Region :- Uttarakhand
Duration :- 7 Days
Grade :- Easy To Moderate
Max Altitude :- 17,866 Ft.
Approx Trekking Km :- 56 Kms.


Every year lots of trekkers from around the world come for Har Ki Dun trek. It is one of the most beautiful all season treks. However, very few know that if you continue on the same trail further, you can cross into Himachal. The pass which you will be using to do so is known as “Borasu Pass“. It connects Tons Valley in Uttarakhand with Baspa Valley in Himachal. Trek to Barasu Pass offers the true promise of adventure. It is considered a strenuous trek, with pass located at a high altitude of 5360 M. The trek starts from Lovely “Taluka” Village and goes via villages of Gangaad, Dhatmir, Seema and Osla until Har Ki Dun. The trek passes through dense forests consisting of chestnut, walnut, willow and chinar trees. The trek from Osla to Har-ki-doon is through terraced mountain fields, lush green grassy patches, and thick coniferous forests The trail from Har ki Dun to Chitkul (In Himachal) covers all kinds of landscapes that may require the use of some technical equipment too. Being on the border of Indian Himalayas the pass is very close to Tibet. The Borasu Pass trek is meant for experienced trekkers only due to its taxing trail, boulder sections, multiple glacier crossings infested with crevasses, steep ascents and descents. The best months for the Borasu Pass Trek is May, June, Late-September and October. Stay on this page for more information on the Borasu Pass Trek.


Day1: Dehradun to Mothad Kotgaon (Sankari) Drive 7/8 hr drive 190 km.

We start early from Dehradun and reach Mothad Kotgaon (Sankari) village by evening. Govind is the final stretch through Pashu National Park after crossing a check post at Netwar. We spend the night relaxing in a guest house or camps.

Day 2: Mothad Kotgaon (Sankari) (1,920 m) to Border (2,560 m) via taluka (1,820 m) 1 hour drive 5-6 hours hike: 14 km.

After breakfast we are taken from Mothad Kotgaon (Sankari) to Taluka. The drive is a bit bumpy. The trek starts from the taluka on the path. It is quite pleasant to walk along the Supin River, walking through rapids with us, under the shade of walnuts, cedars and other trees. Often the passing villagers greet us on the way.

The path crosses over some streams which merge with Supine. After a few hours’ walk, Gangad village can be seen across the river to the left. We continue our hike and after about an hour’s walk, the quaint village of Osla reveals itself. The border opposite Osla to the river is a small settlement. We camp here or live in a hut with a local family in the village.

Day 3: Har ki Doon peak taken from Kalakatidhar Har ki Dun Peak – May; PC: Arnab Seema / Osla to Har ki Dun (3,510 m) 4-5 hours hike: 10 km

From Osla the trail gradually rises and passes through flowering bushes such as orchids, wool flowers and sunflowers. The ascending path rises above the confluence of the river from the Supin River and the Ruinsara Valley.

After going upstream to the left of the river, we camp at a very picturesque location at Har Ki Doon, at the junction of two valleys – one originating from Jaunsar glacier and the other beyond Hisar glacier.

Day 4: Har ki dun to Ratha tho (4,200 m) 4-5 hours hike: 5 km

Today we trek at a moderate speed to reach Ratha Tho. On Vasi, we pass through Morinda Tal, which is a small lake. A portion of the trek is little more than a boulder, but with a view of snow-capped peaks and wide valleys, it is a scenic walk.

Day 5: Rath Tho Borsu Pass Base Camp (Upper Lamjung) (4,900 m) 3-4 hours hike: 4 km

On this day, we move to a higher level. There are boulders on the path and often covered with snow. The campsite in Upper Lamjang is also mostly on ice. From here one gets a beautiful view of the valley behind.

Day 6: Bonga (4,000 meters) from Borsu Pass Base Camp (Upper Lamjung) to Bonsu Pass (5,360 m) 7-8 hours hike: 8 km

We start before sunrise for this day’s trek. As we keep going up, so do the thoughts behind us. After crossing two glaciers and one final climb on the boulder, the Borasu-shaped cradle is in front of us. We descend towards the Himachal of the pass in a large glacier which usually appears on the initial slope. The trek ahead is along the tributary of the BSP River. We can find shepherds near the campsite.

Day 7: Bong to Chitkul (3,430 m) 8 hrs. hike: 15 km

Today’s trek takes about 8 hours. It is an easy walk through flowering fields and forests. Overnight in Chitkul village. The trek ends here. One can get public or private transport to Shimla from Chitkul or Sangla.

How To Reach?

By Air:-
Jolly Grant Airport, Dehradun is the nearest airport from Sankri but it is about 200 kms far from base camp. After your landing at Dehradun, you can travel the further journey with your trekking company by road.

By Train:-
Like the airport, Dehradun  is also the closest metal road to this trek. Further distance will have to be covered by the road to reach Bhradsar lake.

By Bus:-
After reaching Dehradun, you can catch a direct bus to Sankri from Massoorie bus stand which is just adjacent to the Dehradun railway station but before 8 am. However, you can also book the taxi to Mothad Kotgaon (Sankari) village or you can contact your trekking company to assist you.

Things to carry

Basics Gears

• Backpack & Rain Cover (40-60 Litres)
• Trekking Shoes
• Trekking Pole
• LED Torch
• One Water Bottle (one litre)
• Basic Medications (or prescribed if any)

• Trekking Jacket
• Three (Five in winter) Warm Layers
• Two trek pants (one Wear and one carry)
• Two collared t-shirts
• Thermals

• Sunglasses
• Sunscreeen Lotion (SPF 50/70)
• Lip Balm (SPF 30)
• Sun cap
• Synthetic hand gloves
• Two pair of Socks
• Raincoat/Ponchos

• Daypack (20 litres), if you opt to offload your backpack
• Toiletries
• Cutlery
• Plastic cover (for wet clothes)

Mandatory Documents
Original and photocopy of government photo identity card- (Passport, Aadhaar Card, Driving license or voters ID)