Trek difficulty
Moderate - Difficult
Trek duration
8 Days
Trek altitude
17,585 feet
Group size
6-12
Trek distance
62 km
Basecamp
Uttarakhand
Best Time
May-June | September-October
Pickup Point
Dehradun (Prince Chowk)
Borasu Pass is the most thrilling trek of the Indian Himalayas. However, this trek is not suited for the timid, this is a trail that tests your limits. The Borasu Pass Trek is also known as the Badasu Pass Trek. Borasu Pass stands out as a hidden Himalayan treasure, showcasing untouched wilderness and breathtaking alpine panoramas. This trek is the most adventurous trek among the other treks. Due to the challenges, the trek is less crowded because many trekkers find it difficult. So, if you are looking for an adventurous trek and have experience, Borasu Pass Trek is a must-do trek. Along with the adventurous, the trek offers many historic places and has breathtaking scenic views. Borasu Pass Trek is also a seasonal trek.
Highlights of the Borasu Pass Trek
Borasu Pass Trek is renowned for its dramatic terrain and incredible variety, making it a top choice for seasoned trekkers and thrill-seekers exploring the trans-Himalayan wilderness. This is the trek that has challenges which are worth the risk. So, let’s know about the highlights of the trek so that it makes easy to choose Borasu Pass trek.
Day 1: Drive from Dehradun to Sankri
Day 2: Trek from Sankri to Taluka to Seema
Day 3: Seema to Har Ki Dun
Day 4: Rest Day at Har Ki Dun
Day 5: Har Ki Dun to Ratta Tho
Day 6: Sauni Bhera to Upper Lamjunga
Day 7: Cross Borasu Pass to Bonga
Day 8: Bonga to Chitkul
Day 9: Drive from Chitkul to Shimla
The best time to undertake the Borasu Pass trek is during the pre-monsoon months of May to June and the post-monsoon window from September to October when the weather is generally clear and trail conditions are most stable. It’s important to know the ideal season as the Borasu pass trek is already challenging so, we do not want any other hurdles while choosing wrong season.
This is the best time for most trekkers. As the snow starts melting, the route becomes easier to cross, though you’ll still see snow at higher points. The valleys of Har Ki Dun and Ruinsara are full of blooming flowers, adding vibrant color to the landscape. The days are usually warm and comfortable, but the nights can still be chilly. You will get a clear view of the mountains with a trail covered with beautiful green grass.
September to October is also the best season to do the Borasu Pass Trek as these months provide you clear skies with fresh air. It offers you great mountain views which are great for photographs. During this season the green valleys slowly change to golden and orange. The forests and meadows look peaceful and full of autumn beauty. With fewer trekkers on the trail during this time, the route stays quiet and peaceful—perfect for those who prefer solitude and a stronger bond with nature.
Day 1: Drive from Dehradun to Sankri
It’s a drive of 8 to 10 hours to Sankri which is the starting point of Borasu Pass trek. The drive will take you through Uttarkashi district which is very beautiful place so, enjoy the view of Pine Forest and river valley.
First Day of the Trek:
You will begin your 1st day from Dehradun to Sankri, which is a 200km long distance that takes around 8 to 10 hours to cover. The altitude of today is around 2,400 m. Sankri is not only the base point for several treks but also a sizable village, home to around 250 houses. While following the route, you’ll pass through scenic places like Nainbagh, Naugaon, Purola, Jarmola, Mori, and Naitwar, each offering its own charm and natural beauty.
Day 2: Trek from Sankri to Taluka to Seema
There is a 12 km long drive from Sankri to Taluka and then a 13km long trek from Taluka to Seema.
2nd day of the Borasu pass trek:
This marks the first day of your trek. You’ll begin with a 12 km drive from Sankri to Taluka, the road ahead, and then start your trek with a 13 km walk from Taluka to Seema. The altitude of the trek is from 7053 feet to 8530 feet. You will start the trek from Taluka Village which is a small village. As this is the final village of the route stock up all the essential items from here. There will be no network further from this village so, inform your family accordingly. On 2nd day you will pass through many small bridges and streams with zig-zag trails.
Day 3: Seema to Har Ki Dun
Trek 12 km to the majestic Har Ki Dun valley, known for its breathtaking meadows and snow-capped peaks.
Trekking on 3rd day from Seema to Har Ki dun
The total distance of the 3rd day of trekking is around 13 to 14 km. Although the altitude of the day is 8530 feet to 11482 feet. Today’s trek is a steady climb, with an altitude gain of about 900 meters in 5–6 hours. Start from the Forest Rest House and take the trail to the right. Soon, you’ll reach a suspension bridge—cross it and follow the steep path uphill. This trail also leads to Osla village. As you climb, you’ll spot a big waterfall across the valley. You will also see a cemented bridge that offers a great view of the waterfall. Looking ahead, you’ll see stunning views of lush green valleys and snow-covered peaks—Kalanag on the left and Banderpoonch on the right. A few shepherd huts can also be found in this area. Just a reminder that you will have your food accordingly.
Day 4: Rest Day at Har Ki Dun
After doing so much trek you must take rest for a day. Because it can be exhausted for the body. You can explore Maninda Tal or Jaundhar Glacier.
4th day of the Borasu Pass trek is a rest day
On the 4th day of the trek, you can rest and stay at the campsite or if you want you can explore the day because the earlier day was a long day and due to that you must be not getting enough time to explore the beauty of the destination. So, enjoy the day and recollect your energy for the next day.
Day 5: Har Ki Dun to Ratta Tho
Explore the day and trek carefully the trail is surrounded by alpine landscapes.
5th day of the trek from Har Ki Dun to Ratta Tho
The distance from Har Ki Dun to Ratta Tho is around 5 to 6 km and the altitude is around 11482 feet to 13451 feet. Today’s trek is relatively easy and short, taking about 3 hours in total. You’ll leave the Har Ki Dun Valley and gradually gain altitude while moving closer to the Borasu Glacier. You can explore Maninda Tal in the trek however, this spot makes a good rest or camp point. Then you can climb to Climb to Ratta-Tho also known as Lal Pathar according to locals.
Day 6: Sauni Bhera to Upper Lamjunga
Reverse moraine fields, boulder zones, and early patches of snow
6th day of the Borasu Pass trek from Sauni Bhera to Upper Lamjunga.
The distance of the trekking day is 6-7 km which can take 5-6 hours to cover. The altitude of the day is from 13451 feet to 16,076 feet. Today’s trek is short but steep. Follow the trail through boulders, descending toward the Borasu Glacier stream. The pass and nearby peaks remain in view. Continue on the muddy path with the stream to your right, passing through grassy meadows. Keep following the trail as it gently climbs over a snowfield, then flattens out. After some time, you’ll see a tall, pyramid-shaped boulder, then some wide flat rocks. The trail climbs again—gradually at first, then steeply.
Continue through boulders and a snowy patch with some soft, wet ground. About 10 minutes later, you’ll reach a damp meadow called Saunbhera, named after the rainy season and the shepherds who camp here with their sheep in summer.
Day 7: Cross Borasu Pass to Bonga
This is the most challenging day.
On the 7th day, you will Cross the Borasu Pass to Bonga.
It’s a long day with a distance of around 10-12 km which takes 8-9 hours to cover. With altitude of Altitude: 16076 feet to 17224 feet to 14763 feet. Begin walking on a gradual snow slope toward the pass. In 5–10 minutes, you’ll pass between snowy boulders. The trail then alternates between steep climbs and flat snowfields for another 30–45 minutes. It takes about 2 to 2.5 hours to reach the steep ridge below the pass. The final climb is tricky, with loose rocks—use ropes or an ice axe if needed. After 3 hours, you’ll reach Borasu Pass, marked by two stone towers.
On the other side, you’ll see breathtaking views of snow peaks, steep slopes, and the vast Zupica Glacier. The descent starts with a steep glissade (slide) of about 125–150 ft, then eases out. Cross one final stream and snow patch to reach Bonga Campsite, a green meadow with a shepherd shelter. The Bonga Peak rises on the right.
Day 8: Bonga to Chitkul
The last village on the Indo-Tibetan Road in Kinnaur district.
8th day of the trek from Bonga to Chitkul
The distance from Bonga to Chitkul trek is 10–12 km with an altitude of around 4,000 m to 3,450 m.
It is a Moderate descent trail with a few hurdles on the way. You start from Bonga campsite, a green meadow with a stream and shepherd huts, with Bonga Peak to your right and Borasu Glacier behind. Morning views are stunning, with wildflowers and grazing animals in summer. The stretch from Bonga to Chitkul offers a scenic transition from rugged high-altitude terrain to lush Kinnauri valleys, with peaceful forest walks, the first sight of farmlands and villages after days in the wild, and a warm welcome into Chitkul—where traditional wooden temples, local cuisine, and basic amenities await near the Indo-Tibetan border.
Day 9: Drive from Chitkul to Shimla
This is the ending drive of your Borasu Pass trek.
9th last day of the Borasu Pass Trek is the drive from Chitkul to Shimla
The total distance to cover the last day is around 10–12 km which takes 4–6 hours to complete. With altitude from 4,000 m to 3,450 m.
You begin at Bonga campsite. You’ll walk through flower-filled slopes, cross glacial streams, and pass through dense pine and birch forests. Chitkul is a charming wooden village with a mobile network and many guesthouses and Dhabas. This final leg of the Borasu Pass trek leaves you with a deep sense of achievement and a heart full of Himalayan memories.
🚐 Transport Pickup Time: 7:30 AM, Prince Chowk, near Dehradun Railway Station.
From the scheduled pick-up point to the base camp, we arrange transportation in vehicles like Bolero, Innova, Dzire, or Tempo Traveller (12-seater). This is shared by trekkers at a pre-decided cost. All vehicles are non-AC for mountain travel safety.
🏡 Accommodation Base Camp Stay: 1-night accommodation in a local homestay or guesthouse, offering a glimpse of authentic Himalayan lifestyle. (Single-sharing available at INR 5,000 extra per person for the entire trek)
On-Trek Stay: Twin-sharing tents (Vango Halo Pro / A-Shape) built to handle extreme weather while keeping you comfortable after a long day’s trek.
⛺ Camping Equipment High-quality sleeping bags rated for sub-zero temperatures.
Foam mattresses for added comfort.
Safety gear including microspikes, gaiters, helmets, and ice axe (where required).
💊 Medical Support Our team carries an extensive medical kit and is trained in high-altitude first aid.
Oxygen cylinders (checked before every trek) are available at campsites and with the team at all times.
🌿 Permissions & FeesAll forest entry permits and camping fees for Indian nationals are included. (Additional charges apply for foreign nationals)
🍽 Meals Nutritious veg meals (with eggs) — Breakfast, packed lunch (on trek days), evening snacks, and dinner.
Jain and vegan meals available on prior request.
Dedicated kitchen tent and dining tent with tables and seating.
👨👩👧👦 Our Team Certified Trek Leader (AMC/BMC/NIM-trained) for safety and smooth execution.
Local Guides with deep knowledge of the trail, culture, and biodiversity.
Support Crew including cook, helpers, porters, and mules for common equipment.
🎒 Cloakroom Facility You can leave extra luggage safely at our base camp free of charge.
During The Trek Exclusion
❌ Personal expenses like tips, medicines, and phone calls.
❌ Travel from your hometown to the pick-up point.
❌ Personal trekking gear (jackets, shoes, backpacks, cutlery) — available for rent at affordable rates on prior request.
❌ Backpack offloading (optional) – INR 400 per bag/day (up to 12 kg).
❌ Trek insurance (mandatory) — to be arranged separately.
❌ Buffer day cost (if used) — to be paid directly to the trek leader.
❌ Any items not mentioned in the inclusions list.
It’s a difficult trek, suitable for experienced trekkers. You need to be comfortable walking long distances over several days, crossing snow, boulders, and high-altitude terrain above 5,000 meters.
Mobile signal is available in Sankri and may be patchy in Taluka. After that, there is no network coverage, so inform your contacts beforehand.
Yes. You’ll cross glacial sections and streams, especially beyond Ruinsara and near the pass. Proper footwear and guidance are essential.
Yes, you’ll need a permit from Govind Pashu Vihar National Park, usually arranged by your trek operator.
Typically, 9 to 10 days, including travel to and from base points.
Testimonials
Radandi Shashank
“You are not just a mountain trek guides, but a true guardian of the journey. Your unwavering loyalty to our team, the mountains, and safety itself is extraordinary. Every step felt secure because of your dedication, integrity. And stayed committed to every trekker, through every challenge, with patience, care, and honesty. Huge respect to Subodh Jii n Aditi Mam!! Thank youu @thinairexpedition It was wonderful experience!!❤️❤️
67D3_KALYAN
Completing the Kedarkantha trek at an altitude of around 12,500 feet was not just a trek for us, it was a life-long memory, and a major reason for this unforgettable experience is our guide Shubhod Sir. From the very first day till the summit, Shubhod Sir guided us with immense patience, discipline, and genuine care. At every difficult patch, when our legs were tired and breathing became hard, his calm words, constant motivation, and confident leadership gave us the strength to keep moving forward. He never rushed anyone and always made sure that every member of the group was safe, comfortable, and mentally strong. Shubhod Sir’s knowledge of the mountains, weather, and high-altitude conditions was truly impressive. More than a guide, he felt like a protector and mentor who treated everyone like family. His positive attitude and humble nature created a sense of trust and confidence among all of us. We are also thankful to Atidhi Madam for her support and cooperation during the trek, which added to the smooth experience. Because of Shubhod Sir’s guidance and dedication, we successfully reached the summit with confidence and joy. We will always remember this trek with gratitude and respect. Truly blessed to have a guide like him. 🙏⛰️
Arvind Sahu
Wonderful experience totally worth it. At those price they provided services that no one could provides really enjoyed ❤️🎉
Kolanu Anirudh
This is my first trek in Uttarakhand(Kedharkanta) and Thin Air Expedition made it a memorable one Thanks for everything subodh bro you made it so special.
kanica kandpal
Completed the Gaumukh–Tapovan trek with Thin Air Expedition, and it was an exceptional experience from beginning to end. Instead of opting for a fixed-departure model, we chose a personally curated itinerary, as this was our first trek—and it turned out to be the perfect decision. The team was extremely thoughtful in planning each day’s distance, ensuring we were comfortably challenged without ever feeling overtired or exhausted upon reaching the campsites. Every campsite was carefully selected, offering not just safety and comfort but also breathtaking views that made each halt truly memorable. What stood out most was the level of personalization. The itinerary was clearly tailored to our pace and comfort, and the trek leader constantly shared insightful facts about the region, its geography, and cultural significance, adding depth and meaning to the journey. Overall, Thin Air Expedition delivers a highly personalized, well-paced, and enriching trekking experience. I would highly recommend them, especially for first-time trekkers looking for a safe, informative, and thoughtfully curated adventure.Sen
Raj Bahadur
I booked my trek with Thin Air Expedition on a friend’s recommendation, and it turned out to be a great decision. They managed travel and accommodation very smoothly, and everything was well organized throughout the journey. The team stayed in regular coordination, ensuring that stays and drivers were properly arranged each day. The entire trip was timely, hassle-free, and also pocket-friendly. I would definitely recommend Thin Air Expedition—you can trust them completely with your travel and trekking plans.
sachin aulakh
I recently completed the Kedarkantha Trek with ThinAirExpedition, and the entire experience was outstanding. The coordination, communication, and arrangements were excellent. The trek leaders were experienced and friendly, the support staff was humble, the stay was comfortable, and the food quality in such high altitude conditions was truly impressive. Their focus on safety and responsible trekking made the journey even better. I would definitely choose them again for my next Himalayan adventure! 🏔️✨
Aman rai
I recently completed a trek with the help of ThinAirExpedition, and the entire experience was very comfortable. From stay arrangements to travel from Rishikesh to Rishikesh, everything was well managed. The driver was extremely polite, supportive, and made the journey smooth and stress-free. Overall, a great experience and I would definitely recommend them.
Nitya Jaiswal
Kedarkantha was not just a trek, it was an experience that helped me reconnect with myself. Thanks to Thin air expeditions , I felt safe, cared for and encouraged at every step. The sunrise at the summit, the laughter around the campfire and the kindness of the guides will stay with me forever. If you're looking for a company that treats you like family on the mountains, this is the one.
Biswajit Sahoo
Subodh Sir making the trek so much of fun and intresting .. Awesome Experience with Subodh Sir
Anmol Verma
Overall trekking and accommodation was a very smooth experience. Our trek leader Mr. Ramesh was amazing and very helpful. He managed to make the trek look easy. Overall experience was 10/10. Would highly recommend.
Rishabh Singh Rana
Trek Guide Mr. Ramesh Ji is a very cool & good person. Trek journey became beautiful with the group and overall it became my one of the best experience.
aditi vaidya
I recently went on a trek with Thin Air Expeditions, and I can't get over the experience I had! I did the Phulara Ridge trek with Subodh sir, and it was an incredible experience. What made it even more special was that Subodh sir made sure I could bring my dog, Flake, a toy pom. His team and him took such great care of us, and it was clear that they truly care about their guests, human or canine! The group was amazing too. I met some wonderful people along the way, and we formed lifelong bonds. The whole experience was beautiful – from the breathtaking views to the friendly, supportive environment. I’ll cherish these memories forever! If you're looking for a SAFE, well-organized, fun, and caring trekking company, Thin Air Expeditions and Subodh sir are the ones to go with!
Anuja Vaidya
It was a wonderful experience with TAE on Phulara ridge trek, everything was on point the gears, food, trek guides and Subodh sir himself was an amazing leader who is the founder of TAE, he made sure the experience was amazing even for the first timers keeping safety the first priority. Also I took my Dog, Flake along with me for the trek and it was a great experience for her as well and her food and safety was well taken care of . 🐾 Would love to go back again with Thin air expedition. Thank you so much 🤗
Simran Samal
Phulara Ridge Trek – A Memorable Experience for me !!! Someone once told me, “Trips aren’t just about travel — they become a part of you.” I never really believed it, but this time, Phulara Ridge became exactly that for me. Our first campsite — the forest trail, the tents, the whole setting — gave me the first taste of what was to come. Everything was so thoughtfully arranged, it felt like nature itself had prepared that space for us. All thanks to our trek leader, Subodh bhai 🙌🏻. The next stop was magical in its own way. The campsite was picture-perfect, and we even ended up learning a bit of the local Uttarakhandi dance from Dev bhaiya (well… I tried to! 😄). In the evenings, we played games and spent such a good time that we forgot the weight of city life for a while. And finally, the Ridge: Honestly, we thought the weather would block the views, but Subodh bhai timed it so perfectly that the skies cleared for us. Walking on the ridge — one valley on the right, another on the left, clouds passing beneath us — felt surreal. We sat there for hours, just soaking it all in. It was pure peace. And yes, we even made tea there!!! 🫶🏻 (Of course, we made no mess, cleaned it all up, and left the space exactly the way it should be 😌). For me personally, trekking has always been like meditation — a way to quiet the noise and reconnect with myself. This trek with Subodh bhai and the team gave me exactly that: peace, perspective, memories for a lifetime, and inspiration. #SoGrateful 🙏🏻 Thank you, Subodh bhai and team, for making this such a soulful and unforgettable journey! Lastly Just one note for all: “In the end, we don’t conquer mountains; they help us discover who we truly are.” To anyone even considering it: please go with #ThinAir Expeditions to experience the rawness of trekking, the beauty of nature, and the joy of escaping city life for a while. You’ll come back not just with pictures, but with stories, stillness, and a piece of the mountains in your heart. All the best !!! ✌🏻
Netra Sharma
It was a wonderful experience with ThinAir Expedition. I went on my first trek to Phulara Ridge, and it was truly amazing. Our guide, Subodh ji, managed everything so well and remained patient throughout the trek. I enjoyed every moment and every spot. The place, the cook, and the helpers were all wonderful. The food and camps were awesome. I highly recommend joining ThinAir Expedition to experience the best of “pahadi” life!
Vaibhav Srivastava
Thin Air Expedition gave us the best experience while trekking. Everything was finely arranged and properly taken care of whether it was travel, food. Staff availablity. But the best part was free hand while trekking. Subodh led us beautifully taking in note that everyone reaches the base camp and everyone is doing well. Consulting our next phase keeping in mind the safety and gears. It was collectively very amazing. He gave us full free hand additionally it is our responsibility as well to take care of each other. We did so many activities had games and fun and he even taught us how to camp. How to set up it was fun. If it would've given me option I'll rate it 10. Thanks subodh and team and thin air expedition for such a memorable trip.
Somya Chaturvedi
I recently did the Phulara Ridge Trek with Thin Air Expedition, and it was my first trek ever truly an unforgettable experience! Everything was so well managed from safety arrangements and equipment to food and stay, I never had to worry about a thing. Our trek leader, Subodh, was extremely supportive, patient, and motivating, which made a huge difference for a first-timer like me. The food was simple, homely, and very satisfying after long trekking hours. Most importantly, safety was always the top priority. For anyone planning their first or next trek, I’d highly recommend Thin Air Expedition. Professional, caring, and passionate about making the experience memorable!
We're always ready for adventure
Trekking comes with uncertainty. Weather, terrain, and setbacks are part of the journey. We embrace them with resilience and openness—each challenge makes us stronger and more appreciative of nature's beauty.
We embrace low-noise trekking
We blend into nature, not the other way around. We avoid shouting, loud music, and noisy games. In silence, we hear birdsong, streams, and the wind—inviting peace, reflection, and a deeper connection with nature.
We protect the environment
We protect the environment by minimising waste, reusing resources, and picking up litter. We carry eco-bags, segregate waste, and inspire others to preserve trails. Sustainable trekking ensures these mountains remain beautiful for future generations.
We are self-sufficient
We carry our load as much as possible, manage our gear, and stay prepared for all situations. Self-sufficiency builds confidence, independence, and respect for fellow trekkers, support staff, and the trail itself.
We support each other
Trekking is not a solo act. We wait for each other, share burdens, and uplift teammates. By putting the group first, we build strong bonds and help everyone complete the trek joyfully.
We are fit and prepared
We train well before our treks. This helps us walk longer, handle emergencies, and contribute to the team. Fitness ensures we are never a burden and always ready to help when needed.
