Everest's Deadliest Moment Isn't the Summit — It's the Walk Back Down

Most people imagine the deadliest moment on Everest is the final push to the 8,849-metre summit. It isn't. A new mortality study covering every recorded expedition from 1921 to 2024 found that more than three-quarters of all climber deaths on the mountain happened on the way back down — not going up.

The research, titled 'Updates to Mortality on Mount Everest: 1921–2024' by Ryan E. Dodge and colleagues, published in The Journal of Physiology in 2026, is the most complete look yet at why people die on the world's highest mountain — and when. The team tracked 192 deaths in the 1921–2006 period against 117 in 2007–2024, and broke the more recent era down by exactly which stage of the climb proved fatal.

The improvement over a century is real — better weather forecasting, supplemental oxygen systems, fixed ropes maintained by the Icefall Doctors, and satellite phones have all cut the odds sharply. But the descent gap hasn't closed at the same pace. A climber who has just spent 8–12 hours fighting through the death zone above 8,000 metres is dehydrated, hypoxic and running on fumes exactly when the terrain is most unforgiving: icy, exposed, and often hit by afternoon weather that wasn't there at dawn.

Why the gap between clients and Sherpa guides? Sherpas descend from the summit region far more often in a season, know exactly where the safe anchor points and shortcuts are, and are acclimatised to a degree most paying climbers on a single expedition never reach. It isn't luck — it's repetition, local knowledge and pacing, the same three things that separate a safe descent from a dangerous one on any Himalayan peak, not just Everest.

What this means for trekkers and climbers

Practically, that means budgeting real rest days for acclimatisation before any summit push, drinking more water than feels necessary once you're above 5,000 metres, and climbing or trekking with guides who know the descent route as well as the ascent — which is exactly why NMA-certified guiding matters on a peak climb, not just a walking trek. We've written before about how dangerous the Everest Base Camp trek really is, and the same rule holds there: most trouble starts after the highlight of the day, not before it.

If you're weighing a guided peak climb in the Khumbu, this is the number worth remembering: it isn't the summit that decides how your trip ends. It's the walk back down.

Source: Medical Xpress, reporting on 'Updates to Mortality on Mount Everest: 1921–2024' (Dodge et al., The Journal of Physiology, 2026).

Cover photo: Prabin Sunar via Pexels (Pexels License).