Thorong La (5,416 m) is the high point – literally and emotionally – of the Annapurna Circuit Trek. Standing among the prayer flags on one of the world’s highest trekking passes is unforgettable, but the crossing demands respect. This guide covers everything you need to know to cross Thorong La safely and enjoy it.

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Where Is Thorong La?

Thorong La connects the Manang valley in the east with the Mustang district and Kali Gandaki valley in the west. On the Annapurna Circuit it is reached after about a week of trekking, which is why the circuit is traditionally walked anti-clockwise: the gradual climb through Manang gives your body time to adapt before the pass.

Thorong Phedi or High Camp?

Your guide will choose based on how the group is acclimatising. The steep 1-hour climb from Phedi to High Camp is a good test the afternoon before.

The Crossing, Step by Step

1. 3:30–4:00 am: wake-up, hot drink and a light breakfast.
2. 4:00–5:00 am: set off by head torch. The trail zig-zags up rocky moraine; it is very cold until the sun rises.
3. Sunrise: first light on the Annapurna and Chulu peaks behind you.
4. 8:00–10:00 am: reach the pass, marked by a sign, prayer flags and a small teahouse. Take photos, then start down within 15–20 minutes.
5. Descent: a long, steep 1,600 m drop on loose ground to Charabu and Muktinath, with views of Dhaulagiri.

Why start so early? Strong winds usually pick up on the pass from late morning, making the afternoon crossing cold and dangerous.

Altitude Sickness on Thorong La

Thorong La is higher than Everest Base Camp. Watch for headache, nausea, dizziness, breathlessness at rest or confusion. If a trekker shows serious symptoms at Phedi or High Camp, the only safe option is to descend to Ledar or Manang – never push on over the pass while unwell. Our guides check oxygen saturation every morning and evening in the upper valley. Horses can be hired at Phedi for tired trekkers in season.

What to Wear and Carry on Pass Day

• Thermal base layers, fleece and a warm down jacket.
• Windproof and waterproof shell jacket and trousers.
• Warm hat, buff, insulated gloves plus liner gloves.
• Sunglasses (category 3–4) and high-SPF sunscreen.
• Head torch with spare batteries.
• 1.5–2 litres of water in an insulated bottle (to stop freezing) and snacks.
• Microspikes in shoulder seasons or after snowfall, and trekking poles for the descent.

Our high-altitude packing list applies equally to the Annapurna Circuit.

When Is Thorong La Closed?

From December to February heavy snow can close the pass for days at a time, and storms can occur in any season. In October 2014 a sudden blizzard caused a major disaster on the pass, which led to better weather warnings and trail markings. Today, trekking with a licensed guide, checking forecasts and turning back when conditions are poor keeps the crossing safe.

Tilicho Lake as Preparation

The Annapurna Circuit with Tilicho Lake takes you to about 4,919 m three days before the pass, which is excellent preparation for Thorong La. See the full day-by-day plan in our Annapurna Circuit itinerary guide.

Frequently Asked Questions

How high is Thorong La pass?

Thorong La is 5,416 m (17,769 ft) above sea level, making it one of the highest trekking passes in the world.

How long does it take to cross Thorong La?

Most trekkers take 8–10 hours from Thorong Phedi or High Camp to Muktinath: 3–6 hours up to the pass and 3–4 hours down.

Is Thorong La dangerous?

It is non-technical, but altitude, cold and sudden weather can make it dangerous. Crossing with a licensed guide, starting early and turning back in bad weather makes it safe for well-acclimatised trekkers.

Can beginners cross Thorong La?

Yes, fit beginners cross it every season, provided they follow a good acclimatisation schedule and prepare with training before the trek.

Which is higher, Thorong La or Everest Base Camp?

Thorong La (5,416 m) is slightly higher than Everest Base Camp (5,364 m), but lower than Kala Patthar (5,545 m).