Last updated September 21, 2026
The Deadliest Avalanches in Mountaineering
The deadliest single avalanche in well-documented modern mountaineering history struck Peak Lenin on July 13, 1990, when an earthquake dislodged séracs above Camp II and killed 43 of the 45 climbers there. But the larger record is not one type of accident: climbers have died in slab avalanches, powder avalanches, serac-triggered ice avalanches and earthquake-triggered releases, often while sleeping in high camps or carrying loads through unavoidable hazard zones.
What was the deadliest avalanche in mountaineering history?
The July 13, 1990 Peak Lenin disaster is the deadliest well-documented avalanche to strike a mountaineering expedition population. An earthquake centered in Afghanistan dislodged séracs above Camp II on the 7,134 m Pamir peak. The resulting avalanche swept the camp and killed 43 of 45 climbers. The American Alpine Journal described it as probably the greatest number of fatalities in a single mountaineering accident in history. This roundup ranks expedition avalanches—not civilian disasters—so Huascarán/Yungay 1970 is discussed separately rather than mixed into the table.
Fourteen Benchmark Avalanche Disasters
This is a benchmark ranking of major, well-documented avalanche and ice-avalanche incidents involving expedition populations. It is not a claim that every avalanche fatality on every mountain since the beginning of alpinism is represented.
What Counts as a “Mountaineering Avalanche” Here?
Without a counting rule, a ranking like this becomes meaningless. The list is based on the population exposed and the physical incident—not simply whether a headline used the word “avalanche.”
Expedition populations
Climbers, guides, Sherpas, high-altitude workers, porters and expedition staff at base or high camps.
The key test is direct participation in a climbing expedition.Snow, ice & serac avalanches
Slab avalanches, powder avalanches, ice avalanches and serac collapses that generate avalanche flow are included.
The mechanism is stated for each event.Earthquake-triggered events
Peak Lenin 1990 and Everest 2015 qualify because the earthquake triggered an avalanche directly into an expedition population.
Trigger and impact population are separate questions.Civilian disasters
Yungay 1970 is one of history’s deadliest mountain mass movements, but its victims were overwhelmingly civilians below Huascarán.
It belongs in regional disaster history, not this climbing ranking.Mixed-mechanism disasters
K2 2008 involved a serac collapse but deaths followed through cut fixed ropes, falls, stranding and exposure.
It is not ranked as a clean single-avalanche toll.Season totals
An entire season with many unrelated deaths is not one avalanche incident.
Use the deadliest-season roundup for that question.The Worst Climbing Avalanches Cluster in High Asian Ranges
Most of the largest single-event tolls occurred where big expedition populations spent long periods beneath hanging ice, avalanche paths or heavily loaded slopes. Peak Lenin sits farther north in the Pamirs; Broad Peak is in the Karakoram; most of the rest cluster across the Himalaya.
Key disaster mountains
The ranking spans nearly a century and several distinct mountain systems.
The Deadliest Avalanches in Mountaineering
Ties share the same numerical rank. Counts are the best-supported event totals under the inclusion rule above; Everest 2015 is explicitly labeled with its Base Camp reporting method because historical datasets differ.
| Rank | Mountain / year | Deaths | Where | Mechanism | Why it matters |
|---|---|---|---|---|---|
| 1 | Peak Lenin · 1990 | 43 | Camp II | Earthquake dislodged séracs; avalanche swept camp | 43 of 45 climbers at camp died; AAC calls it probably the largest single mountaineering accident toll. |
| 2 | Everest · 2015 | 19 reported | Base Camp | M7.8 Nepal earthquake triggered avalanche / air blast | Uses the Nepal Mountaineering Association Base Camp count; other databases can show different totals. |
| 3 | Kang Guru · 2005 | 18 | Base Camp | Giant powder-snow avalanche after prolonged snowfall | Seven French climbers and 11 Nepalese expedition employees were killed. |
| 4 | Everest · 2014 | 16 | Khumbu Icefall | West Shoulder serac collapse triggered ice/snow avalanche | All victims were Nepali expedition workers moving supplies through the icefall. |
| 4 | Nanga Parbat · 1937 | 16 | Camp IV · Rakhiot side | Large serac / ice avalanche buried camp | Seven expedition members and nine Sherpa porters died. |
| 6 | Manaslu · 1972 | 15 | Camp III · ~6,500 m | Large avalanche overwhelmed sleeping camp | Four Koreans, one Japanese and ten Sherpa staff were killed. |
| 7 | Manaslu · 2012 | 11 | High camps · ~6,700–7,300 m | Serac fall triggered slab avalanche | Himalayan Database seasonal history records 11 killed while climbers slept. |
| 8 | Broad Peak · 2026 | 10 | High on Broad Peak | Avalanche swept entire 10-person expedition | AP confirmed all ten climbers dead after the July 2026 event. |
| 9 | Everest · 1922 | 7 | Below North Col | Fresh-snow slab avalanche | Seven high-altitude porters became Everest’s first recorded climbing fatalities. |
| 9 | Dhaulagiri I · 1969 | 7 | East / southeast glacier approach | Collapsing ice cliff triggered ice avalanche | Seven members of the American expedition were killed; one man survived the edge of the slide. |
| 11 | Everest · 1970 | 6 | Khumbu Icefall | Serac / ice collapse | Six Sherpas carrying loads for the Japanese ski expedition were killed. |
| 11 | Everest · 1974 | 6 | West Ridge expedition | Avalanche | One French climber and five Sherpas died in the French attempt. |
| 11 | Annapurna I · 1991 | 6 | ~7,500 m | Avalanche swept Korean team and Sherpas | Two Korean climbers and four Sherpas died; two Sherpas survived the sweep. |
| 11 | Ama Dablam · 2006 | 6 | Camp III | Collapse of the Dablam serac sent avalanche debris through camp | Three European climbers and three Sherpas were killed at a site previously regarded as comparatively safe. |
Why the list stops at six deaths
Below this point, the number of historically documented incidents expands quickly and reporting becomes less consistent across eras and regions. The table is designed to benchmark the worst major events, not to replace a complete avalanche-accident database.
An Earthquake Turned Camp II Into the Deadliest Mountaineering Avalanche Site on Record
On July 13, an earthquake centered in Afghanistan dislodged séracs above Camp II. Forty-three of the 45 climbers in the main camp were killed. Two survived; a separate group of six British climbers had bivouacked away from the main concentration and escaped.
43 Deaths Came From Three Conditions Converging
The event was not simply “bad snow.” A rare seismic trigger acted on unstable hanging ice directly above a densely populated camp.
An earthquake
The epicenter was in Afghanistan, but shaking was sufficient to dislodge séracs on the mountain.
Seismic triggering removed the normal weather-only warning logic.Hanging ice
The release began with sérac collapse rather than a skier- or climber-triggered snow slab.
Icefall hazard can be difficult to forecast on human time scales.A crowded Camp II
Forty-five climbers were concentrated in the avalanche path.
The camp population turned one release into a mass-casualty event.
Everest’s Deadliest Avalanche Events Happened in Very Different Places
The 1922 North Col approach, the 1970 and 2014 Khumbu Icefall events, and the 2015 earthquake avalanche at Base Camp share the same mountain but not the same hazard geometry.
Everest 2015, Kang Guru 2005, Everest 2014 and Nanga Parbat 1937
These four events show almost the full range of catastrophic avalanche mechanisms: earthquake, powder avalanche, serac-triggered icefall and camp burial beneath hanging ice.
19 Base Camp deaths reported
The M7.8 Gorkha earthquake triggered an avalanche into expedition Base Camp. Global Summit Guide uses the Nepal Mountaineering Association’s 19-death Base Camp reporting anchor while acknowledging that narrower permit datasets differ.
Even Base Camp can become an impact zone under an exceptional regional trigger.18 killed in their tents
After prolonged snowfall, a huge powder avalanche swept a French expedition’s Base Camp into a gorge. Seven French members and 11 Nepalese employees died.
A “normal” base-camp site can still sit inside extreme runout.16 Nepali workers killed
A massive serac on Everest’s West Shoulder collapsed into the Khumbu Icefall while workers were carrying equipment toward Camps I and II.
The toll exposed how much hazard is transferred to workers who make repeated carries.16 buried at Camp IV
A giant ice avalanche from a sérac roughly 300 m above the Rakhiot-side camp buried seven expedition members and nine Sherpas.
The camp itself was the exposure.
A Base Camp Can Be Far Below the Summit and Still Be Inside the Avalanche System
The Kang Guru disaster is a reminder that “Base Camp” describes expedition function, not guaranteed terrain safety. The avalanche swept tents and people into a gorge after prolonged heavy snowfall.
Manaslu: 15 Killed in 1972, 11 in 2012
Manaslu is the only mountain in the upper portion of this ranking with two separate avalanche events killing more than ten people. The 1972 South Korean expedition lost 15 at Camp III. Forty years later, a serac fall triggered a slab avalanche through sleeping high camps and killed 11.
The episodes were separated by four decades, different expedition systems and very different traffic levels. Their shared lesson is narrower: high camp concentrates people in one place for hours inside terrain that can be reached by a large release.
Broad Peak 2026: Ten Climbers Swept Away
The newest major event on this page occurred in Pakistan’s Karakoram in late July 2026. The Associated Press reported that an avalanche swept a 10-person expedition on Broad Peak and subsequently confirmed all ten climbers dead.
Because this event is recent, details that go beyond the confirmed death toll, mountain and avalanche mechanism should be treated cautiously until formal accident reports and expedition records are complete.
Why recent incidents need a different evidence standard
Early reports can change as searches, recoveries and identification continue. This ranking uses the confirmed 10-death figure and avoids reconstructing trigger mechanics that are not yet firmly established.
Mass Casualties Usually Require More Than a Big Avalanche
A catastrophic release can pass through empty terrain and kill no one. The extreme tolls occur when physical hazard and concentrated human exposure overlap.
Camp concentration
Peak Lenin 1990, Kang Guru 2005, Nanga Parbat 1937, Manaslu 1972, Manaslu 2012 and Ama Dablam 2006 all involved camps.
Sleeping exposure can last eight or ten hours in exactly one place.Hanging ice
Seracs and ice cliffs appear repeatedly because their collapse can release huge mass with limited short-term predictability.
Route skill cannot stabilize the ice above you.Repeated worker passes
Everest’s Khumbu Icefall requires workers to move loads through the same hazard corridor many more times than most clients.
Exposure is cumulative, not just per crossing.Post-storm loading
Kang Guru 2005 and Manaslu 2012 followed major snow accumulation.
Camp placement and timing become more important as loading increases.Rare external triggers
Peak Lenin 1990 and Everest 2015 were triggered by earthquakes.
These events sit outside ordinary daily avalanche forecasting.Retreat can remain exposed
An avalanche problem does not end just because a summit attempt is abandoned.
Teams still have to cross the same slopes, icefalls and camps on the way down.
Before Modern Forecasts, Expedition Camps Were Still Placed Beneath Threatening Ice
The 1937 account records anxiety about a hanging glacier before a massive sérac failure buried Camp IV. The accident remains one of the clearest historical examples of high-camp exposure beneath unstable ice.
Why Sherpas, Porters and Expedition Workers Appear So Often in the Fatality Record
Historical climbing narratives frequently center the expedition leader or summit team. Avalanche statistics expose a different structure: the people carrying loads and maintaining camps can accumulate far more time inside objective-hazard corridors.
| Event | Worker / staff toll | Exposure pattern |
|---|---|---|
| Everest 1922 | 7 high-altitude porters | Supporting the third summit attempt below the North Col after fresh snowfall. |
| Nanga Parbat 1937 | 9 Sherpas | Sleeping at Camp IV with the expedition members beneath a sérac source. |
| Everest 1970 | 6 Sherpas | Carrying loads through the Khumbu Icefall for the Japanese ski expedition. |
| Manaslu 1972 | 10 Sherpa staff | Camp III occupancy during the avalanche. |
| Everest 2014 | 16 Nepali expedition workers | Early-morning load carrying through the Khumbu Icefall. |
| Kang Guru 2005 | 11 Nepalese employees | Base Camp tents during a powder avalanche. |
| Ama Dablam 2006 | 3 Sherpas | Camp III beneath the Dablam serac. |
“Same mountain” does not mean “same exposure.”
A client who crosses a hazard zone twice and a worker who crosses it a dozen times do not have the same cumulative exposure, even if each individual passage carries similar instantaneous risk.
Four Ways the Deadliest Climbing Avalanches Begin
Calling everything an “avalanche” can hide the most important distinction: what released the mass in the first place.
Loaded snowpack fails
Fresh snow, wind loading and weak layers can release a cohesive slab.
Everest 1922 and parts of Manaslu 2012 fit this family.Fast suspended snow cloud
Large dry avalanches can develop destructive air pressure and unpredictable lateral spread.
Kang Guru 2005 was described as a giant powder-snow avalanche.Hanging glacier fails
Blocks of glacier ice fall under gravity and can entrain snow and debris below.
Everest 2014, Nanga Parbat 1937 and Ama Dablam 2006 are key examples.Seismic shaking releases slope or ice
A distant or regional earthquake can destabilize hanging ice or snow on steep terrain.
Peak Lenin 1990 and Everest 2015 show why rare triggers defeat normal timing assumptions.Glacial source above route
A collapsing ice cliff can generate an ice avalanche through a climbing basin.
Dhaulagiri 1969 killed seven in this way.One release triggers another
Serac fall can load or trigger snow slopes, while avalanche air blast can destroy tents beyond the densest debris.
The most damaging events often involve more than one material phase.Why Yungay, K2 2008 and Everest 1996 Are Separate Questions
A useful roundup must say what it leaves out. Otherwise the ranking rewards whichever source uses the broadest possible definition.
| Event | Why people expect it here | Why it is not ranked | Where to read it |
|---|---|---|---|
| Huascarán / Yungay 1970 | Often called the deadliest avalanche in history; 18,000+ deaths in the USGS geological record. | Victims were overwhelmingly civilians in communities below the mountain, not a climbing expedition population; technically a rock-and-ice debris avalanche. | Huascarán 1970 Avalanche |
| K2 2008 | A serac collapse initiated the crisis near the Bottleneck. | The 11 deaths followed through mixed mechanisms including fixed-rope destruction, falls, stranding and exposure, so it is not a clean one-avalanche toll. | K2 disaster history |
| Everest 1996 | One of the best-known mountaineering disasters. | Primarily a storm, turnaround, exhaustion and exposure disaster—not an avalanche mass-casualty event. | Everest Disasters |
| Everest 2023 season | 18 deaths made it one of Everest’s deadliest seasons. | Those deaths came from multiple separate causes and incidents across a season. | Deadliest Season on Each 8000er |
By 1979, Avalanche Deaths Were Already Concentrated on the Biggest Himalayan Peaks
An American Alpine Journal analysis covering 1895–1979 counted 34 avalanche fatalities on Everest, 20 on Nanga Parbat, 17 each on Dhaulagiri I and Manaslu, and 12 on Annapurna I. Those are cumulative mountain totals over many events—not single-disaster rankings—but they show how long avalanche exposure has shaped high-altitude mountaineering.
Do not compare cumulative mountain totals with single-event rankings.
“Everest had 34 avalanche deaths by 1979” and “Peak Lenin 1990 killed 43 in one avalanche” answer different questions. This page keeps those denominators separate.
Six Planning Lessons Without Pretending Avalanches Are Fully Controllable
These disasters do not justify blaming victims with hindsight. They do reveal recurring exposure patterns modern teams can ask about before and during an expedition.
Where is every camp relative to runout?
Do not stop at “this is the normal campsite.” Ask what hangs above it and what the largest plausible release can reach.
Kang Guru and Ama Dablam show why normal does not mean invulnerable.How many times must staff cross the hazard?
Count carries, rotations and load movements—not just the client itinerary.
Repeated exposure changes the risk distribution.What changes after major snowfall?
Camp location, travel timing and route choice may need to change rather than simply waiting a fixed number of hours.
Snow loading is terrain-specific.What hazards are not forecastable?
Serac collapse and earthquake triggering have a large random component.
Reduce time under them rather than pretending to predict the exact release.What is the rescue reality?
A buried high camp may have dozens of rescuers nearby—or no practical rescue capacity at all.
Beacon, shovel and probe availability matters only if partners can use them in time.What would make the team move camp?
Define triggers before the storm, crowding or schedule pressure arrives.
Pre-commitment reduces decision inertia.Direct Answers About the Worst Climbing Avalanches
The answers use the same expedition-population counting rule as the ranking.
What was the deadliest avalanche in mountaineering history?
The July 13, 1990 Peak Lenin avalanche is the deadliest well-documented single event in this mountaineering ranking. An earthquake dislodged séracs that swept Camp II and killed 43 of the 45 climbers there.
What was the deadliest avalanche on Mount Everest?
Using the Nepal Mountaineering Association Base Camp reporting anchor, the 2015 earthquake-triggered Everest avalanche killed 19 people at expedition Base Camp. Some climbing databases use narrower inclusion rules and therefore show different totals.
Why is the 2014 Everest avalanche ranked at 16 deaths?
A serac on Everest’s West Shoulder collapsed into the Khumbu Icefall on April 18, 2014, killing 16 Nepali expedition workers who were moving equipment through the route.
How many people died in the 2005 Kang Guru avalanche?
Eighteen people died: all seven members of the French expedition and 11 Nepalese expedition employees at Base Camp.
How many died in the 1937 Nanga Parbat avalanche?
Sixteen people died when an ice avalanche buried Camp IV: seven expedition members and nine Sherpa porters.
How many people died in the 1972 Manaslu avalanche?
Fifteen died at Camp III: four Koreans, one Japanese and ten Sherpa staff. Three people at the camp survived being swept by repeated avalanches.
How many people died in the 2012 Manaslu avalanche?
The Himalayan Database seasonal history records 11 deaths after a serac fall triggered a slab avalanche through high camps on September 23, 2012.
What happened on Broad Peak in 2026?
In late July 2026, an avalanche swept a 10-person climbing expedition on Broad Peak in Pakistan. The Associated Press subsequently reported that all ten were confirmed dead.
Why is the 1970 Yungay disaster not number one on this list?
Yungay was a civilian catastrophe below Huascarán rather than a mountaineering-expedition accident. It also involved a massive rock-and-ice debris avalanche rather than a normal climbing snow avalanche. It is covered separately on Global Summit Guide.
Was K2 2008 an avalanche disaster?
A serac collapse was central to the K2 2008 tragedy, but the 11 deaths occurred through mixed mechanisms including fixed-rope destruction, falls, stranding and exposure. This page therefore does not rank it as a clean one-avalanche toll.
Why are camps so common in the deadliest avalanche list?
Camps concentrate many people in one fixed location for hours. If the site lies inside a large runout zone, one release can affect an entire expedition population at once.
Are serac avalanches predictable?
Serac collapse timing is difficult to forecast precisely. Teams can often identify threatened terrain and reduce time beneath it, but they generally cannot predict the exact hour a large ice block will fail.
The Ranking Uses Event-Level Sources, Not One Universal Database
Historical expedition records differ in inclusion rules, spelling and whether workers were counted as members or hired staff. Each major event is therefore checked against the strongest event-level source available.
The Deadliest Avalanche Is Usually the One That Reaches the Most People.
The ranking can make the disasters look like a contest between mountains. They are better understood as intersections of hazard and exposure. Peak Lenin’s earthquake, Everest’s séracs, Kang Guru’s powder avalanche and Manaslu’s high-camp releases were physically different events. What made them mass-casualty disasters was the presence of many people in one runout zone at the same time. Modern avalanche planning cannot remove every serac, earthquake or storm—but it can keep asking the question history repeats: how many people, for how long, are we placing beneath what can fall?
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