Bali Pass

Bali Pass — From the Tons Valley Across to Yamunotri

Bali Pass is one of the toughest crossover treks in Uttarakhand and the only standard route that connects the Tons valley to the Yamunotri shrine across the western Garhwal divide. Eight days, roughly 50 kilometres on foot, and a glaciated pass at 16,240 ft (4,950 m) are the bones of the trek. The route walks you past the 3,000-year-old Duryodhana temple at Osla, into the rarely-visited Ruinsara valley with Black Peak overhead, up to a remote rock-cave shelter at Odari, across a snow pass, and down to one of the four sacred Char Dham pilgrimage sites of Hindu India.

Why this trek is unique

Bali Pass is one of the very few "true crossover" treks in Garhwal — most Uttarakhand routes are out-and-back to a lake, peak, or meadow, but Bali physically transports you between two valleys (Tons and Yamuna) that are otherwise connected only by a 12-hour road journey. The Yamunotri descent ends at the source of the Yamuna river and within walking distance of the Char Dham pilgrim circuit. The Ruinsara side is also unusual — a small, less-trodden glacial valley that sees a fraction of the foot traffic of neighbouring Har Ki Dun.

The Tons valley approach

The trek begins at Sankri (6,400 ft) inside Govind Pashu Vihar Wildlife Sanctuary. Day 2 drives to Taluka and walks 12 km up the Supin river to the Seema-Osla cluster (8,500 ft), passing the famous Duryodhana temple — a 3,000-year-old wooden structure where the antagonist of the Mahabharata is worshipped as a benevolent local deity. Day 3 climbs east up the Ruinsara valley through Debshu Bugyal to Ruinsara Tal (11,800 ft), a glacial lake under the south face of Black Peak (Kalanag, 20,955 ft). Day 4 is a critical acclimatization day with a walk-high-sleep-low protocol and rope-work drills.

The high-altitude push and pass crossing

Day 5 climbs steep moraine to Odari (13,800 ft) — a natural rock-cave overhang under a granite cliff that has served as Gaddi shepherd shelter for generations. Day 6 is the hardest non-pass day: a 1,800 ft gain over loose moraine and patchy snow to Bali Col high camp at 15,600 ft, a windswept moraine pocket. Day 7 is summit day — a 1:30 AM wake-up, headlamp climb under starlight, fixed-rope ascent up a 60° snow slope to the pass at 16,240 ft, and a long technical descent on the Yamunotri side that involves rappels, glissades, and a 5,440 ft drop to the Yamuna headwaters. This is a 14-15 hour day and the longest single push in any of our Uttarakhand treks.

What you'll see at the pass

The Bali Pass panorama is among the finest in the western Garhwal. Swargarohini I-IV (the Mahabharata's "stairway to heaven", 20,000-21,000 ft) form a single granite wall directly to the north. Black Peak sits behind you to the southeast. The Yamuna gorge plunges 5,000 ft below to the west, with the Banderpoonch massif on the far side. The pass itself is a narrow snow saddle marked by Hindu pilgrim cairns and Tibetan-style prayer flags. Wind speeds are typically 40-60 km/h with temperatures of -10°C to -15°C; we do not linger more than 30 minutes.

Difficulty and prerequisites

Bali Pass is a graded difficult trek — we only enrol trekkers who have completed at least one trek above 15,000 ft (Hampta Pass, Roopkund, Stok Kangri, Goecha La, etc.) and can demonstrate cardiovascular fitness equivalent to running 5 km in 30 minutes. The trek requires basic mountaineering skills (rope work, ice axe arrest, crampon/microspike use, jumar ascent on fixed rope), all of which we cover in a Day-4 briefing and drill. Anyone with a history of pulmonary issues, untreated hypertension, knee instability, or vertigo on snow should not attempt this trek.

Best season and weather

The pass is reliably open in mid-May to mid-June and again in mid-September to mid-October. June-July are also doable but bring monsoon weather. The pass is closed by snow from late October through late April. The single best month is late September.

Camping, gear, and porter logistics

HeyHikers provides four-season tents, sleeping bags rated to -15°C, kitchen tent, fixed ropes and harnesses for the pass, helmets, microspikes, ice axes, and high-altitude porters who carry the group gear. You carry your daypack with personal items — typically 6-8 kg. Personal trekking poles and gaiters are mandatory.

Cultural and historical context

The Tons valley villages — Sankri, Taluka, Datmir, Osla, Gangad — are among the oldest continuously inhabited Garhwali settlements. Osla's Duryodhana temple is one of only a handful in India where Duryodhana is the principal deity. Yamunotri at the trek's terminus is a Char Dham (four-abode) pilgrimage site sacred to the goddess Yamuna — pilgrims have walked this route since at least the 8th century, when Adi Shankaracharya is said to have established the original temple.

Reach Dehradun and join our shared transport from Prince Chowk at 6:30 AM on Day 1. Drive 9-10 hours to Sankri via Mussoorie, Purola, and Mori. The trek finishes at Yamunotri; we drive you back to Dehradun on Day 8.

Cancellations must be requested in writing.

- More than 30 days before the trek start date: 90% refund. - 21–30 days before: 50% refund. - 11–20 days before: 25% refund. - 10 days or fewer: no refund, but you may transfer your slot to another trekker or to any future batch within 12 months at no extra charge.

Refunds are processed to the original payment method within 7-10 working days. Trip cancellations triggered by us (weather, force majeure, government restrictions) are refunded in full or moved to an alternate batch at your option.