Highlight • Mountain Pass
Road cycling
5.0
(2)
Cycling
5.0
(1)
Onyx Summit is a prominent mountain pass nestled in the San Bernardino Mountains, within the southwestern part of San Bernardino County, California. Standing at an elevation of 8,443 feet (2,573 meters), it holds the distinction of being the highest paved mountain pass in Southern California. This significant landmark is traversed by California State Route 38, a scenic highway that winds through the eastern section of the San Bernardino National Forest, connecting the forested highlands near Big Bear Lake with the lower desert regions.
Visitors are consistently drawn to Onyx Summit for its breathtaking panoramic views, which often include glimpses of majestic peaks like San Gorgonio Mountain and the vast desert landscape to the east. The clear, dark skies at this high elevation make it an exceptional spot for stargazing, offering unparalleled celestial observations away from city lights. For many, the sense of achievement after cycling the challenging ascent or accessing the iconic Pacific Crest Trail from this point adds to its allure.
Before heading to Onyx Summit, it's wise to prepare for varying conditions. While generally accessible via Highway 38, winter months can bring snow, necessitating snow chains for safe travel. Facilities at the summit are limited, so it's advisable to bring your own water and snacks. The terrain around the pass can be rugged, especially if venturing onto trails, so sturdy footwear is recommended for hikers exploring the area.
The best time to visit Onyx Summit largely depends on your planned activities. Spring through fall offers ideal conditions for hiking, rock climbing at the nearby Onyx Summit Crag, and cycling, with pleasant temperatures and clear skies. During these months, the scenic drive along Highway 38 provides stunning mountain vistas. For those seeking winter adventures, the snow-covered landscape offers a different kind of beauty, though road conditions require careful attention.
Many outdoor enthusiasts find Onyx Summit to be a gateway to adventure. Hikers can access the renowned Pacific Crest Trail directly from the pass, embarking on challenging long-distance treks or shorter conditioning walks. Cyclists frequently tackle the climb to Onyx Summit, recognizing it as one of Southern California's longest and highest ascents. The area also provides opportunities for rock climbing and photography, capturing the dramatic mountain scenery.
Exploring the diverse trails and routes around Onyx Summit is made easy with digital planning tools. Whether you're looking for a challenging climb, a scenic drive, or a peaceful spot for stargazing, you'll find a variety of options. Hikers, cyclists, and trail runners can discover detailed routes and plan their next adventure using komoot, ensuring they make the most of this remarkable Southern California mountain pass.
This Highlight is in a protected area
Please check local regulations for:
Tips
November 27, 2023
Road cycling

In the know? Log-in to add a tip for other adventurers!
Sign up for free
Nearby routes
Best routes near Onyx Summit

5.0
(1)
101
riders
85.6km
04:02
1,140m
1,140m
This difficult 53.2-mile road cycling route from Snow Valley to Onyx Summit via Big Bear Lake offers challenging climbs and alpine scenery.

31
riders
101km
05:50
2,260m
2,260m
This difficult 62.6-mile road cycling route from Mill Creek Visitors Center to Onyx Summit offers a challenging climb and alpine views.

5.0
(1)
36
riders
80.1km
03:43
870m
870m
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.
Details
Informations
Elevation 2,570 m
Weather
Powered by Foreca
Today
Friday 26 June
27°C
12°C
0 %
Additional weather tips
Max wind speed: 6.0 km/h
Most visited during
January
February
March
April
May
June
July
August
September
October
November
December
Onyx Summit is the mountain pass traversed by Highway 38, marking the highest paved point in Southern California. Onyx Peak, on the other hand, is a distinct nearby peak that can be hiked from the summit area, offering additional panoramic views. While related geographically, they are separate features.
Yes, Onyx Summit serves as a significant access point for the renowned Pacific Crest Trail (PCT). Hikers can embark on challenging long-distance treks or shorter conditioning walks from this location. Additionally, the area around the summit offers various routes for cycling and exploring the natural surroundings.
Parking is generally available along Highway 38 near the summit, though it can be limited, especially during peak seasons. Arriving earlier in the day is often recommended. Public transport options to Onyx Summit are very limited, making private vehicle access the most common and practical way to reach the pass.
Onyx Summit can be visited in winter, offering a beautiful snow-covered landscape. However, winter conditions require careful attention. Highway 38 may necessitate snow chains for safe travel, and facilities are limited. Always check road conditions before heading out during colder months.
While the immediate summit area is primarily a pass, the surrounding San Bernardino National Forest offers various trails and areas that can be enjoyed by families and dogs. When hiking with dogs, always ensure they are on a leash and that you adhere to all park regulations. Some trails may be more strenuous, so choose routes appropriate for all family members and pets.
Due to its location within the San Bernardino National Forest, Onyx Summit is home to diverse wildlife. Visitors might spot various bird species, deer, and smaller mammals. Keep an eye out for signs of larger animals, though direct encounters are less common. Always observe wildlife from a respectful distance and do not feed them.
Yes, just northwest of the summit, accessible from Highway 38, is the Onyx Summit Crag. This small rock climbing area features over twenty routes of varying difficulty on high-quality granite, mostly bolted sport routes. It's suitable for climbing from spring through fall.
Given the high elevation and varying conditions, it's wise to pack layers of clothing, even in summer, as temperatures can change rapidly. Sturdy footwear is recommended for any trail exploration. Always bring sufficient water, snacks, sun protection (hat, sunscreen), and a map or GPS device. In winter, add warm clothing, gloves, and potentially snow chains for your vehicle.
Onyx Summit itself is a mountain pass with very limited facilities. There are no cafes, pubs, or direct accommodation options at the summit. For amenities, visitors would need to travel to nearby towns such as Big Bear Lake or other communities within the San Bernardino Mountains or down towards the desert regions.
The climb to Onyx Summit is considered a popular and challenging cycling route. It's recognized as one of the longest and highest ascents in Southern California, featuring significant elevation gain over many miles. Cyclists should be well-prepared for a strenuous ride.
Onyx Summit's high elevation of 8,443 feet (2,573 meters) and its distance from major city lights contribute to exceptionally clear and dark skies. This makes it an ideal location for observing celestial phenomena and enjoying unparalleled stargazing opportunities away from light pollution.