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United States
Idaho
Custer County

Lost River Range

The best walks and hikes in the Lost River Range

5.0

(2)

64

hikers

23

hikes

Hikes in the Lost River Range explore Idaho's highest and most rugged mountain range, located within the Salmon-Challis National Forest. The region is characterized by its high-elevation peaks, deep valleys, and remote wilderness terrain. Trails often lead to alpine lakes and feature significant elevation gain, providing options for both demanding and more moderate outings.

Best hiking trails in the Lost River Range

  • The most popular hiking route is Borah Peak Trail — Salmon-Challis National Forest, a 7.9 mile (12.7 km) trail that takes about 8 hours 34 minutes to complete. This is a challenging hike to Idaho's tallest mountain.
  • Another top favourite among local hiking enthusiasts is Bear Creek Lake — Lost River Range, a moderate 4.6 mile (7.5 km) path. The route ascends through the landscape to reach an alpine lake.
  • Local hiking enthusiasts also love the Lower Cedar Creek Falls — Salmon-Challis National Forest, a 3.1 mile (5.0 km) trail leading through the forest to a waterfall, often completed in about 1 hour 33 minutes.
  • Hiking in the Lost River Range is defined by its high alpine lakes, steep ascents to prominent peaks, and forested valleys. The trail network provides challenging hikes for experienced adventurers as well as easier routes for those seeking less strenuous days.
  • The routes in the Lost River Range are highly rated by the komoot community with an average score of 5.0 stars from a small number of reviews. More than 60 hikers have used komoot to explore the Lost River Range's varied terrain.

Last updated: June 23, 2026

5.0

(1)

28

hikers

#1.

Borah Peak Trail

11.6km

07:29

1,320m

1,320m

Embark on the Borah Peak Trail for a truly demanding hiking experience, leading you to Idaho's highest point. This difficult route spans 7.2 miles (11.6 km) and challenges you with a significant 4336 feet (1322 metres) of elevation gain, typically taking around 7 hours and 29 minutes to complete. You will begin your ascent through wooded areas dotted with sagebrush and Bristlecone Pines, transitioning to a rocky path above the treeline that opens up to expansive 360-degree views of the Lost River Range and Pioneer Mountains.

For a successful summit, plan your visit for late summer or early autumn when snow has largely melted, as early season conditions, particularly on Chicken-Out Ridge, might necessitate mountaineering gear. Starting your hike early in the morning is highly recommended to avoid both weekend crowds and the potential for afternoon thunderstorms. Be aware that this trail is popular, especially on weekends, so an early start also helps secure parking and a more serene experience.

The Borah Peak Trail is renowned for its infamous Chicken-Out Ridge, a Class 3/4 scramble that presents a thrilling and memorable challenge on your way to the top. This section requires careful navigation and a head for heights, rewarding you with unparalleled vistas from the summit across Idaho's vast mountainous landscape. It is a defining feature that sets this climb apart, making it a bucket-list hike for many experienced adventurers.

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Hard

5.0

(1)

26

hikers

12.7km

08:34

1,540m

1,540m

Embark on the Borah Peak Trail, a challenging hike that takes you through varied terrain to Idaho's highest point. You will cover 7.9 miles (12.7 km) with a significant elevation gain of 5038 feet (1536 metres), a journey estimated to take around 8 hours and 34 minutes. The route begins with a steep climb through a wooded valley before transitioning to rocky landscapes, culminating in the technical scramble across Chicken Out Ridge, which offers exposed views before the final push to the summit. This difficult trail promises a demanding yet rewarding experience for seasoned hikers.

Planning your ascent requires careful consideration, as the best time to hike Borah Peak Trail is typically from late June to early September when snow conditions are optimal. Attempting the route earlier in the season may necessitate specialized mountaineering gear like an ice axe and crampons due to lingering snow and ice. No permits are required for this hike, but always check local conditions before you go to ensure a safe and enjoyable trip. Be prepared for a full day on the mountain, starting early to allow ample time for the climb and descent.

Borah Peak stands as a prominent landmark within the Salmon-Challis National Forest, offering unparalleled 360-degree panoramic views of the Lost River Range and the surrounding wilderness from its summit. This trail is renowned for its rugged beauty and the sense of accomplishment it provides. The unique geological features and the sheer scale of the landscape make it a standout experience for anyone looking to conquer a high-altitude challenge in the region.

Hard
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5

hikers

Embark on an easy 3.1-mile (5.0 km) hike along the Lower Cedar Creek Falls Trail, a scenic route that winds through a craggy canyon. You will gain 623 feet (190 metres) in elevation, with an estimated duration of 1 hour and 32 minutes. The highlight of this journey is the unique "Hole in the Rock" waterfall, where water dramatically emerges directly from a cliff face, offering a memorable visual anchor for your adventure.

When planning your visit, be aware that while the trail is generally accessible, some sections can be poorly marked. It is a good idea to download a GPS track before you head out to ensure you stay on course. For the most impressive views of the waterfall, consider visiting during the spring months when snowmelt significantly increases the water flow. Remember that much of the route is exposed to the sun, so bring adequate sun protection.

This trail is nestled within the Salmon-Challis National Forest, an area known for its diverse landscapes and potential for wildlife sightings. Beyond the distinctive waterfall, you might spot various local wildlife and wildflowers, especially as summer approaches. The natural setting provides a refreshing escape, making it a notable option for a straightforward outdoor experience in the region.

Easy

2

hikers

7.45km

02:42

480m

480m

Discover the Bear Creek Lake Trail, a moderate hiking route that leads you through tree-lined meadows and rugged terrain. This 4.6-mile (7.5 km) journey involves a climb of 1584 feet (483 metres), typically taking around 2 hours and 42 minutes to complete. You will find yourself in a glacial basin, where the sound of pikas might accompany your steps, before reaching the stunning alpine lake with its turquoise waters and impressive bluffs.

Planning your visit requires some preparation for this remote area. The road to the trailhead is rough, so you should use a vehicle with high ground clearance to access it. Cell coverage is sparse, so remember to download a GPS map for navigation before you head out.

This trail offers a rewarding backcountry experience within the Salmon-Challis National Forest. As you hike, keep an eye out for deer in the woodlands, and enjoy the panoramic views of craggy ridges and the Lost River Mountains that unfold around you.

Moderate

1

hikers

5.97km

02:15

420m

420m

Embark on the Merriam Lake Trail, a moderate hike spanning 3.7 miles (6.0 km) with an elevation gain of 1370 feet (417 metres). You can expect to complete this route in about 2 hours and 14 minutes. The journey begins in lush meadowlands, gradually ascending into a subalpine forest. As you climb, the terrain becomes steeper, leading to exposed sections that offer expansive views of the Lost River Mountains. The trail culminates at Merriam Lake, a striking blue pool nestled among towering granite bluffs, where you might even spot natural waterfalls.

Access to the Merriam Lake Trail is convenient, with parking available at the West Fork Upper Pahsimeroi Trailhead. When planning your visit, be ready for changing weather conditions, as afternoon altitude storms can occur. It is wise to seek cover if such weather develops. While officially rated moderate, some hikers consider the climb to be strenuous, so ensure you are prepared for a challenging ascent.

This route is situated within Idaho's vast Salmon-Challis National Forest, an area known for its rugged beauty and diverse ecosystems. The varied terrain, from verdant meadows to subalpine forests and exposed mountain sections, showcases the natural grandeur of this region. The final destination, Merriam Lake, provides a serene reward, reflecting the towering granite formations that define this part of the Lost River Mountains.

Moderate

1

hikers

Prepare for a demanding ascent on the Mount Church and Donaldson Peak Trail, a difficult hike that covers 7.6 miles (12.3 km). You will conquer a significant 4932 feet (1503 metres) of elevation gain, typically requiring about 6 hours and 11 minutes to complete. As you climb, the terrain becomes increasingly rugged, leading you through the dramatic Lost River Range. The experience is defined by the striking verticality of Mount Church and Donaldson Peak themselves, with sweeping vistas opening up to reveal surrounding summits like Leatherman Peak and Mount Breitenbach. Look for a distinctive natural arch tucked into the saddle between the two main peaks, a unique feature along this challenging route.

This strenuous trail demands careful planning and preparation. Expect sections with unstable rock, and be ready for difficult route finding, especially on exposed ridge sections. A helmet is highly recommended due to the potential for rockfall, and you should be aware that snow and ice can make the ridge particularly treacherous during certain seasons. Always check current conditions before you go, and ensure you have adequate navigation skills and gear for a high-alpine environment.

This route stands out for its raw, untamed beauty within Idaho's Salmon-Challis National Forest. The unique geological formations of the Lost River Range, with their impressive sheer faces, make this a distinctive high-country adventure. It offers a true wilderness experience, far from developed areas, allowing you to immerse yourself in the solitude and grandeur of the Idaho mountains. This trail is a prime example of the challenging and rewarding hiking opportunities available in this remote region.

Hard

1

hikers

11.1km

03:40

560m

560m

Embark on the Pass Lake Trail, a moderate hike that takes you deep into the rugged Lost River Range within the Salmon-Challis National Forest. This route covers 6.9 miles (11.1 km) and involves a steady climb of 1822 feet (555 metres) as you follow a singletrack path. The journey culminates at the serene Pass Lake, offering a rewarding destination after approximately 3 hours and 40 minutes of hiking. As you ascend, the trail gradually steepens, building anticipation for the views and natural beauty awaiting you at the lake.

Planning your visit is straightforward, as parking is available directly at the West Fork Upper Pahsimeroi Trailhead. This trail is known for being less crowded, so you can often enjoy a quieter experience with lighter foot traffic. If you like to bring your furry friend along, you'll be pleased to know that the Pass Lake Trail is dog friendly, making it a great option for you and your canine companion. Consider starting early to make the most of your time on the path.

The area around Pass Lake is a haven for nature enthusiasts, providing excellent opportunities for birding and spotting local wildlife. Keep an eye out for various species that call this high-mountain environment home. During the autumn months, the landscape transforms with vibrant fall colors, adding another layer of beauty to your hike. The diverse flora along the trail also makes it a great spot to observe wildflowers, especially when they are in bloom.

Moderate

Embark on the Leatherman Peak Loop, a difficult 8.4-mile (13.5 km) hike that challenges you with 4963 feet (1513 metres) of elevation gain over an estimated 6 hours and 27 minutes. The route begins by winding through a wooded area next to a clear creek before opening up into a wide clearing. From this point, you'll see Leatherman Pass clearly, with Leatherman Peak standing tall to your left. The climb then takes you into a cirque, followed by steep sections of scree and talus, leading to rugged Class 3 terrain as you approach the summit.

To reach the trailhead on Sawmill Gulch Road (FS-411), you will need a high-clearance vehicle; a 4x4 is even better because of the road's rough state. This is a very strenuous and challenging hike, so be ready for steep, loose scree and talus, especially higher up the mountain. Good route-finding skills are crucial for this adventure. Starting your hike early in the day is highly recommended to ensure you have enough time to complete the demanding loop safely.

This trail leads you to Idaho's second-highest peak, offering a truly rewarding adventure for experienced hikers. From the summit of Leatherman Peak, you will be treated to expansive views of Borah Peak, Mount Idaho, White Cap Peak, and the vast Lost River Range. You can also spot Pass Lake shimmering below, adding to the scenic reward after your strenuous climb.

Hard

3.28km

01:21

280m

280m

Embark on an easy hiking adventure along the Natural Arch Trail, a 2.0-mile (3.3 km) route that guides you to a remarkable geological formation. You will gain 905 feet (276 metres) in elevation, typically completing the journey in about 1 hour and 20 minutes. The trail offers a pleasant experience through forest scenery, leading you directly to the impressive King Mountain Natural Arch.

When planning your visit, you will find parking readily available at the trailhead, making access straightforward. The initial sections of the path are paved, and there is a dedicated accessible overlook, ensuring a comfortable experience for many visitors. Rangers meticulously maintain the area, contributing to a well-kept and enjoyable environment for your hike.

This trail is notable for its massive King Mountain Natural Arch, which stretches 100 feet across and rises nearly 50 feet above the forest floor, showcasing the region's unique red rock formations. As you hike, you will encounter scenic overlooks that provide expansive views of the surrounding forest. In spring, you might also spot various wildflowers adding color to the landscape.

Easy

Embark on the Lost River Mountain Super Gully Trail, a difficult hiking route that challenges you with a relentless 4226 feet (1288 metres) of elevation gain over just 4.5 miles (7.2 km). This demanding ascent, estimated to take 4 hours and 32 minutes, carves its way up the southwest face of Lost River Peak. You will experience rugged high-alpine scenery, passing through unique sections like the

Hard
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Tips from the Community

Zachary
July 23, 2023, Pass Lake

Pass Lake rests beneath White Cap Peak and is an absolutely beautiful alpine destination. The trail to Pass Lake may be difficult to follow once you get above treeline, but if you come prepared the hike is well worth it.

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Don't follow google maps to the trailhead — the area is well marked and signs will point you in the right direction starting from Bar Rd. You will pass lots of cattle on the way in. The trail is gradual almost the entire way with a short steep sections near the falls. It is rocky in places but you can complete the hike comfortably wearing shoes. This is a popular hike suited for all ages.

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The falls come directly out of the mountain and are stunning any time of year. The lower falls has a bench, but the upper falls is spectacular and well worth the extra effort.

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If the official trailhead to Bear Creek Lake is not accessible, you can park near the fork in the road. You should be able to make it to the fork with a capable SUV. From there follow the trail that climbs steeply (not the creekside trail) from there for a few extra miles. The trail will likely have two large snowfields through midsummer and a couple creek crossings, but the view of the mountains is well worth it.

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Zachary
July 22, 2023, Bear Creek Lake

Bear Creek Lake is a small lake situated amongst the stunning towering peaks of the Lost River range. The trail to the lake may have snow through midsummer, but crampons are not necessary.

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King Mountain natural arch is 80 feet high and made of limestone. The trail leads through mahogany and Douglas fir to ascend to a viewing platform.

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The parking area at the trailhead is fairly small and there are no restrooms or water, so plan accordingly! The trail up to the natural arch is somewhat steep but the views of the arch are spectacular. The trail is clear of snow May through October.

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Zachary
July 22, 2023, Leatherman Peak

Leatherman Peak is the second highest peak in Idaho at over 12,200 ft. It is named after Henry Leatherman, a pioneer from the 1860's. From the top you get spectacular views of the Lost River range.

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Frequently Asked Questions

Are there any easy, family-friendly hikes in the Lost River Range?

Yes, while the range is known for its rugged peaks, there are some easier options. For a shorter walk to a scenic feature, consider the hike to the Natural Arch. It's a relatively short 2-mile (3.2 km) trail that is suitable for most skill levels.

I'm looking for a challenging hike. What do you recommend?

The Lost River Range is famous for its demanding climbs. For a true test of endurance with significant elevation gain, the ascent of Lost River Mountain is a formidable option. This difficult 4.5-mile (7.2 km) route involves a very steep climb to the summit.

Are there any hikes that lead to a waterfall?

Absolutely. The trail to Lower Cedar Creek Falls is a great choice. It's an easy 3.1-mile (5.0 km) hike through the forest that leads directly to the waterfall, making for a rewarding destination.

What are some good options for multi-day backpacking trips?

The remote nature of the range is perfect for backpacking. A great objective is the hike to Pass Lake. This moderate 6.9-mile (11 km) trail takes you to a pristine alpine lake, offering excellent opportunities for secluded camping.

How difficult is the hike to Borah Peak?

The hike to Borah Peak, Idaho's highest point, is extremely challenging and should only be attempted by experienced and well-prepared hikers. The route involves significant elevation gain and a famous, exposed scramble known as Chicken Out Ridge, which requires confidence with heights and basic climbing skills.

Are there bears or other large wildlife in the Lost River Range?

Yes, the region is home to a variety of wildlife, including black bears, mountain goats, bighorn sheep, and mule deer. It is essential to be bear-aware. Store your food securely, especially when camping overnight, make noise while you hike to avoid surprising animals, and carry bear spray and know how to use it.

What is the best time of year to hike in the Lost River Range?

The primary hiking season is from July to September. Due to the high elevation, snow can linger on trails and peaks well into the summer, and early-season snow can begin in the fall. Always check weather forecasts and trail conditions before you go, especially for high-altitude routes.

How many hiking trails are available in the Lost River Range?

There are over 20 hiking routes to explore in the Lost River Range on komoot. These range from difficult mountaineering expeditions to moderate hikes to alpine lakes and easier walks in the valleys.

What should I wear or pack for a day hike here?

Weather can change rapidly in the mountains. It's crucial to dress in layers and pack for a variety of conditions.

Essentials include sturdy hiking boots, a waterproof jacket, extra warm layers, a hat, and gloves. Also, be sure to bring plenty of water, high-energy snacks, a map, a compass or GPS device, a headlamp, and a first-aid kit. Many trails are remote and poorly signed, so self-sufficiency is key.

Are there any circular or loop hikes available?

Yes, for a very challenging loop, you can consider the Leatherman Peak Loop. This is a strenuous 8.4-mile (13.5 km) route with major elevation gain, best suited for experienced mountaineers looking for a full-day adventure.

What are some good hikes to alpine lakes?

The range is dotted with beautiful alpine lakes. Besides the popular Bear Creek Lake, the Merriam Lake Trail is a fantastic moderate option. This 3.7-mile (6.0 km) hike leads to a picturesque lake nestled beneath the high peaks.

What do other hikers enjoy about the Lost River Range?

The area is highly rated by the komoot community. Hikers often praise the dramatic, rugged scenery and the true sense of wilderness. The challenge of summiting Idaho's highest peaks and the beauty of the pristine alpine lakes are frequently mentioned as major highlights.

Where can I park for the Mount Borah hike?

There is a designated trailhead for the main route up the mountain. The Borah Peak Trailhead is a popular and well-regarded starting point for the climb, located off of Birch Springs Road near Mackay.

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