If there is one moment on the Annapurna Circuit that every trekker remembers for the rest of their life, it is the moment they step onto the summit of Thorong La Pass. Standing at 5,416 metres above sea level, with the wind howling across a landscape of ice, rock, and prayer flags, you realise you are standing at one of the highest trekking passes on Earth. Behind you, the Annapurna massif dominates the horizon. Ahead, the sacred valley of Muktinath stretches into the distance.
This is Thorong La Pass, the crown jewel of the Annapurna Circuit and one of Nepal’s most iconic high-altitude crossings.
But Thorong La is not just a viewpoint. It is a serious mountain crossing at extreme altitude that demands proper preparation, smart acclimatisation, and genuine respect for the Himalayas. Every year, thousands of trekkers cross it successfully. Every year, some do not make it back by altitude sickness, bad weather, or poor planning.
This guide gives you everything you need to know: the altitude, the real difficulty, a day-by-day itinerary, a safety guide built from years of experience, and expert tips that only local guides know.
Thorong La Pass.
Thorong La Pass (also spelled Thorung La) is a high mountain pass located in the Mustang District of Gandaki Province, Nepal. It sits at the top of the Annapurna Circuit Trek, connecting the Manang Valley on the east side to the Mustang Valley and Muktinath on the west.
The name “Thorong La” comes from Tibetan “La” simply means “pass.” It has been used as a trading and pilgrimage route for centuries by local Gurung, Manangi, and Tibetan communities long before Western trekkers ever set foot on it.
Today it is the defining challenge of the Annapurna Circuit and one of the most rewarding single-day experiences in all of Himalayan trekking.
Quick Facts:
| Detail | Information |
| Altitude | 5,416 metres (17,769 feet) above sea level |
| Cost | $800-$1200 USD |
| Best Season to Cross | October to November and March to May |
| Starting Point for Summit Day | Thorong High Camp (4,925m) |
| Difficulty Level | Challenging but achievable with good preparation |
| Permit Required | ACAP Permit and TIMS Card |
| Guide Recommended | Yes, strongly recommended |
Thorong La Pass Altitude
5,416 metres is extraordinarily high. To put it in perspective, it is higher than Everest Base Camp (5,364m), higher than Mont Blanc in the Alps (4,808m), and higher than any peak in North America, Europe, or Antarctica.
At this altitude, the air contains roughly 50% of the oxygen available at sea level. Your body has to work significantly harder to perform the same tasks. Walking slowly feels like sprinting. Simple decisions take more mental effort. Headaches, nausea, and fatigue are common even in healthy, fit individuals.
This is not said to frighten you. Thousands of trekkers cross Thorong La every year without incident. But understanding what the altitude actually means for your body is the first step to crossing safely.
Altitude Zones You Will Pass Through:
- Besisahar: 760m, starting point, no altitude concerns
- Manang: 3,519m, first serious acclimatisation point
- Yak Kharka: 4,018m, above the “danger zone” threshold
- Thorong Phedi: 4,450m, base before the summit push
- High Camp: 4,850m, where most trekkers spend the night before crossing
- Thorong La Summit: 5,416m, the top
- Muktinath: 3,760m, destination after descent
The ascent from High Camp to the summit is a gain of approximately 566 metres. The descent from the summit to Muktinath is a dramatic drop of over 1,600 metres steep, knee-punishing, and stunning in equal measure.
How Difficult Is Thorong La Pass?
This is the question every trekker asks, and it deserves an honest answer rather than either false reassurance or unnecessary intimidation.
The physical difficulty is moderate to challenging. The crossing itself is a long, difficult day typically 7 to 9 hours of continuous walking at high altitude. The ascent from High Camp is steep in places, the trail is rocky and uneven, and the final push to the summit will test your lungs and legs even if you are fit. The descent to Muktinath is long and hard on the knees.
The altitude difficulty is serious. This is where Thorong La separates itself from most other treks. Acute Mountain Sickness (AMS) is a real risk above 3,000 metres, and crossing at 5,416m means you are well into territory where HACE (High Altitude Cerebral Edema) and HAPE (High Altitude Pulmonary Edema) both life-threatening conditions can develop rapidly in susceptible individuals.
Is it suitable for beginners? Yes, absolutely, with the right preparation and the right team beside you. You do not need climbing skills, special equipment, or any prior experience at high altitude. What you do need is a well paced schedule to let your body get used to the altitude, a basic level of fitness, and the good sense to stop and turn back if your body tells you to.
Most importantly, having an experienced local guide makes all the difference. The guides at Nepal Mountain Adventure know Thorong La Pass the way most people know their own street. They will pace you correctly from day one, watch you closely for any early signs of altitude sickness, advise you on when to rest and when to push, and make sure you are safe at every step of the crossing. Many first time trekkers who were nervous about attempting the pass have crossed it comfortably and confidently because they had the right guide beside them. With Nepal Mountain Adventure, you are never alone on this mountain.
Check how difficult the Annapurna Circuit Trek is here.
Thorong La Pass Weather Monthly Guide
Weather is one of the most important factors in whether your crossing is a life-affirming adventure or a dangerous ordeal. Here is a month-by-month breakdown based on best time to trek Annapurna Circuit.
October : Best Month Clear skies, excellent visibility, temperatures at the summit ranging from -5°C to -15°C. This is peak season for good reason. Crowds are higher but conditions are optimal.
November : Excellent Still outstanding conditions, slightly colder. Summit temperatures can drop to -20°C. Fewer crowds than October. One of the best months to cross.
March : Very Good Spring begins. Rhododendrons bloom on lower sections of the trail. The pass becomes reliably crossable again after winter. Some snow on the upper sections but generally manageable.
April : Excellent Arguably the most beautiful month, clear skies, wildflowers, moderate temperatures. One of the top two months to trek the entire circuit.
May : Good Pre-monsoon clouds begin building in the afternoons. Still crossable but start early to beat cloud cover. The temperature is warmer, making it more comfortable.
December & January : Challenging Heavy snowfall can close the pass entirely. Temperatures at the summit can reach -30°C. Possible for experienced winter trekkers but not recommended for first-timers.
February : Challenging Conditions begin improving late February but still cold and potentially icy. Requires caution.
June, July, August (Monsoon) : Not Recommended Rain-shadow areas like Manang and Mustang receive less monsoon rain than other parts of Nepal, making this theoretically possible. However, lower sections of the trail can be severely affected. Not recommended for the pass crossing.
September : Fair Post-monsoon season begins. Trails are lush but can still be wet early in the month. Conditions improve significantly by late September.
Day-by-Day Itinerary to Annapurna Circuit Trek with Thorong La Pass
This is the exact itinerary followed by Nepal Mountain Adventure for the Annapurna Circuit Trek. Every day is carefully planned to give your body enough time to adjust to the altitude, enjoy the trail, and cross Thorong La Pass safely and confidently. This itinerary can also be customized to match your interests, for example by adding the stunning Annapurna Circuit with Tilicho Lake, starting from $990 . Just get in touch with our team and we will plan it for you.
- Day 01: Drive from Kathmandu to Besisahar by local bus (760m/2493 ft) 7 Hrs Drive
- Day 02: Drive from Besisahar to Chame by local sharing jeep (2670 m/8759 ft) 6 Hrs Drive
- Day 03: Trek from Chame to Upper Pisang (3330 m/10925 ft) 5-6 Hrs Trek
- Day 04: Trek from Upper Pisang to Manang via Nawal (3540 m/ 11614 ft) 5-6 Hrs Trek
- Day 05: Rest & Side trip Day (3540 m/11614 ft)
- Day 06: Trek to Yar kharka (4018 m/13182 ft) 4-5 Hrs Trek
- Day 07: Trek to Thorang High Camp (4925 m/16158 ft) 4-5 Hrs Trek
- Day 08: Trek to Muktinath (3780 m/12401 ft) via Thorang La pass (5416 m/17769 ft) 7-8 Hrs Trek
- Day 09: Drive from Muktinath to Tatopani (natural Hot Spring) by Local bus (1190 m/3904 ft) 5 Hrs Drive
- Day 10: Drive from Tatopani To Pokhara by Local Bus (820 m/2690 ft) 5 Hrs Drive
- Day 11: Drive Or Fly from Pokhara to Kathmandu & departure (1360 m/4461 ft) 7 Hrs Drive
Thorong La Pass Safety Guide: What Every Trekker Must Know
Altitude Sickness: The Real Danger
The main cause of serious problems on Thorong La Pass is Acute Mountain Sickness, also known as AMS, and its two more dangerous forms, HACE and HAPE.To understand how to stay safe and avoid altitude sickness in Nepal, read our full guide here. Knowing about these conditions is not something you can skip. It is essential before you even start packing your bag.
AMS Symptoms (mild, do not go any higher):
- Headache that does not go away even after taking paracetamol
- Feeling sick or throwing up
- Feeling dizzy or lightheaded
- Feeling much more tired than normal
- Sleeping badly
HACE Symptoms (serious, come down immediately):
- A very bad headache that will not go away
- Losing your balance, try walking in a straight line as a simple test
- Feeling confused or not thinking clearly
- Feeling extremely weak and tired
- Losing consciousness
HAPE Symptoms (serious, come down immediately):
- Feeling out of breath even when sitting still
- A dry cough that does not stop, sometimes with pink or frothy mucus
- Lips or fingernails turning blue
- A crackling or bubbling sound in your chest
The Golden Rules of Altitude Safety
- Never go higher if you have AMS symptoms. Wait until you feel completely better.
- If your symptoms get worse, come down straight away, even if it is the middle of the night.
- Come down at least 500 metres if your symptoms are serious.
- A medicine called Diamox can help your body adjust to the altitude. Talk to your doctor about it before you leave home.
- Never ignore what your body is telling you. No view, no summit, no photo is worth your life.
Emergency Procedures To Know Before You Go to Annapurna
- Helicopter rescue is available in Nepal and can reach most parts of the Annapurna Circuit when weather allows it cost you more
- The Himalayan Rescue Association has an office in Manang where you can get advice and check your health before going higher
- T.U. Teaching Hospital in Kathmandu is the best hospital for mountain related illness if you need care after coming down
- Make sure your travel insurance covers helicopter rescue up to at least $100,000 USD. This is not something to cut corners on.
Expert Guide Tips You Only Hear from Local Guides
After years of guiding trekkers across Thorong La Pass, here are the real insider tips that make the difference between a crossing you will remember with joy and one you will remember with pain.
1. Start Between 3am and 4am, No Later
Most of the problems on the pass happen to people who start too late in the morning. The afternoon winds on Thorong La can be extremely strong, with gusts reaching 60 to 80 kilometres per hour. The weather starts getting bad from midday onwards. The trekkers who have the safest and most enjoyable experience are always the ones who reach the summit before 9 am. Set your alarm, drink something warm, and get moving in the dark.
2. Sleep at High Camp, Not Thorong Phedi
High Camp sits at 4,925 metres and takes several hundred metres off your summit day climb. Yes, it means spending a night at a higher altitude, but with the right acclimatisation days already behind you, your body will be ready for it. Your summit day becomes much more comfortable and you arrive at the top with more energy in your legs.
3. Eat a Proper Meal the Night Before, Even If You Are Not Hungry
Being at high altitude makes many people lose their appetite completely. A lot of trekkers eat very little at High Camp and then feel completely drained halfway up the pass the next morning. Push yourself to eat carbohydrates like dal bhat, pasta, or rice. Your body needs that fuel to get you to the top.
4. Drink Plenty of Water Every Day From the Start
Not drinking enough water is one of the most common causes of altitude sickness and also one of the easiest to avoid. Drink at least 3 to 4 litres of water every day from the moment you arrive in Manang. Stay away from alcohol completely once you are above 3,000 metres. It dehydrates you faster than you think at altitude.
5. The Descent to Muktinath Is Just as Hard as the Climb
Every trekker puts all their focus and energy into reaching the summit. But after you cross the top and start coming down, the drop to Muktinath is over 1,600 metres of steep and rocky trail. By this point your legs are already tired and your knees will really feel every step. Use your trekking poles on the way down. Go slowly and steadily. This is where most injuries happen on the pass, not on the way up.
6. Carry Your Own Snacks to the Summit
High energy snacks like chocolate, nuts, dried fruit, and energy bars are very important for the summit push. The small tea stall at the top is not always open, especially early in the season or when the weather is bad. Do not count on it being there. Carry enough food in your pack to keep you going through the whole crossing.
7. Visit the Himalayan Rescue Association in Manang Before You Leave
Before you walk out of Manang and head toward the pass, stop at the HRA office and ask them about the current conditions up on the pass. The staff there get regular updates and will give you honest and straightforward advice about whether to go or wait. It takes 15 minutes and could genuinely save your life.
8. Never Cross the Pass Alone
Even very experienced trekkers should not attempt Thorong La without someone beside them. Conditions can change in minutes at this altitude. If you start feeling the signs of altitude sickness halfway up, you need someone who can make the call to turn around and help you get back down safely. A local guide who knows this pass well is the single best thing you can bring with you on this crossing.
9. Wear More Layers Than You Think You Need
The temperature at the summit can drop to between 15 and 25 degrees below zero when you add in the wind chill. Many trekkers feel warm and comfortable down in Manang and Yak Kharka and then get a serious shock when the cold hits them at the top. Even stopping still for a few minutes to take photos at the summit can make you feel the cold very quickly. Wear a full thermal base layer, a warm fleece, a down jacket, and a windproof and waterproof outer shell. Gloves and a warm hat covering your ears are not optional, they are essential.
10. Turning Back Is Not Failure, It Is Good Sense
The most experienced mountain climbers in the world will tell you the same thing. Knowing when to turn around is a sign of wisdom, not weakness. If you start showing clear signs of altitude sickness above High Camp, do not push yourself to the summit. The pass will still be there next year. Your health cannot be fixed at 5,200 metres. Come down, recover, and come back stronger.
Frequently Asked Questions,
How long does it take to cross Thorong La Pass?
Most trekkers take between 7 and 9 hours to go from High Camp to Muktinath. The climb to the summit takes around 4 to 5 hours. The walk down to Muktinath takes another 3 to 4 hours.
What is the altitude of Thorong La Pass?
Thorong La Pass stands at 5,416 metres, which is 17,769 feet above sea level.
Is Thorong La Pass open in December and January?
The pass can close because of heavy snowfall in December and January. It is possible to cross during these months but it comes with real risks and is only a good idea for experienced trekkers who are going with a local guide.
Do I need a guide for Thorong La Pass?
Yes, absolutely. At 5,416 metres, having an experienced local guide is not optional, it is the most important decision you will make for your safety on this trek.Book your trek with a guide here.
How do I get to Thorong La Pass from Kathmandu?
You drive to Besisahar and start the Annapurna Circuit trek from there, reaching the pass on day 10. Nepal Mountain Adventure handles all travel and planning from Kathmandu.
What permits do I need?
You need two permits, the ACAP Permit and the TIMS Card. When you book with Nepal Mountain Adventure, both are included in your package at no extra cost.
Ready to Cross Thorong La Pass?
Thorong La Pass is one of those experiences that stays with you long after you come home. The cold darkness before dawn, the slow and steady climb, the burning in your lungs, the prayer flags appearing out of the mist as you near the top, and then that moment when you are standing at 5,416 metres with the whole Himalayan world spread out around you. There is nothing quite like it.
Nepal Mountain Adventure has been guiding trekkers across Thorong La Pass and the full Annapurna Circuit since 2020. Our guides are local, experienced, and trained in high altitude first aid. They know this pass like the back of their hand and they will make sure you do too.
Our Annapurna Circuit packages start from just $1,015 and include all permits, an experienced local guide, accommodation along the trail, and full support throughout the journey.
Book the Annapurna Circuit Trek.
Nepal Mountain Adventure is a government registered trekking agency based in Kathmandu, Nepal. We are proud members of TAAN, the Trekking Agencies Association of Nepal, and are fully registered with the Nepal Tourism Board.Contact our team for a custom itinerary.
