Lumba Sumba Pass Trek Guide

Overview

The Lumba Sumba Pass trek is one of the great hidden journeys of the Nepal Himalaya, a remote, mostly camping expedition through the far north-east of the country, threading a high crossing between two of Nepal's mightiest mountain regions. It forms a key link on the Great Himalaya Trail, joining the Kanchenjunga Base Camp area in the east with the Makalu Base Camp region to the west, over the Lumba Sumba Pass (around 5,160 m). Where the busier base-camp trails carry a steady stream of trekkers, here you can walk for days and meet almost no one.

The route spans the Taplejung and Sankhuwasabha districts of Koshi province, climbing the upper Tamor valley on the Kanchenjunga side, past the old Tibetan trading village of Olangchung Gola, up to the pass, then descending the wild Arun valley toward the Makalu region. It lies within the Kanchenjunga Conservation Area (KCAP) and edges the Makalu-Barun National Park, passing through forests, glacial valleys and high pastures that see only a trickle of visitors each year.

Culturally the trek is just as rich as it is scenic. The lower and middle valleys are home to Limbu communities, while the high settlements such as Olangchung Gola are Sherpa and Tibetan-influenced, with gompas, mani walls and a way of life shaped by centuries of trans-Himalayan trade with Tibet. This is one of the few places in Nepal where you still feel close to the old salt-and-wool trading routes.

Most people complete the trek in 16 to 20 days, including the eastern flights and drives to and from the trailheads. It is graded strenuous: the days are long, the logistics are camping-based, there is very little infrastructure, and the pass itself is high, exposed and committing. For experienced, self-sufficient trekkers seeking genuine wilderness rather than lodge comfort, the Lumba Sumba Pass is one of the most rewarding routes in the country.

Day-by-Day Itinerary

This is a representative Lumba Sumba Pass itinerary built around acclimatisation and the long, remote approach. Because the trek is almost entirely camping with very few teahouses, the schedule is run by an agency with a full crew, and the exact daily stages vary with weather, group fitness and trail conditions. The trek begins and ends with a flight between Kathmandu and eastern Nepal, plus long jeep drives to and from the trailheads.

Day 1: Fly Kathmandu to Bhadrapur, drive toward Taplejung

A scenic flight east to Bhadrapur in the Terai, then a long, winding jeep drive up into the hills of the Taplejung district. (Some itineraries fly directly to Taplejung's Suketar airstrip when flights are operating.)

Day 2: Drive to the Tamor valley trailhead (Suketar / Chiruwa area)

Continue by road to the roadhead in the Tamor valley, around the Suketar and Chiruwa area, where the walking begins. The approach follows the river deep into the Kanchenjunga Conservation Area.

Day 3: Trek up the Tamor valley

A long valley day climbing gently alongside the Tamor River through subtropical forest and scattered Limbu villages, with the first big peaks beginning to show ahead. (5-7 hours.)

Day 4: Continue up the Tamor toward Lelep / Gola country

Steady ascent through forest and terraced hamlets, crossing suspension bridges as the valley narrows and the culture shifts gradually from Limbu farming villages toward higher Sherpa and Tibetan-influenced country. (6-7 hours.)

Day 5: Climb toward Olangchung Gola

A demanding climbing day through dense rhododendron and pine forest, gaining height into the upper Tamor and approaching the historic trading area. (6-7 hours.)

Day 6: Reach Olangchung Gola

Arrive at Olangchung Gola, a centuries-old Tibetan trading village with an important Buddhist gompa, mani walls and stone houses, set high in the upper Tamor near the old route to Tibet. A highlight of the trek. (4-5 hours.)

Day 7: Acclimatisation day at Olangchung Gola

An essential rest and acclimatisation day before the high country. Explore the village and gompa and take a short hike higher up the valley to aid acclimatisation.

Day 8: Trek up toward the high camp below the pass

Climb above the tree line into glacial terrain of moraine, alpine meadows and tumbling streams, moving toward a high camp on the approach to the Lumba Sumba Pass. (5-7 hours.)

Day 9: Establish high camp before the pass

A shorter but high day pushing the camp closer to the pass, with big views opening across the upper valleys. Rest, hydrate and prepare for an early start on the crossing. (3-4 hours.)

Day 10: Cross the Lumba Sumba Pass (around 5,160 m)

The crux of the trek: an early, demanding crossing of the Lumba Sumba Pass (around 5,160 m), the high point linking the Kanchenjunga and Makalu watersheds, with sweeping panoramas of the surrounding Himalaya before a long descent on the Arun side to camp. Exposed to wind, snow and weather. (7-9 hours.)

Day 11: Descend into the upper Arun valley

Continue the descent off the high country, dropping through alpine pasture and moraine into the head of the Arun valley on the Makalu side, leaving the glacial zone behind. (6-7 hours.)

Days 12-14: Down the Arun valley toward Num / Tumlingtar

Follow the Arun valley downstream through forest, herders' kharkas and small villages, losing height steadily and returning to greener, warmer country as the trail edges the Makalu-Barun National Park toward the Num area. (5-7 hours each day.)

Days 15-16: Trek to the roadhead and drive to Tumlingtar

Reach the lower Arun roadhead and take a long jeep drive to Tumlingtar, the eastern airstrip town, for your final night before flying out. (Drive timings vary with road conditions.)

Day 17: Fly Tumlingtar to Kathmandu

Fly from Tumlingtar back to Kathmandu. Build in a contingency day or two at each end, as eastern flights are weather-dependent and can be delayed.

Difficulty & Fitness

The Lumba Sumba Pass trek is graded strenuous and is suited only to fit, experienced and self-sufficient trekkers. It is a serious wilderness undertaking rather than a lodge trek.

• Remoteness. This is one of the most isolated trekking regions in Nepal, with very few trekkers, little infrastructure and almost no road bailout once you are committed to the high valleys. Self-sufficiency and a strong crew are essential.
• Camping logistics. The route is mostly camping, with only a few basic teahouses on the lower sections. You depend on a full team of guide, cook and porters carrying tents, food and gear.
• Long days. Daily distances are long and the trail climbs and drops steeply between the Tamor valley, the high pass and the Arun valley, often on rough, faint paths.
• A high, committing pass. The Lumba Sumba Pass (around 5,160 m) is the high point and is exposed to wind, snow and sudden weather, with a big day and an early start to cross it safely.
• Altitude. You spend several nights at high altitude approaching and crossing the pass, so proper acclimatisation days are non-negotiable.

You should be comfortable walking 6-9 hours a day on rough trails for two to three weeks, and ideally have completed a high-altitude trek to around 5,000 m before. Train with long hill walks, stair climbs and loaded day-pack hikes for at least a couple of months beforehand, and be prepared for the discomforts of camping in cold, remote conditions.

Permits & Regulations

Because the Lumba Sumba Pass trek spans two protected areas and crosses a restricted region, the permit requirements are more involved than on the popular base-camp routes. You will typically need:

• Kanchenjunga Conservation Area (KCAP) permit, around NPR 2,000 for the Kanchenjunga side of the trek.
• Makalu-Barun National Park entry permit, around NPR 3,000, since the route descends into the Makalu region.
• Restricted-area permit (Kanchenjunga side), around USD 20 per person per week. This requires a minimum group of two trekkers (no solo trekking) and must be arranged through a registered agency.
• TIMS card (Trekkers' Information Management System), arranged through a registered trekking agency.

Because the Kanchenjunga side is a restricted area, a licensed guide is required and you cannot trek solo, you must go in a group of at least two through a registered agency. Carry your passport and several passport photos, and keep permits handy for checkpoints. Permit rules, fees and zone boundaries change from time to time, so confirm the current requirements with a registered agency or the Nepal Tourism Board before you travel.

Cost & Budget

The Lumba Sumba Pass trek is more expensive than the popular base-camp treks, mainly because of its length, remoteness, the eastern flights and drives, and the full camping crew needed to support the route.

• Guided camping package: typically around USD 1,800-3,000 per person, depending on group size, length and standard. This generally covers the guide, cook and porters, camping equipment and food, permits, eastern flights and ground transport.
• Domestic flights: Kathmandu to Bhadrapur or Taplejung at the start and Tumlingtar to Kathmandu at the end are a significant cost and are weather-dependent.
• Permits: the Kanchenjunga Conservation Area permit (around NPR 2,000), the Makalu-Barun National Park permit (around NPR 3,000), the restricted-area permit (around USD 20 per week) and TIMS.
• On-trail spending: carry enough Nepali rupees in cash for the whole trek, there are no ATMs in this remote region, and you will need cash for extras, tips and any small purchases.

Costs climb with the length and remoteness of the route, and a generous tip for the crew carrying loads over the high pass is customary. Budget a contingency for delayed eastern flights and possible extra nights.

Best Time to Trek

There are two trekking seasons for the Lumba Sumba Pass, and the choice between them matters here because of the high, exposed pass.

• Spring (March-May) brings warming days, blooming rhododendron forests on the lower trail and generally good views, with the pass becoming more reliably crossable as winter snow clears.
• Autumn (October-November) is the most stable season: clear skies, the sharpest mountain views and firm trails after the monsoon. This is a prime window for the high crossing.

Avoid the monsoon (June-September): the lower forest is wet, slippery and thick with leeches, landslides are a risk on the rough roads and trails, and cloud hides the mountains. Winter (December-February) is generally too cold and snowy on the high pass for most trekkers, with the Lumba Sumba Pass often snow-blocked. For the best balance of weather, views and safety, plan for spring or autumn.

Packing, Safety & Tips

Acclimatisation

With several nights at high altitude approaching and crossing a pass of around 5,160 m, altitude sickness is a real risk. Keep the built-in acclimatisation day (for example at Olangchung Gola), ascend slowly, stay hydrated, avoid alcohol high up, and watch for headache, nausea and dizziness. If symptoms worsen, descend, and remember that on this remote route descent and rescue both take far longer than on busier trails.

Gear & packing

Pack as you would for a high, cold camping trek: a warm sleeping bag rated well below freezing, an insulated sleeping mat, a good down jacket, layered clothing, sturdy broken-in boots, trekking poles, sun and snow protection, gaiters and a headlamp. Because there is virtually no infrastructure, bring a reliable water-purification method, basic snacks and a first-aid kit including blister care and altitude medication discussed with your doctor. For the wet lower forest in shoulder seasons, pack leech protection and waterproofs.

Communications & money

Phone signal is patchy to non-existent for much of the trek, so many groups carry a satellite phone or communication device for emergencies. There are no ATMs in the region, so carry enough cash for the entire trek plus a buffer for flight delays.

Safety & insurance

Buy comprehensive travel insurance that explicitly covers trekking to at least 5,200 m and includes helicopter evacuation, a rescue from these remote valleys is both essential and expensive without cover. Trek with a licensed guide and a competent crew who know the pass and the weather, keep contingency days for flight delays, and stay weather-aware on the exposed Lumba Sumba crossing.

Combining with other treks

The Lumba Sumba Pass is itself a connecting route on the Great Himalaya Trail, so it pairs naturally with the regions at either end. Strong, experienced trekkers sometimes extend it with a side trip toward Kanchenjunga Base Camp at the eastern end, or link the descent into the Makalu Base Camp region to the west. For most people, though, it is a serious standalone expedition best taken on after building up through other high-altitude treks. Base yourself in Kathmandu before and after to arrange permits, flights and gear with your agency.