Climbing K2

Is climbing K2 safe?

No. K2 is one of the two or three deadliest mountains people climb, and it is more dangerous than Everest on every measure we can find. Climbing magazine counted about 96 deaths against roughly 800 summits by early 2025, or 12 deaths for every 100 people who reached the top. For most of its history the ratio was worse than one in five.

Guided teams have changed the numbers. Until 2021 only 377 people had ever stood on the summit. In 2022, 200 did so in a single season, 145 of them within 24 hours, and two climbers died. In 2023 about 112 people summited and one died. That is roughly 1 death per 100 summits.

What does that mean per climber?

K2 is in Pakistan, so the Himalayan Database, which gives Everest its precise rates, does not cover it. No one publishes how many people set out each season, only how many summited and who died. A rough estimate is still possible. Not everyone who tries gets to the top: in 2026 about 50 people attempted K2 and nobody summited. If roughly half to two-thirds of climbers summit in a good year, the deaths in 2022–2025 work out to somewhere around 0.5% to 1% of everyone who set out, or roughly 5,000 to 10,000 micromortsMicromortA one-in-a-million chance of death. It lets you compare the risk of very different activities on one scale.More in the glossary per expedition.

That is the same order as an Everest expedition (about 7,000 micromorts in 2007–2024), with much less certainty. Over the whole history of the mountain, the risk per summit is about 120,000 micromorts, a figure that reflects the decades before fixed ropes and big teams.

Why K2 kills climbers

The standard Abruzzi Spur route is steep almost all the way up. More than three-quarters of ascents use it. The crux is the Bottleneck, a steep couloir about 400 metres below the summit, directly under a hanging wall of ice. Climbers have to pass through it on the way up and again, exhausted, on the way down.

On 1 August 2008, part of that ice cliff collapsed while climbers were descending from the summit. The ice killed climbers outright and cut the fixed ropes, leaving others stranded high on the mountain overnight. Further ice fall and attempts to reach the stranded climbers added to the toll. Eleven people died, from Serbia, Pakistan, Norway, South Korea, Nepal, Ireland and France.

Lower down, rockfall is the growing problem. Alan Arnette described 2025 as a "rocky season": rockfall killed at least two climbers, including a woman struck between Camp 1 and Advanced Base Camp after she had summited, and an avalanche hit four climbers below Camp 1. In 2026, rockfall, high winds and heavy snow stopped every summit attempt. The last team high on K2 abandoned its bid on 30 July to help search for survivors of an avalanche on nearby Broad Peak that killed ten climbers, among them Nirmal Purja.

K2 also sits about eight degrees further north than Everest. A 2021 study found that its summer summit air is slightly less thin than Everest's (347 against 333 hectopascals), but in winter K2's summit averages about −45 °C, colder than Everest.

The guided era and its costs

Fixed ropes from base camp to the summit, bottled oxygen and Nepali and Pakistani guides have made K2 reachable for wealthy clients who would not have tried it 20 years ago. The cost of that shift fell partly on high-altitude porters. In July 2023 Muhammad Hassan, a Pakistani porter, collapsed and died at the traverse above the Bottleneck as dozens of climbers passed him on a summit day. A Gilgit-Baltistan government inquiry found he had been poorly equipped, inexperienced and uninsured, and banned his employer, Lela Peak Expeditions, from running expeditions in the region for two years.

Who should be careful

Everyone, but especially:

• Climbers without several 8,000-metre peaks behind them. K2 is not a first or second 8,000er. Most operators ask for previous ascents of peaks such as Everest, Manaslu or Broad Peak.
• Anyone relying on a guide to make their decisions. A turnaround on K2 often has to be made at the Bottleneck, late in the day, by the client as well as the guide.
• Teams going in a heavy snow year. Arnette reported that some climbers on Broad Peak in 2026 went home over the snow conditions days before the avalanche.

How to reduce the risk

1. Climb other 8,000-metre peaks first and be honest about how you coped high up.
2. Pick an operator that pays, equips and insures its porters and guides properly, and ask how many oxygen bottles and Sherpas each client gets.
3. Agree a hard turnaround time for the Bottleneck before summit day.
4. Do not move through the Bottleneck or rockfall zones in warm afternoons, when ice and rock release most.
5. Leave if the snowpack worries you. Walking out is always an option.
6. Buy rescue insurance that covers helicopter evacuation in Pakistan, and confirm the height limit in writing.

How we scored it

Fatality risk (5) and rescue and environment (6) sit at the very bottom of our scale. Injury risk (20) reflects frostbite, altitude illness and rockfall. Controllability (30) gives some credit to oxygen, ropes and turnaround rules, but ice cliffs and rockfall strike regardless. K2 scores just below Everest, and far below general mountaineering.