Thorong La Pass Altitude: Height, Sickness Risks & Safety Tips

Thorong La Pass altitude is 5,416 m (17,769 ft), which makes it the highest point on the Annapurna Circuit.

Most trekkers focus on the view from the top. However, the height decides whether the day goes well or ends with a pounding headache and a long descent.

This guide explains what the altitude does, how real the risks are, and how beginners can plan a safer crossing!

Thorong La Pass Altitude Compared With the Rest of the Route

The pass height is only part of the story. The daily gain matters more!

Manang sits at 3,540 m, and Yak Kharka follows at about 4,000 m. Thorong Phedi comes next at 4,450 m, then High Camp at roughly 4,900 m. From there, you climb about 500 m more to reach Thorong La Pass.

After the top, the trail drops fast. Muktinath sits at roughly 3,800 m, so you lose about 1,600 m in one day. That drop is the best cure for altitude problems.

However, you must reach the pass first, and the crossing takes 10 to 12 hours!

What Happens to Your Body Above 5,000 m?

The air at 5,416 m holds the same share of oxygen as the air at sea level. The pressure is much lower, though.

Each breath delivers roughly half the oxygen you are used to. Your body reacts by breathing faster and pushing your heart rate up, and that adjustment takes days.

Acute mountain sickness (AMS) is the mild form. It starts with a headache plus nausea, dizziness, fatigue, or poor sleep.

The Wilderness Medical Society notes that the risk begins around 2,500 m. Most cases improve when you stop climbing and rest.

The serious forms are rarer but far more dangerous. High altitude cerebral edema (HACE) causes confusion and loss of balance. High altitude pulmonary edema (HAPE) brings breathlessness at rest and a wet cough. Both need immediate descent!

The Himalayan Rescue Association post in Manang shows the scale. Altitude illness occurred in 337 (11.6%) of 2904 visitors (2018-2023). Most had AMS, but 40 had HAPE, 11 had HACE, and 12 had both.

Well, these figures cover clinic visitors, not every trekker, so treat them as a guide rather than a trail-wide rate.

Has Anyone Died on Thorong La Pass?

Yes. The worst event happened on October 14, 2014, when the tail end of Cyclone Hudhud dropped heavy snow on Manang and Mustang.

At least 43 people died across the region, including trekkers, guides, and yak herders. Rescuers pulled out 518 people, and officials said many trekkers lacked enough clothing and food.

That was a storm disaster rather than a pure altitude event. Even so, it shows how quickly conditions turn above 5,000 m.

Altitude illness has also cost lives on this route, usually when people ignored symptoms and kept climbing.

Two lessons follow. Check the forecast before leaving High Camp, and never climb higher when symptoms get worse.

Is Thorong La Pass Difficult for Beginners?

It is hard, but beginners cross it every season!

The difficulty comes from the altitude and the long day, not from technical climbing. Fitness helps.

However, slow acclimatization matters more than strength, because fit trekkers who rush often get sick while steady walkers feel fine.

Therefore, spend a few weeks before departure on stair climbing and long hikes, and leave extra days in your itinerary.

Pro Tips to Avoid Altitude Sickness on Thorong La Pass

Beginners can cross the pass, and most do well when they follow a few firm rules. Use this checklist:

• Respect the 500 m rule. Above 3,000 m, the Wilderness Medical Society advises gaining no more than 500 m in sleeping altitude per day. It also advises a rest day every 3 to 4 days.

• Take a full acclimatization day in Manang. Hike higher during the day, then sleep back at 3,540 m.

• Do not skip Yak Kharka or Thorong Phedi. Big jumps between lodges raise your risk sharply.

• Attend the altitude talk in Manang. The Himalayan Rescue Association runs a free lecture there daily during the season.

• Drink 3 to 4 liters of water each day. Skip alcohol and sleeping pills, because both slow your breathing at night.

• Walk slowly enough to hold a conversation. Rushing at 5,000 m drains you fast.

• Ask your doctor about acetazolamide before you fly. Guidelines list it as the first-choice preventive drug for moderate to high-risk trips, and your doctor can advise on dosing.

• Report symptoms early. Descend if you have a worsening headache, vomiting, confusion, or breathlessness at rest.

How to Cross Thorong La Pass on the Big Day?

Most groups leave High Camp or Thorong Phedi between 4:00 and 5:00 a.m. This gets you over the pass before the afternoon wind builds.

Carry a headlamp, insulated gloves, a windproof shell, and trekking poles. Poles help a lot on the long descent, which punishes the knees!

Keep your water in an insulated bottle, since ordinary bottles freeze. Also, agree on a turnaround rule with your guide before you set off, especially if snow or wind picks up.

Do not linger at the top for long photos in freezing wind. Every 100 m you descend helps.

Best Season, Permits, and Practical Details

Autumn (September to November) and spring (March to May) give the most stable weather. Nights at High Camp still drop well below freezing in both seasons, and winter snow can close the pass.

Lodges near Thorong Phedi and High Camp fill quickly in peak weeks, so we at Everest Trekking Routes book ahead. In addition, carry enough rupees in cash, because mobile signal on this side of the circuit is patchy.

The main permit is the Annapurna Conservation Area Permit (ACAP), which costs NPR 3,000 for foreign nationals. TIMS card rules have changed several times.

Therefore, we confirm the current status before departure and handle the paperwork for you!

How We Build Altitude Safety Into Our Itinerary?

Our Annapurna Circuit itinerary follows the altitude rules from the start. We plan a full acclimatization day in Manang and keep sleeping gains modest through Yak Kharka and Thorong Phedi.

Moreover, we keep a spare day for weather, so nobody has to push over the pass in a storm.

We recommend a guide on this route, and our package includes one along with your permits. Your guide checks how you feel each morning and can call an early descent.

So, if you want your dates mapped against the altitude profile, contact our team and we will build the plan around your fitness and schedule!