Detailed Route
Borasu Pass Expedition Itinerary — Day by Day Route & Camps
An 8-day savage traverse from the ancient wooden temples of Sankri (Uttarakhand) to the Indo-Tibet border terminal of Chitkul (Himachal Pradesh).
Standard RouteThis is the standard mountain pacing for this trek. Specific operators may add an acclimatization day or alter the starting point. Check individual operator schedules for their exact logistics.
Duration
8 Days
Total Distance
66 KM
Max Altitude
17,750 FT
Trek Type
linear
Altitude Profile
👆 Interactive Route: Tap map to explore segment insights
Points show end-of-day camp altitude. Summit days show peak altitude reached.
Day by Day Breakdown
Drive: Dehradun to Sankri
Homestay/Lodge stay. Expedition briefing at 6 PM. Technical: A winding mountain drive. Road quality is generally good until Purola. The last 20km stretch to Sankri is narrow. Hydrate to offset travel fatigue. Safety: Final reliable electricity and network. Charge all devices. Check your high-altitude gear (gaiters/microspikes) tonight.
Key Landmarks
Drive to Taluka & Trek to Osla
Homestay at Osla. Experience the local culture and wooden temple architecture. The drive to Taluka is on a rough mountain road. The trek follows the Supin river through forests and small settlements before reaching Osla village.
Key Landmarks
Staying At
Trek: Osla to Har Ki Dun Valley
Night stay in tents. The first view of Swargarohini is a major milestone. Technical: Steep climb to Kalkattiyadhar followed by a scenic walk into the valley. Gain is significant today. Safety: Oximeter check mandatory. Har Ki Dun is a high-wind valley. Layer up before sunset.
Key Landmarks
Staying At
Transition: Har Ki Dun to Ratia Thatch
Night stay in tents. High-altitude survival mode begins. Technical: The trail turns wild beyond the lake. Crossing boulder fields and lateral moraine. No marked path. Use Cairns. Safety: Extreme Cold. Night temps can drop to -12C. Carry warm water. Monitor for HAPE symptoms.
Key Landmarks
Staying At
The Pass Base: Ratia Thatch to Borasu Base Camp
Summit briefing. Early sleep (7 PM). Technical: Short distance but high-effort walk on talus and scree. High risk of sliding. Safety: Oximeter check morning and evening. Wind speeds can hit 40kmph.
Key Landmarks
Staying At
Pass Day: BC to Borasu Pass (17,750ft) & Descent to Bonga (HP)
Exhausted night at Bonga. Celebration into Himachal Pradesh. Technical: The ultimate test. A steep climb on snow and ice leads to the pass. Descent into Himachal is steep and rocky. Safety: Turnback Time: 10:00 AM. Snow on the HP side becomes unstable (crevasse risk).
Key Landmarks
Staying At
The Final Walk: Bonga to Chitkul
Hotel stay in Chitkul. Celebratory dinner. Technical: Long walk through the Baspa valley. Chitkul is the last Indian village on this border. Safety: Register your exit with the ITBP Chitkul post immediately. Hydrate well.
Key Landmarks
Drive: Chitkul to Shimla / Chandigarh
Long return drive. End of expedition.
Trek Extensions & Add-ons
Har Ki Dun Valley stay
+1 DayExtended camp at the source of the Supin river before pushing for the Borasu glacier crest.
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This encyclopedia entry for Borasu Pass Expedition is curated from a mix of public survey records, first-hand climber accounts, and official permit logs. However, mountains are dynamic. If you have been on this route recently and noticed a change in terrain, water availability, or local regulations, we want to hear from you.
Community Vetted
Last Verified: May 2026
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