Mt Wilson Trail Hiking Guide
The Mt Wilson Trail is one of the most storied climbs in the San Gabriel Mountains, ascending 4,500 feet from the quiet foothill city of Sierra Madre to the 5,710-foot summit above Los Angeles. At 14 miles round trip, this strenuous out-and-back demands solid fitness and solid preparation, but rewards both with panoramic views of the LA Basin, a look at the historic Mt Wilson Observatory, and a genuine sense of accomplishment. The trail has been used by mountaineers and foot-racers for well over a century, making every step feel earned.
Trail Overview and Route Description.
The trail begins at Mater Dolorosa Retreat Center on Siera Madre Boulevard, where a small parking area and clear signage mark the start. From the trailhead, the route climbs steadily through coastal sage scrub and chaparral before entering a shaded canyon section alongside Winter Creek. After crossing the creek several times in the lower miles, the trail steepens considerably as it gains the exposed ridgeline. The final push to the summit plateau passes through pine and oak forest before opening onto the Mt Wilson Skyline Park area, where the observatory domes and broadcast towers come into full view. The descent retraces the same route, so tired legs on the return downhill are part of the experience.
Summit Views and Observatory
Standing at the summit of Mt Wilson on a clear day, hikers look south across the entire Los Angeles Basin, with downtown skyscrapers visible roughly 25 miles away and Catalina Island appearing on the horizon beyond. To the north, the higher San Gabriel peaks — including Mt Baden-Powell and Mt San Antonio (Mt Baldy) — form an impressive ridgeline. The Mt Wilson Observatory, operated by the Carnegie Institution, sits just steps from where the trail crests the summit plateau. While the telescopes themselves require a separate visit to tour, their domes are a striking visual landmark and a reminder that this mountaintop has drawn scientists and adventurers alike for more than 100 years.
Permits, Fees, and Access
No permit is required to hike the Mt Wilson Trail from the Sierra Madre trailhead. The trail itself passes through the Angeles National Forest, but because the primary access point originates at the city-side trailhead in Sierra Madre, hikers are not required to display an Adventure Pass for parking at the Mater Dolorosa lot. If you choose to park elsewhere along Sierra Madre Boulevard or access via the forest, verify current Adventure Pass requirements with the Angeles National Forest, as these can change seasonally. The road to the summit via Angeles Crest Highway may have seasonal closures after winter storms, but the foot trail remains accessible year-round from the Sierra Madre side.
Best Seasons and Conditions
Spring and fall are the most rewarding seasons for this hike. Spring brings wildflower blooms in the chaparral belt, mild temperatures in the 55–70°F range at the trailhead, and frequent good visibility after winter rains clear the air. Fall delivers crisp temperatures, golden light, and some of the year's best air clarity for long-distance summit views. Summer hiking is possible but demanding: temperatures at the lower elevations can exceed 90°F by mid-morning, and the exposed ridge sections offer no shade. If you hike in summer, a very early start — before 6 a.m. — is essential. Winter brings the possibility of ice and snow above 4,000 feet; microspikes and layers are advisable after any storm system.
Safety Considerations
With 4,500 feet of elevation gain spread across 7 miles of uphill travel, the Mt Wilson Trail punishes under-prepared hikers regularly. Carry at minimum 3 liters of water per person — there are no reliable water sources on the trail. Notify someone of your itinerary and expected return time before you leave the trailhead. The descent is long and knee-intensive; trekking poles provide meaningful relief on the way back down. Cell service is intermittent on the lower canyon sections but generally returns near the summit. Dogs are welcome but must be kept on leash, and the sustained climbing can tire pets quickly, so pack water for them as well. Turn around if weather deteriorates; afternoon thunderstorms are possible in late summer.
Trailhead Logistics and Parking.
The Sierra Madre trailhead is located at the end of Mt Wilson Trail Road, just past Mater Dolorosa Retreat Center on the north end of Sierra Madre. Street parking is available along the residential blocks below the trailhead, and a small dirt lot sits at the trail register. Arrive by 7 a.m. on weekends to secure a spot — this trail draws a dedicated local following and fills quickly on clear spring and fall mornings. The nearest restrooms are at the city park a few blocks south of the trailhead. There is no fee for parking on the street. The trailhead is approximately a 30-minute drive from Pasadena and about 45 minutes from central Los Angeles without traffic.
Hiking tips for Mt Wilson Trail
- Start no later than 7 a.m. on weekends to beat crowds and secure street parking near the Sierra Madre trailhead.
- Carry at least 3 liters of water per person — there are no reliable water sources along the entire 14-mile route.
- Bring trekking poles to protect your knees on the long, steep descent, which gains roughly 4,500 feet back down to the trailhead.
- Check current trail conditions on the Angeles National Forest website before heading out, especially after winter storms that can leave ice on the upper ridge.
- Dogs must be leashed for the entire trail; pack an extra liter of water for your pet and monitor them on the exposed ridge sections in warm weather.
Nearby trails to explore
- Chantry Flat to Sturtevant Falls.
- Bailey Canyon Trail
- Kenyon Devore Trail to Mt Wilson.
Hike this trail with TrailMates
Tackling a strenuous 14-mile climb like Mt Wilson is more fun — and safer — with the right group. Use TrailMates to find hikers near Sierra Madre who match your pace and fitness level, plan a summit day with a verified group, and take advantage of TrailMates' built-in safety features so someone always knows you're on the trail.