The 27E105 Hartley Loop Single Track Trail in Mammoth Lakes, California, is a hidden gem for outdoor enthusiasts. Whether you’re a seasoned mountain biker or a dedicated hiker, this trail offers a thrilling and diverse experience that immerses you in the rugged beauty of the Eastern Sierra region. Situated within the Mammoth Lakes Basin, the trail provides a chance to experience panoramic vistas, lush meadows, rocky ascents, and technical descents. In this article, we’ll take you through everything you need to know about the 27e105 Hartley Loop Single Track Trail Mammoth, from its terrain and scenic highlights to the best time to visit, tips for your trip, and more.
Overview of the 27e105 Hartley Loop Single Track Trail Mammoth
The 27E105 Hartley Loop is a popular single-track trail located in the Mammoth Lakes area. This trail is often considered moderate to difficult, making it ideal for intermediate to experienced outdoor adventurers. Whether you are a hiker or a mountain biker, this trail provides a fantastic opportunity to challenge your skills while soaking in some of the most picturesque landscapes in the region.
Length and Difficulty
Spanning approximately 9 miles (14.5 km), the trail offers a moderate to challenging experience due to its varied terrain. The trail’s elevation gain is around 500 feet, which may not seem like much, but it’s the rocky and technical sections that really up the ante for those who choose to tackle it.
The terrain includes a blend of smooth paths, rocky sections, and sandy washes, which require good balance and stamina. Riders and hikers will encounter steep climbs, sharp descents, and a few switchbacks that test their endurance. This makes the Hartley Loop a great way to improve your hiking or biking skills.
Trail Conditions
The trail’s conditions can change significantly depending on the time of year. In the warmer months, late spring to early fall, the trail is generally dry, which makes for ideal hiking or mountain biking. The winter months can bring snow and ice to the area, and while this adds a layer of difficulty for those brave enough to visit, it’s crucial to prepare for potentially hazardous conditions.
Scenic Highlights Along the Hartley Loop
One of the main draws of the27e105 Hartley Loop Single Track Trail Mammoth is its variety of scenic viewpoints. Whether you’re hiking or biking, the trail offers a visual feast of natural beauty. From towering pines and alpine lakes to expansive vistas of the surrounding Sierra Nevada mountains, this trail gives you a front-row seat to the diverse landscapes that make Mammoth Lakes a bucket-list destination for outdoor lovers.
Panoramic Views of the Sierra Nevada
The trail provides spectacular panoramic views of the Sierra Nevada mountain range. As you progress along the path, you’ll be treated to ever-changing vistas that show off jagged peaks, lush valleys, and sprawling meadows. The landscape is especially dramatic when viewed in the early morning or late afternoon when the light creates stunning contrasts and shadows on the rugged terrain.
Wildflower Meadows and Lush Forests
The trail passes through lush forests and open meadows, making it a beautiful destination during the warmer months when wildflowers bloom in a riot of colors. These meadows are not just visually appealing—they are also home to a diverse range of wildlife, including birds, squirrels, and deer. If you’re lucky, you may even catch sight of a fox or a bear in the distance.
For nature photographers, the Hartley Loop is a fantastic location to capture the flora and fauna of the Eastern Sierra. The wildflower displays in the spring and summer are particularly vibrant and worth planning for, as they make the hiking experience even more memorable.
Trail Features and Technical Sections

While the trail’s scenic features are a major attraction, it’s the technical sections that really make the 27e105 Hartley Loop Single Track Trail Mammoth stand out. The diversity in terrain ensures that no two miles of the trail feel the same. From wide and easy single-track paths to tight, technical singletrack sections, the loop offers a variety of challenges that cater to experienced hikers and riders.
Steep Climbs and Rocky Descents
The trail is peppered with steep ascents that push your physical limits. The rocky sections can be particularly challenging for mountain bikers, as navigating the loose rocks requires both agility and concentration. On the other hand, the descents offer a thrilling ride for those who enjoy technical downhill biking.
The rocks and dirt sections of the trail may be loose or uneven, so it’s important to stay focused and adjust your pace accordingly. For hikers, walking sticks can be helpful to maintain balance, especially when dealing with the steeper sections of the loop.
Switchbacks and Sharp Turns
The Hartley Loop features a series of switchbacks that climb up the mountainside and can test both bikers and hikers. These sharp turns require skill and control, especially on a bike. It’s easy to lose momentum on the climbs, and the descents can sometimes be a challenge for riders who aren’t used to navigating tight corners at high speeds.
For hikers, these sections provide excellent opportunities to catch your breath while enjoying the views before continuing on.
Previous Article: Gunter16 in the Lab
Best Time to Visit the 27e105 Hartley Loop Single Track Trail Mammoth
The best time to visit the 27E105 Hartley Loop is during the late spring to early fall months, typically between late May and September. During this period, the trail is free from snow, and the terrain is dry, making it ideal for both hiking and mountain biking.
Spring and Summer
In spring and early summer, the surrounding meadows come alive with vibrant wildflowers, and the temperatures are mild, making for perfect conditions. Wildlife sightings are also common in these months, as animals emerge from winter hibernation. Summer is the peak hiking and biking season, so expect to see more visitors, but the well-maintained trail is capable of handling the increased foot and bike traffic.
Fall
In the fall, the trail becomes an even more breathtaking sight as the surrounding trees take on hues of red, orange, and yellow. If you enjoy autumn colors, this is an excellent time to visit, though temperatures can begin to dip, so dressing in layers is recommended.
Tips for Hiking or Biking the 27E105 Hartley Loop
Whether you’re hiking or mountain biking, preparation is key to having a safe and enjoyable experience on the Hartley Loop. Here are some tips to help you make the most of your adventure:
1. Bring Proper Gear
For hikers, comfortable shoes with good tread are essential, as well as trekking poles for balance. For mountain bikers, ensure your bike is equipped for technical terrain, and always wear a helmet and gloves for safety. It’s also advisable to wear appropriate padding if you’re planning to descend rocky or technical sections of the trail.
2. Pack Plenty of Water and Snacks
The 27e105 Hartley Loop Single Track Trail Mammoth can take several hours to complete, depending on your pace and fitness level. Bring plenty of water to stay hydrated and pack high-energy snacks such as trail mix, protein bars, or fruit to fuel your journey. There are no water sources along the trail, so make sure to bring enough to last the entire hike or ride.
3. Know the Trail Conditions
Before heading out, check trail conditions for any closures, snow, or weather-related hazards. The weather in the Mammoth Lakes area can be unpredictable, and it’s important to be prepared for sudden changes. The trail can be slippery or muddy after rain, and snow might linger until late spring in some sections.
4. Respect Trail Etiquette
As with any outdoor trail, it’s essential to follow good trail etiquette. This includes staying on the designated path, yielding the trail to others when appropriate, and leaving no trace by packing out all trash. Additionally, bikers should give hikers the right of way when descending and exercise caution on narrow or technical parts of the trail.
Conclusion
The 27e105 Hartley Loop Single Track Trail Mammoth is a must-visit for outdoor enthusiasts looking to experience the stunning natural beauty of Mammoth Lakes, California. Offering a combination of technical terrain, spectacular views, and a variety of landscapes, the trail provides a unique outdoor adventure for both hikers and mountain bikers. Whether you’re seeking a challenge or simply want to enjoy the serenity of the Sierra Nevada, the Hartley Loop will undoubtedly provide a rewarding experience.
If you’re planning to visit, remember to check the weather, prepare for the terrain, and take your time to fully appreciate the beauty of this incredible trail. From the wildflower-filled meadows to the majestic peaks and rocky descents, the 27E105 Hartley Loop is an unforgettable journey through one of California’s most stunning outdoor destinations.