches, Mount San Antonio is not an incorporated municipality. The surrounding area includes the small community of Mount Baldy Village, a cluster of cabins, a few local restaurants, and trailhead access points. Most visitors arrive as day-trippers from nearby cities such as Upland, Claremont, or Pomona.
The mountain offers a genuine high-alpine experience surprisingly close to a major urban center. On clear days, hikers at the summit can see across the Los Angeles Basin, out to Catalina Island, and on exceptional days as far as San Nicolas Island. This combination of accessibility and dramatic elevation change makes it one of the most climbed peaks in California.
Before You Go
Permits and Fees
Angeles National Forest requires a valid Adventure Pass or equivalent interagency pass to park at most trailheads. Verify current fee requirements and pass types on the Angeles National Forest official website or at the forest service ranger station before your visit, as rules and fees change periodically.
Seasonal Considerations
- Winter (December–March): Snow is common above 6,000 feet. Roads into the area, including the road to Mount Baldy Village, can be closed or require chains on short notice. Check Caltrans road conditions and the Angeles National Forest advisory pages before departing.
- Spring (April–May): Snow lingers on upper slopes; trails may be muddy. Extra traction devices (microspikes or crampons) are often needed into May.
- Summer (June–September): The most reliable window for summit hikes. Afternoon thunderstorms can develop quickly; start early and be off exposed ridges by midday.
- Fall (October–November): Cooler temperatures, good visibility, and lighter crowds. Early-season snow is possible.
Wilderness Preparedness
Bring the Ten Essentials: navigation tools, sun protection, insulation, illumination, first-aid supplies, fire-starting equipment, repair tools, nutrition, hydration, and an emergency shelter. Cell coverage is unreliable in the backcountry. Inform someone of your plans before heading out.
Getting There
By Car
The most practical way to reach Mount Baldy is by private vehicle. From the Los Angeles Basin, take the 10 Freeway to the Mountain Avenue exit in Upland, then follow Mountain Avenue north, which becomes Mount Baldy Road. The drive from central Los Angeles takes roughly 45–60 minutes under normal conditions. Parking is available at several trailheads along the road and near Mount Baldy Village; verify current parking areas and any temporary closures locally.
By Public Transit
Foothill Transit (verify current routes and schedules at foothilltransit.org) has historically served the Claremont area, and a limited seasonal bus service has been operated to the Mount Baldy area. Transit options are limited and infrequent; verify current service before relying on this option.
Nearest Airports
- Ontario International Airport (ONT): Approximately 15–20 miles from the mountain; the most convenient option.
- Los Angeles International Airport (LAX): Approximately 60–70 miles west; accessible but involves navigating significant freeway traffic.
Getting Around
Within the Mount Baldy area, a private vehicle is essentially required. Mount Baldy Road is the main corridor, connecting trailheads, the ski area, and the village. There are no local bus routes circulating between points of interest.
The Mount Baldy Ski Lifts operate chair lifts during the ski season and have historically offered lift-assisted access to the upper mountain during summer months for hikers (the so-called 'Ski Hut' approach). Verify current lift operating status, hours, and fees directly with Mount Baldy Ski Lifts before your trip, as operations vary by season and snow conditions.
Where to Stay
Accommodation directly in the Mount Baldy area is sparse. The village has historically offered a small lodge and a handful of rental cabins; availability is limited and advance booking is advisable for weekend visits. Verify currently operating properties on booking platforms before planning.
Most visitors find it practical to stay in the nearby cities of Claremont, Upland, Pomona, or Rancho Cucamonga, all of which have a broader selection of hotels at various price points and are within a 30–45 minute drive of the trailheads. Verify availability and rates directly with accommodation providers.
Things to See & Do
Hiking
The mountain offers trails across a wide range of difficulty levels.
- Devil's Backbone Trail: The most popular summit route. Starting from the top of the ski lift (or from Manker Flats trailhead), this trail follows a dramatic ridge to the summit. Round-trip distance and elevation gain vary depending on starting point; verify trail conditions at the ranger station.
- San Antonio Falls Trail: A short, accessible walk from Manker Flats parking area to a year-round waterfall. Suitable for families and those not seeking a summit attempt.
- Bear Canyon and other backcountry routes: Longer, less-trafficked options within the Angeles National Forest. A topographic map and navigation experience are recommended.
Skiing and Snowboarding
Mount Baldy Ski Lifts is a small, historic ski area operating on the mountain's north-facing slopes. It caters primarily to intermediate and advanced skiers. Verify current season dates, lift ticket prices, and snow conditions directly with the resort before visiting.
Snowplay
During winter, lower slopes of the San Gabriel Mountains near the Mount Baldy Road corridor attract families for sledding and snowplay. Check Angeles National Forest guidelines for designated snowplay areas, as restrictions apply in certain zones to protect vegetation and ensure safety.
Wildlife and Nature
The area supports mule deer, black bears, mountain lions, and diverse bird species. Observe wildlife from a distance and store food properly. Bears are active; bear canisters or hang bags are recommended for overnight trips.
Food & Drink
Dining options in the Mount Baldy Village area are limited. The village has historically supported a small number of local establishments — including a lodge and a couple of casual eateries — but hours and operations fluctuate seasonally. Verify what is currently open before arriving and plan to be self-sufficient.
Practical tip: Pack your own food and water for any hike. Water sources on the mountain should be treated before drinking. There are no convenience stores or grocery markets in the village itself; stock up in Upland, Claremont, or Pomona before driving up the mountain.
Practical Information
Emergency Services
Angeles National Forest is a wilderness environment. In a genuine emergency, call 911. Cell service is unreliable above the village; emergency calls may not connect. The Los Angeles County Sheriff's Department and U.S. Forest Service coordinate search and rescue in the area. Filing a trip plan with a trusted contact is strongly recommended.
Weather Information
Check the National Weather Service forecast for the San Gabriel Mountains (weather.gov) before any visit. Mountain weather changes rapidly and conditions at the summit can differ dramatically from those in the valley below.
Leave No Trace
The San Gabriel Mountains experience heavy visitor pressure relative to their size. Pack out all waste, stay on designated trails, and avoid trampling fragile alpine vegetation above the treeline. Campfires are restricted or prohibited in much of the Angeles National Forest; check current fire restrictions at the forest service website before any overnight trip.
Altitude
At over 10,000 feet, some visitors — particularly those arriving directly from sea level — may experience mild symptoms of altitude adjustment including headache or shortness of breath. Hydrate well and pace yourself.
Safety
Mount San Antonio presents genuine backcountry hazards that visitors must take seriously.
- Weather: Lightning strikes are a real risk above the treeline in summer. Begin summit attempts early (before dawn is common among experienced hikers) and descend before midday thunderstorms develop.
- Winter conditions: Ice and snow on the Devil's Backbone ridge can make hiking treacherous without crampons and an ice axe. Several serious accidents have occurred on this route in icy conditions; do not underestimate winter terrain.
- Navigation: Trails can be obscured by snow in winter. A downloaded offline map (e.g., from CalTopo or Gaia GPS) and a compass are advisable.
- Wildlife: Black bears are present. Store food in a bear canister or approved container; do not leave food in vehicles overnight. Mountain lion encounters are rare but possible; know how to respond (stand tall, do not run, make yourself look large).
- Sun exposure: High elevation and reflective snow significantly increase UV intensity. Use high-SPF sunscreen, sunglasses, and a hat.
