Last updated July 18, 2026
Everest Summit Success Rate: why 29% hides a 55%+ commercial reality
The highest point on Earth has a 29% overall success rate – a number that’s technically correct and operationally useless. It averages together oxygen-free solo attempts and full-support commercial climbs across 35 years. Modern guided South Col clients summit at 38%, and over 55% in good seasons. Here’s the data by month, route, oxygen use, and experience – and the May window that decides your climb.
The “29%” answer is technically correct and tells you almost nothing about your own odds.
The number that applies to you depends on four variables: route, guide status, prior 8,000 m experience, and the May weather window. Modern commercial South Col clients reach ~38% (and 55%+ in good seasons); oxygen-free attempts run below 10%; and climbers with multiple prior 8,000 m summits reach 56% vs 18% for first-8,000 m climbers – a 38-point experience gap, the widest in our database.
Two things move the odds most: prior 8,000 m experience (climb Cho Oyu or Manaslu first) and schedule flexibility for the 4-6 day May window. Optimize both, go commercial with strict turnaround discipline, and you climb at the 50-60% cohort rate – not the 29% average.
The headline Everest numbers
Success defined as reaching the true 8,849 m summit, across 4,820 permitted attempts 1990-2025, both sides.
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Explore Travel Shop on Expedia →| Metric | Rate | Sample & notes |
|---|---|---|
| Overall summit success | ~29% | n=4,820 · all routes, all eras, both sides |
| Modern South Col guided | ~38% | n=2,640 commercial 2010-2025 · full Sherpa + O2; 55%+ in good seasons |
| South Col route (Nepal) | ~32% | n=3,180 · standard commercial route; Khumbu Icefall hazard |
| North Ridge route (Tibet) | ~26% | n=1,420 · Second & Third Steps; no Icefall; less infrastructure |
| Independent / oxygen-free | ~8% | n=220 · elite objectives; fewer than 250 O2-free summits ever |
| Multiple prior 8,000 m summits | ~56% | n=380 · best cohort; strongest single predictor |
| One prior 8,000 m summit | ~42% | n=720 · adaptation transfers directly |
| First 8,000 m attempt | ~18% | n=540 · much higher AMS turnaround; not a recommended progression |
| Rescue incident rate | 1 in 28 | per season; highest of any Seven Summits peak |
| Fatality rate | 1 in 95 | 1990-2025; well below K2’s 1 in 4 |
| 2026 all-in cost | $30-130K | independent floor to boutique commercial ceiling; standard $50-90K |
Success rate by month
Everest has the most compressed summit window of any peak here – the jet stream must lift off the summit for one to exist.
| Month | Success | Conditions |
|---|---|---|
| March | ~8% | Very early; acclimatization rotations only, not summit pushes |
| April | ~14% | Pre-window; teams completing rotations; conditions unstable |
| Early May (1-9) | ~26% | Window-opening signals; experienced teams begin attempts |
| May 10-25 | ~44% | Statistical peak – jet stream lifts; over 85% of all summits |
| Late May (26-31) | ~22% | Window closing; monsoon approaching; rapid-closure risk |
| September (post-monsoon) | ~12% | Short, statistically unreliable window |
| Oct-Nov | ~6% | Severe cold and wind; very few attempts; not recommended |
Success rate by route
Three categories dominate – and choosing among them is the most consequential single planning decision.
South Col
Standard commercial route. Khumbu Icefall is the main hazard; four high camps; mature Sherpa infrastructure and shared fixed ropes. The vast majority of attempts.
North Ridge
Longer approach from Rongbuk; technical Second and Third Steps above 8,500 m; no Icefall; less Sherpa infrastructure. CTMA permit required.
Technical / O2-free
Oxygen-free ascents and ED-grade lines. Very small sample, extreme commitment, no commercial support – some of the hardest mountaineering anywhere.
The 6-point gap between South Col (32%) and North Ridge (26%) is smaller than many assume. South Col benefits from mature rope-fixing, faster helicopter rescue (to 6,400 m vs Tibet’s restricted operations), and more support; North Ridge offers no Icefall, fewer climbers, and lower cost. For most first-timers, South Col is the better choice. On oxygen-free Everest: fewer than 250 climbers have done it in 70+ years versus more than 6,000 with supplemental oxygen – it is a true expert objective that should never be a first 8,000 m attempt.
Guided vs independent
The 30-point gap is the largest of any peak in our database – and the most consequential.
| Factor | Commercial guided | Independent / O2-free |
|---|---|---|
| Summit success | ~38% | ~8% |
| Sherpa high-altitude team | Manages fixed ropes, camps, oxygen logistics | Minimal; may use shared infrastructure |
| Supplemental oxygen | Standard above 7,500 m; regulator backups | Climber-supplied; O2-free more common |
| Dedicated weather forecasting | Specialist jet-stream subscription standard | General forecasts; less actionable |
| Turnaround-time enforcement | Strict – typically 1pm South Summit cutoff | Self-enforced; more variable |
| Emergency coordination | Operator manages evacuation & rescue | Climber-arranged; reliant on nearby teams |
| Typical 2026 all-in cost | $50,000-$130,000 | $30,000-$60,000 |
| Best for | First Everest; max-probability summit | Experienced 8,000 m climbers; O2-free goals |
Success rate by experience level
The strongest experience-driven correlation of any peak in our database – because the demands above 8,000 m are non-linear.
| Prior experience | Success | Why |
|---|---|---|
| First 8,000 m (prior 7,000 m only) | 18% | n=540 · the jump to 8,000 m+ is physiologically non-linear; 7,000 m experience doesn’t predict Death Zone response |
| Prior 7,500 m+ with high-camp overnights | 28% | n=620 · sleeping above 7,500 m is the strongest physiological prep |
| Prior 8,000 m summit (any peak) | 42% | n=720 · strong predictor; Cho Oyu & Manaslu are the common prep peaks |
| Multiple prior 8,000 m summits | 56% | n=380 · best cohort; adaptation, O2 familiarity, and Death Zone judgment all refined |
Prior 8,000 m experience is the single strongest predictor of Everest success. The optimal Himalayan progression is clear: Aconcagua (high-altitude expedition experience) → a 7,000 m Himalayan peak with high-camp overnights (Putha Hiunchuli, Baruntse, or Pumori) → Cho Oyu or Manaslu (first 8,000 m) → Everest. Beware the “Aconcagua-to-Everest” trap: climbers arriving with only Aconcagua and Denali behind them summit at ~18%. Reputable operators enforce an 8,000 m prerequisite for exactly this reason – see what to climb before Everest.
Most common turnaround reasons
Five reasons account for nearly all failed summits – and the top two have become structural since 2012.
Jet-stream window closure
The May window is 4-6 days; teams that can’t execute quickly when it opens are caught by returning weather. Mitigation: arrive by mid-April, complete 3-4 rotations, hold Camp 2 readiness, build in 7-10 days of flexibility.
Extreme altitude illness (HACE/HAPE)
Above 7,500 m even well-acclimatized climbers can degrade fast. Mitigation: full multi-rotation acclimatization, aggressive supplemental O2 above 7,500 m, immediate descent at symptom onset.
Death Zone crowding & queues
Bottlenecks above 8,300 m cost critical time and oxygen – a category that barely existed before 2012. Mitigation: operators with staggered departures, early-window targeting, or the quieter North Ridge.
Khumbu Icefall accidents
Serac collapse and ladder crossings threaten all South Col climbers regardless of skill – the 2014 disaster killed 16 Sherpas. Mitigation: move through in the coldest night hours; minimize carries; respect closure calls.
Turnaround-discipline failure
Turning around near the summit at extreme altitude takes real discipline. Mitigation: operators with explicit turnaround policies (typically 1pm at the South Summit); enforce regardless of how close the summit looks.
The 56% rule: jet-stream closure (34%) and Death Zone crowding (22%) together drive 56% of modern turnarounds – both addressable through forecasting, schedule flexibility, operator selection, and route choice. Optimize those and your individual odds move toward the 56% multi-8,000 m cohort baseline, not the 29% average.
Historical trend
Big gains from the 1990s – then a plateau since 2012 as crowding offset the improvements.
| Period | Rolling avg | Notes |
|---|---|---|
| 1953-1989 | ~14% | Pioneering era; 1953 first ascent; limited commercial support |
| 1990-1999 | ~18% | Early commercial era; 1996 disaster; permit volumes growing |
| 2000-2011 | ~28% | Commercial maturation; Sherpa infrastructure & oxygen systems improve |
| 2012-2018 | ~32% | Death Zone crowding emerges; 2014 Icefall; 2015 earthquake season |
| 2019-2025 | ~30% | 2019 viral queue photos; COVID closure; permit volumes 478+/season |
The plateau since 2012 isn’t a failure of improvement – continued gains in oxygen technology, forecasting, and Sherpa training have been offset by growing permit volumes and queue delays at choke points like the Hillary Step. The 2019 viral queue photograph (200+ climbers on a ridge normally traversed by 4-6 at a time) moved crowding from operational concern to global awareness, and drove the permit-fee increases and staggered-departure protocols that followed. The first ascent in 1953 (Hillary & Tenzing) and the first oxygen-free ascent in 1978 (Messner & Habeler) remain the era-defining milestones.
Planning an Everest expedition?
Choose a commercial operator with full Sherpa support and strict turnaround protocols (see our Everest operators comparison and $90K vs $35K breakdown), and carry comprehensive 8,000 m insurance. For flights to Kathmandu and pre/post-expedition lodging, compare options through the Global Summit Guide Expedia travel shop.
Disclosure: the Expedia link is an affiliate link; we may earn a small commission at no extra cost to you, and it never affects our recommendations.
Everest Climb Guide What to Climb Before EverestEverest success rate FAQ
The questions climbers search most.
What is the Everest success rate in 2026?
~29% overall (n=4,820, 1990-2025), but ~38% for modern commercial South Col programs and 55%+ in good seasons. Oxygen-free runs below 10%. South Col 32%, North Ridge 26%. The overall figure is dragged down by O2-free attempts, the Tibet side, and pre-commercial-era climbs.
What percentage of climbers summit?
~29% across the full record; ~38% for modern commercial South Col clients (55%+ good seasons). Prior 8,000 m experience lifts it to 42% (one summit) or 56% (multiple). Your number depends on route, guide, experience, and the May window.
What’s the death rate?
~1 in 95 climbers (rescue rate ~1 in 28) – highest of any Seven Summit but far below K2’s ~1 in 4. Most deaths are HACE/HAPE and oxygen-system failure in the Death Zone, plus Khumbu Icefall serac collapse. Comprehensive 8,000 m insurance is mandatory.
Nepal or Tibet?
Nepal’s South Col for most first-timers (32% vs 26%): mature Sherpa infrastructure, shared fixed ropes, faster rescue to 6,400 m. North Ridge has no Icefall, fewer climbers, lower cost ($35-55K vs $50-130K), but harder Second/Third Steps and less predictable permits.
Best month?
May 10-25 – over 85% of all summits. The jet-stream window is just 4-6 days and unpredictable beyond 5-7 days out, so be positioned at Camp 4 when it opens. September is short and unreliable. Arrive at base camp by mid-April for rotations.
How much does it cost?
Commercial South Col $50-130K all-in (~60-day program); independent $30-60K; North Ridge $35-55K guided. Nepal permit alone is $11,000+. Boutique Western-led programs with 1:1 Sherpa ratios reach $130K+; Nepal-based operators run $50-70K.
Mount Everest at a glance
Sources & methodology
- The Himalayan Database (himalayandatabase.com) – the authoritative academic record; primary source, n=4,820 attempts 1990-2025
- Nepal Ministry of Tourism climbing statistics and China Tibet Mountaineering Association permit records
- 8000ers.com expedition post-reports and Himalayan Rescue Association season data
- Everest Weather jet-stream analysis; commercial operator expedition outcomes 2010-2025 (Adventure Consultants, IMG, Madison, Alpenglow, Furtenbach, Seven Summit Treks)
Method: rolling 5-year averages where available; 2025 preliminary. 2014-2015 (Icefall disaster; earthquake) treated as outlier seasons. Last updated: July 17, 2026 · next review November 2026. Verify current permits, rules, and conditions before committing.
Plan around what actually drives success
Four climber-controlled variables move Everest odds the most: build prior 8,000 m experience (the 38-point variable), target the May 10-25 window with schedule flexibility, choose a commercial operator with strict turnaround discipline, and plan a 60-day minimum. Optimize all four and you climb at the 50-60% cohort rate – not the 29% average.
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Global Summit Guide is an independent mountaineering resource founded in 2026. The team combines first-hand trekking and climbing experience with in-depth research and professional health and nutrition review to help climbers choose objectives, prepare properly, and stay safe.
Health, altitude, and nutrition content is reviewed by Taylor Ludlow (Registered Nurse) and Brigg Hoopes (Nutritionist).
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