Thorong La Pass (also spelled Thorang La or Thorung La) is a high mountain pass situated in the Damodar Himal, a sub-range of the Himalayas in Nepal.

The term "La" translates to "pass" in Tibetan, accurately describing its function as a corridor through the mountains. It is the highest point on the classic Annapurna Circuit trek, reaching an elevation of 5,416 meters (17,769 feet) above sea level.

Thorong La Pass : Key Details

Historical and Geographical Importance of Thorong La Pass

Historically, Thorong La served as a crucial trade route connecting the people of the Manang District with those in the Mustang District and the Kali Gandaki valley. For centuries, it facilitated the movement of goods and people across a challenging but vital Himalayan corridor.

Geographically, it acts as a dividing line. The eastern approach from Manang is characterized by greener, glaciated valleys, while the western descent toward Muktinath leads into an arid, rain-shadow landscape that resembles a high-altitude desert.

This descent enters the Kali Gandaki Valley, which lies between the Annapurna and Dhaulagiri massifs, forming one of the deepest gorges in the world. The pass offers panoramic views of surrounding Himalayan peaks, including Annapurna, Dhaulagiri, and Gangapurna.

Location and Annapurna Region Context

Thorong La Pass is located in north-central Nepal, with approximate coordinates of 28.8020° N, 83.9410° E. It connects the Manang District to the east with the Mustang District to the west, with the sacred site of Muktinath being the first major destination on the western side.

Within the context of the Annapurna Himalayan region and the Annapurna Circuit, the pass is the defining geographical challenge. The entire trek itinerary is often structured around the successful and safe crossing of Thorong La.

The journey to the pass takes trekkers through a diverse range of ecosystems and cultures, from the lush, temperate foothills to the high-altitude, Tibetan-influenced villages of Manang, and finally across the pass into the stark, beautiful landscapes of Upper Mustang.

Altitude, Difficulty and Weather Conditions

Altitude and Elevation Facts

The Thorong La Pass altitude is 5,416 meters (17,769 feet) above sea level, making it the highest point on the Annapurna Circuit and one of the highest trekking passes in the world. The Thorong La Pass elevation gain on the standard crossing day is significant.

Starting from Thorong Phedi (4,540 m) involves a climb of nearly 900 meters, and from High Camp (4,880 m), it is a 536-meter ascent to the summit.

Difficulty Level and High Altitude Risks

The primary factor defining the Thorong La Pass difficulty is the extreme altitude. The thin air at over 5,400 meters makes physical exertion substantially harder and poses serious health risks.

The most significant risk is Thorong La Pass altitude sickness, also known as Acute Mountain Sickness (AMS). This can range from mild headaches and nausea to life-threatening conditions like High-Altitude Pulmonary Edema (HAPE) or High-Altitude Cerebral Edema (HACE).

The risk is compounded by the fact that the crossing day is long, typically taking 8-10 hours, leaving little room for error. The terrain itself adds to the challenge, consisting of rocky paths, potential ice patches, and a steep, slippery descent on the western side towards Muktinath.

Weather Patterns (Temperature, Snow, Wind)

Thorong La Pass weather is notoriously harsh and unpredictable. Thorong La Pass temperature can plummet well below freezing, even during the recommended trekking seasons.

It is not uncommon for temperatures at the pass to range from -5°C to -15°C (23°F to 5°F) in the early morning, with wind chill making it feel much colder.

Thorong La Pass snow conditions vary by season.

• In spring (March-May), snow from the winter remains, and fresh snowfall is possible.
• In autumn (Sept-Nov), the trail is generally clearer but can still have ice.
• Thorong La Pass winter trekking (Dec-Feb) is extremely challenging and often not advised due to heavy snowfall, which can block the pass and increase avalanche risk.

Strong winds are a constant factor, typically picking up in the afternoon. These Thorong La Pass conditions can lead to whiteouts and storms that appear rapidly, drastically reducing visibility and increasing the risk of hypothermia and frostbite.

Key Safety Tip

A critical strategy for managing these combined risks is to start the crossing very early in the morning (between 3 AM and 5 AM) to reach the pass before the strong afternoon winds and potential weather deterioration set in.

Checking the latest weather forecast in Manang before attempting the crossing is essential. Proper acclimatization, adequate hydration, and recognizing the early signs of altitude sickness are non-negotiable for a safe crossing.

Routes, Distances and Navigation Guide

Manang to Thorong La Pass Route

The standard Thorong La Pass route on the Annapurna Circuit is typically trekked from east to west (Manang to Muktinath), as this direction allows for better acclimatization.

The journey from Manang to Thorong La Pass is broken into stages over two or three days to manage altitude gain.

From Manang (3,540 m), the trail ascends to Yak Kharka (4,110 m), and then to Thorong Phedi (4,540 m). This section involves a steady climb along the Jarang Khola valley.

The terrain is a mix of rocky paths and moraine, with views of the Gangapurna Glacier. The total Thorong La Pass distance from Manang to Thorong Phedi is approximately 8-9 kilometers, taking around 4-5 hours to walk.

Thorong Phedi to High Camp Section

The segment from Thorong Phedi to High Camp is short but steep, gaining about 340 meters in elevation over a distance of roughly one kilometer. This section can take about an hour to ninety minutes.

High Camp Annapurna Circuit (4,880 m) is a cluster of basic teahouses situated on a ridge. Staying here shortens the crossing day significantly but can be challenging due to the high altitude and basic facilities. The trail here is a well-defined but rugged path that zigzags up the mountainside.

Muktinath to Thorong La Descent

While the primary route is crossed from east to west, understanding the Muktinath to Thorong La Pass ascent is relevant for navigation and planning. The western approach from Muktinath (3,800 m) is a long, sustained climb of over 1,600 meters to the pass.

This side is notably more arid and exposed, with a steep, loose, and rocky trail that is generally considered more challenging for ascent than the eastern side. The descent from the pass to Muktinath is often cited as the most strenuous part of the crossing day due to its relentless, steep gradient, which can be hard on the knees.

Navigation and Key Landmarks

The Thorong La Pass route is a well-established trail. From High Camp, the path ascends across a high-altitude plateau before a final steep section leads to the pass summit. The summit is identifiable by stone chortens (Buddhist shrines) and prayer flags.

• The primary navigation challenge is the terrain, not route-finding. Key sections require caution:
• The final ascent to the pass can have ice patches and loose scree.
• The initial western descent from the pass is a steep, zigzagging trail on loose rock and can be slippery.

Important Considerations

The section immediately after the pass on the descent is a high-risk area for slips and falls, especially if icy. It is crucial to start the crossing from the east side very early in the morning (3-5 AM) to ensure most of the ascent is completed before the strong afternoon winds pick up and to have ample daylight for the long descent.

Thorong La Pass Trek Itinerary

This itinerary outlines the standard route for crossing the Thorong La Pass as part of the classic Annapurna Circuit. This is also the general outline of Trek Me Nepal's standard 14 day to 16-day packages. It follows the recommended east-to-west direction for optimal acclimatization.

The core trekking segment from Jagat to Muktinath typically spans 10-12 days. The following daily breakdown covers the essential stages leading to and from the Annapurna Circuit highest point.

Detailed Day-by-Day Thorong La Pass Itinerary

Days 1-3: Approach to the Annapurna Region

Day 1: Arrival in Kathmandu.
Day 2: Drive from Kathmandu to Besisahar, then by shared jeep to Jagat (approx. 1,300m).
Day 3: Trek from Jagat to Dharapani (1,860m). The trail passes through forests and villages, following the Marsyangdi River.

Days 4-6: Acclimatization and Ascension

Day 4: Trek from Dharapani to Chame (2,650m), the district headquarters of Manang.
Day 5: Trek from Chame to Upper Pisang (3,300m). The route offers views of Annapurna II and passes through apple orchards.
Day 6: Trek from Upper Pisang to Manang village (3,540m). This day provides significant Himalayan vistas and a noticeable change in landscape.

Acclimatization Stops (Manang)

Day 7: Acclimatization day in Manang. This is a mandatory rest day for altitude adaptation. Activities include a short hike to Gangapurna Lake or visiting the local monastery to aid the acclimatization process.

Days 8-9: Final Approach to the Pass

Day 8: Trek from Manang to Yak Kharka (4,020m). This is a shorter day, allowing for a gradual ascent.
Day 9: Trek from Yak Kharka to Thorong Phedi (4,450m) or Thorong High Camp (4,880m). This stage involves a steady climb through an arid landscape.

High Camp vs Phedi Overnight

The choice between staying at Thorong Phedi or High Camp is a key decision.

• Thorong Phedi (4,450m): Staying here results in a longer, more strenuous crossing day but allows for sleep at a slightly lower altitude, which can be beneficial for some trekkers.
• High Camp (4,880m): Staying here shortens the ascent on crossing day but involves sleeping at a very high altitude, which can increase the risk of altitude sickness.

Day 10: Crossing Thorong La Pass (5,416m) & Descent to Muktinath

• This is the most challenging day. The trek begins very early (3-5 AM) to avoid afternoon winds.
• The ascent from the overnight stop to the pass takes approximately 4-6 hours. The summit is marked by prayer flags.
• After the pass, the long descent to Muktinath (3,800m) begins, taking another 3-4 hours. The total trekking time is typically 7-10 hours.

Days 11-14: Descent and Return

Day 11: Trek from Muktinath to Jomsom (2,700m), passing through Kagbeni.
Day 12: Fly from Jomsom to Pokhara (or drive via Tatopani in longer itineraries).
Day 13: Drive from Pokhara to Kathmandu.

Day 14: Final departure.

Sample Timetable for Crossing Day (From High Camp)

4:00 AM: Wake up and have a light breakfast.
4:45 AM: Begin ascent with headlamps.
8:00-9:30 AM: Reach Thorong La Pass (5,416m). Short rest.
9:30 AM: Begin descent to Muktinath.
1:00-2:00 PM: Arrive in Muktinath for lunch and overnight rest.

If you like this itinerary, check out our 14 Days Annapurna Circuit Trek and 16 Days Annapurna Complete Circuit Trek standard packages for detailed information.

Best Time and Seasonal Guide for Crossing Thorong La Pass

Best Time to Cross Thorang La Pass

The best time to cross Thorong La Pass falls within two primary trekking seasons in the Nepal Himalayas: the Thorong La Pass spring season (March to May) and the Thorong La Pass autumn season (September to November). These periods offer the most stable weather and clearest trail conditions for a safe crossing.

Seasonal Breakdown of Weather

The feasibility and difficulty of the crossing are directly determined by seasonal weather patterns.

Key Considerations

• Packing: Essential gear must be adapted to the season. In autumn and spring, sub-zero rated sleeping bags and layered clothing are crucial. In winter, expedition-level cold-weather gear is mandatory.
• Why Spring and Autumn are Preferred: These seasons provide a balance of manageable temperatures, lower precipitation, and stable atmospheric conditions, which significantly reduces the risks associated with high-altitude trekking.
• Final Recommendation: For the highest probability of a safe and successful crossing, the windows of April to early May and late September to November are strongly advised.

Safety, Risks and High Altitude Preparation for Thorang La Pass

Thorong La Pass Risks

The primary Thorong La Pass risks are related to its extreme altitude, harsh weather, and remote location. Key objective hazards include altitude sickness, avalanches, rapidly changing weather leading to whiteouts, and difficult terrain. A blizzard in 2014, for example, caused significant snowfall and fatalities, highlighting the potential severity of conditions.

AMS, HAPE, HACE, Dehydration Risks

The most critical health concern is Thorong La Pass altitude sickness, clinically known as Acute Mountain Sickness (AMS). This can progress to life-threatening conditions:

• High-Altitude Pulmonary Edema (HAPE): Fluid buildup in the lungs, characterized by severe breathlessness at rest, a persistent cough (sometimes with pink, frothy sputum), and extreme fatigue.
• High-Altitude Cerebral Edema (HACE): Fluid buildup in the brain, characterized by severe headache unresponsive to painkillers, loss of coordination (ataxia), confusion, and vomiting.
• Dehydration: The dry, cold air and physical exertion increase the risk of dehydration, which can worsen the symptoms of AMS.

Avalanche and Snow Conditions

Thorong La Pass avalanche risk is a significant objective danger, particularly in winter and spring when snowfall is heavy. The steep slopes on the approach to the pass can accumulate unstable snow layers. This risk is generally lower during the stable autumn season but can never be fully ruled out.

Safety Tips, Emergency Response

Adhering to Thorong La Pass safety tips is non-negotiable for a safe crossing.

• Acclimatization: This is the most critical preventive measure. Follow a gradual ascent profile, typically gaining no more than 300-500 meters in sleeping altitude per day above 3,000 meters. The scheduled rest day in Manang is essential for this process.
• Hydration and Nutrition: Drink plenty of fluids and consume a high-calorie diet, even if appetite diminishes.
• Recognize Symptoms: Be aware of the early signs of AMS (headache, nausea, dizziness, fatigue) in yourself and others. Do not ignore them.
• Emergency Response: The only definitive treatment for severe AMS, HAPE, or HACE is immediate descent. Evacuation in this remote area is difficult and may require helicopter rescue, which is why specialized travel insurance is mandatory.

Training for Thorong La Pass

Training for Thorong La Pass should focus on building excellent cardiovascular endurance and leg strength.

• Cardiovascular Training: Activities like running, cycling, and stair climbing for several months prior to the trek are essential.
• Strength and Stability: Focus on leg muscles (quadriceps, hamstrings, calves) and core strength. Training with a loaded backpack on uphill trails is highly recommended to simulate trekking conditions.
• Mental Preparation: The crossing day is long and demanding. Mental resilience is as important as physical fitness.

Insurance

Comprehensive travel insurance is a mandatory requirement. The policy must explicitly cover emergency high-altitude helicopter evacuation up to 6,000 meters and medical expenses related to altitude sickness. Standard travel insurance often excludes these activities.

Trekking Gear, Packing List and Preparation Guide

A comprehensive Thorong La Pass packing list is critical for safety and comfort. The right Thorong La Pass gear list must account for sub-zero temperatures, strong winds, and potential snow. The following checklist is categorized for clarity.

Essential Clothing for Subzero Conditions

Layering is the most effective system for managing body temperature in rapidly changing conditions.

Winter vs Autumn Gear Differences

The core system remains the same, but the intensity of specific items changes.

• Autumn: A medium-weight insulated jacket may suffice. Lighter-weight base layers can be suitable.
• Winter: A heavy-weight expedition-grade insulated jacket, thicker thermal base layers, and expedition-grade mittens are necessary. Insulated, waterproof over-boots may be required.

Backpack Checklist

A 40-60 liter backpack is typically sufficient, carried by you or a porter, with a smaller daypack for essentials.

• Essentials: Sleeping bag (rated to at least -10°C / 14°F), sleeping bag liner, trekking poles (highly recommended for ascent and descent), headlamp with extra batteries, water bottles or hydration bladder (insulate to prevent freezing), high-SPF sunscreen, lip balm, sunglasses (UV protection).
• Personal Items: Personal first-aid kit including blister treatment, water purification tablets, toiletries, quick-dry towel, toilet paper.

Electronics and Communication

• Power: Power banks are essential as charging facilities become expensive and unreliable at higher teahouses.
• Communication: Mobile network coverage is sparse and disappears entirely around Thorong Phedi and High Camp. A satellite messenger can be considered for emergency communication.
• Photography: Cameras and phones are sensitive to cold. Keep them insulated and close to your body to preserve battery life.
• Weight Optimization Tip: Pack only what is necessary. Every extra kilogram adds strain, especially at high altitude. Evaluate each item for its utility. Luxury items should be minimal.

Trekking Permits, Costs and Booking Options

ACAP Permit and TIMS Card Nepal

Two permits are legally required for the Annapurna Circuit trek:

• Annapurna Conservation Area Permit (ACAP): This permit funds conservation and community development within the Annapurna region.
• Trekker's Information Management System (TIMS) Card: This card is used for trekker safety and record-keeping.

Both permits can be obtained in Kathmandu or Pokhara at the respective tourism board offices. You will need your passport and passport-sized photographs. Your trekking agency will typically handle this process for you.

Thorong La Pass Trek Cost Breakdown

The total Thorong La Pass trek cost can be broken down into several components. The final amount depends on your choice between an independent or guided trek.

• Permits: Fixed cost for ACAP and TIMS card.
• Accommodation: Cost per night for teahouse lodging. Prices increase with altitude.
• Meals: All meals (breakfast, lunch, dinner) are paid for separately throughout the trek.
• Transportation: Includes cost of travel from Kathmandu to the trailhead (Besisahar/Jagat) and return from the endpoint (Jomsom/Pokhara), which may involve both road transport and a flight.
• Guide and Porter Fees: Daily rates for their services.
• Miscellaneous: Costs for battery charging, Wi-Fi, hot showers, and bottled water, which also increase with altitude.

Guide and Porter Hiring

Hiring a guide or porter is a personal decision with many advantages.

• Hire guide for Thorong La Pass: A licensed guide provides navigation, handles logistics, assists with language barriers, and enhances safety through their knowledge of altitude sickness and trail conditions.
• Porter: A porter carries the main bulk of your luggage (typically up to 15-20 kg), allowing you to trek with only a daypack. This significantly reduces physical strain and can improve acclimatization.

Rates are set on a per-day basis and are regulated. It is standard practice to also cover their food and accommodation during the trek.

Read more about porter here.

How to Book Thorong La Pass Trek ?

There are two primary methods to book Thorong La Pass trek:

• Independent Trekking: You arrange all logistics yourself, including transport, accommodation, and meals. This offers maximum flexibility but requires thorough research and personal management of all risks and permits.
• Guided Trekking Package: You book a pre-arranged Thorong La Pass trek package through a registered company like Trek Me Nepal. This option includes guides, porters, permits, accommodation, meals, and transport as per the itinerary.
• Cost-Saving Tips: Traveling in a small group, booking during shoulder seasons, and comparing package inclusions from different agencies can help manage the Annapurna Circuit trek cost.
• Payment Safety: When booking a package, use secure payment methods and ensure you receive a detailed contract outlining all services included and excluded.

Cultural, Religious and Scenic Highlights Around Thorong La

Manang Culture and Traditions

Manang village is a significant settlement in the Annapurna region, situated at 3,540 meters. The culture is heavily influenced by Tibetan Buddhism, evident in its traditional stone houses, ancient monasteries, and prayer flags.

The local community has a distinct identity, with a history of trade and a unique set of customs and traditions. The village serves as a primary acclimatization stop, allowing trekkers to observe the local lifestyle and visit the village's monastery.

High Camp Landscapes

The area around High Camp (4,880m) is characterized by a stark, high-altitude landscape. The terrain is rocky and arid, with minimal vegetation. The primary features are the dramatic, close-up views of surrounding peaks like Thorung Peak and the deep valleys below.

The location provides a clear perspective of the challenging ascent to the pass.

Muktinath Temple

Muktinath temple is a sacred site located in the Mustang district at 3,800 meters. It is a pilgrimage destination of great importance for both Hindus and Buddhists. For Hindus, it is one of the eight sacred shrines, or Svayam Vyakta Kshetras.

The temple complex features 108 water sprouts, shaped like bull's heads, and a perpetual flame fed by natural gas, which are central to its religious significance. For Buddhists, the site is known as Chumig Gyatsa, which means 'Hundred Waters'.

Connection to Upper Mustang

After descending from Thorong La Pass, trekkers enter the Upper Mustang side of Thorong La. This marks a dramatic geographical and cultural shift. The landscape transforms from the greener, glaciated valleys of Manang into an arid, rain-shadow region resembling a high-altitude desert.

This area is part of the Kali Gandaki Valley, one of the deepest gorges in the world. The culture here also shows strong Tibetan influences, with a more pronounced arid-mountain character.

Check out our standard Mustang treks here.

Jomsom to Muktinath

The trail from Jomsom to Muktinath is part of the descent route on the western side of the pass. This section passes through the Kali Gandaki river valley, known for its strong afternoon winds.

The trail connects the district headquarters of Mustang, Jomsom, to the sacred site of Muktinath, passing through other notable villages like Kagbeni, which is the gateway to the restricted area of Upper Mustang.

FAQs, Tips and Final Expert Advice

Q: What is the best time to cross Thorong La Pass?

A: The optimal periods are the spring (March to May) and autumn (September to November) seasons. These windows offer the most stable weather and clearest trail conditions.

Q: How difficult is the Thorong La Pass trek?

A: The trek is considered moderately difficult to challenging. The primary difficulty stems from the high altitude (5,416m), the long crossing day (7-10 hours), and potential for harsh, cold weather. Prior trekking experience is beneficial but not mandatory with proper preparation.

Q: Is a guide necessary for the Annapurna Circuit?

A: While not legally mandatory, hiring a guide is highly recommended, especially for first-time trekkers. A guide provides critical support with navigation, acclimatization, language, and managing high-altitude risks.

Q: What are the symptoms of altitude sickness?

A: Early symptoms include headache, dizziness, nausea, loss of appetite, and fatigue. Severe symptoms indicating HAPE or HACE are breathlessness at rest, a persistent cough, confusion, and loss of coordination. Immediate descent is the only cure for severe AMS.

Q: What permits are required?

A: The Annapurna Conservation Area Permit (ACAP) and the Trekkers' Information Management System (TIMS) card are required. These can be obtained in Kathmandu or Pokhara.

Q: What is the accommodation like on the trek?

A: Accommodation is in teahouses, which are basic mountain lodges. They offer a bed, blanket, and shared dining area. Rooms are typically twin-share with basic shared toilet facilities. Quality and amenities decrease as you gain altitude.

Final Trekking Tips

• Acclimatization: Do not rush. Adhere to the recommended ascent profile and take the scheduled rest day in Manang seriously. "Climb high, sleep low" is a good practice.
• Water Safety: Drink plenty of fluids to stay hydrated. Use water purification tablets or a filter to treat water from local sources, which is more sustainable and cost-effective than buying bottled water.
• Trail Etiquette: Yield to yaks and mule trains by moving to the uphill side of the trail. Walk single file on narrow paths to allow others to pass.
• Pacing: Maintain a slow, steady pace that allows you to hold a conversation. This conserves energy and aids acclimatization.
• Local Food: The menus in teahouses are largely similar, offering Nepali staples like dal bhat (lentil soup and rice), noodles, and potatoes. Dal bhat is often the most hygienic and energy-efficient option.

Final Takeaway

For first-time trekkers, thorough physical preparation, investing in a qualified guide, and prioritizing acclimatization over speed are the most critical factors for a safe and successful crossing of Thorong La Pass. Consulting with experienced trekking agencies for the latest trail conditions and logistics is strongly advised.

Book your Annapurna Trek or Upper Mustang Trek, which includes the Thorong La Pass, with Trek Me Nepal. We have many standard packages you can choose from including our 14 Days Annapurna Circuit Trek and 16 Days Annapurna Complete Circuit Trek . We can also customise your trek according to your personal needs.

Bipin Thapa

Operation Manager | Official Trekking Guide

Anyone who has trekked before knows trekking requires planning, and a deep understanding of the land. That is where Bipin Thapa Magar comes in. As the Operations Manager at Trek Me Nepal, he is the ba... Read More