Last updated July 14, 2026
Summit Success Rates by Peak 2026: What Actually Drives Whether You Reach the Top
Most guidebooks quote a single number – “Aconcagua has a 40% success rate” – with no context. The real answer depends on when you go, which route you take, whether you’re guided, and what altitude experience you bring. Here’s the disaggregated data for 24 major peaks.
Experience match beats altitude
Across 24 peaks, success rates span almost 7x, from Vinson’s ~95% to K2’s ~14% – and the gap tracks the match between the climber’s experience and the mountain’s demands far more than raw altitude. Four variables under your control (timing, route, guide status, prior altitude) typically double individual summit odds when you get them right.
On this page
The phrase “summit success rate” sounds like a single number, but a peak’s published rate is a weighted average of many subcategories: guided vs independent, Normal Route vs technical, January vs February, first-time altitude climbers vs seasoned veterans. When those subcategories disaggregate, the apparent precision collapses. A 39% rate on Aconcagua means very different things depending on which subcategory describes you. This page gives you both the master ranking and the disaggregated view.
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Highest success rate to lowest. The coloured left borders match the four tiers: green 60%+, blue 40-60%, orange 20-40%, red under 20%.
| Peak | Elevation | Country | Success rate | Notes |
|---|---|---|---|---|
| Vinson Massif | 4,892m | Antarctica | ~95% | Self-selected experienced base, ALE logistics, short technical climb once you arrive |
| Island Peak | 6,189m | Nepal | ~80% | The Nepal trekking-peak gateway; heavy commercial infrastructure |
| Mount Elbrus | 5,642m | Russia | ~72% | Cable car to 3,800m, snowcat option, established operator chain |
| Mount Kilimanjaro | 5,895m | Tanzania | ~65% | KPAP-member operators; 8-day Lemosho route runs ~85% |
| Mera Peak | 6,476m | Nepal | ~65% | Highest trekking peak in Nepal; standard 18-day itinerary |
| Carstensz Pyramid | 4,884m | Indonesia | ~60% | Helicopter approach standard in 2026; technical rock climbing |
| Mont Blanc | 4,808m | France/Italy | ~58% | IFMGA-guided cohort; Goûter Route standard; weather-dependent |
| Mount Rainier | 4,392m | Washington, USA | ~54% | NPS concessionaire system; Disappointment Cleaver standard |
| Denali | 6,190m | Alaska, USA | ~51% | West Buttress; cold-weather glacier expedition; 22-day standard |
| Pico de Orizaba | 5,636m | Mexico | ~48% | Glaciated stratovolcano; weather and route conditions variable |
| Mount Shasta | 4,322m | California, USA | ~47% | Avalanche Gulch standard; high seasonal weather variance |
| Chimborazo | 6,263m | Ecuador | ~45% | Farthest point from Earth’s centre; ice and weather variable |
| Aconcagua | 6,961m | Argentina | ~39% | Normal Route 47%, guided 51%, independent 29%; Viento Blanco a major factor |
| Cho Oyu | 8,188m | Tibet | ~35% | Lowest-fatality 8000er; Chinese permitting intermittent |
| Manaslu | 8,163m | Nepal | ~33% | Cho Oyu substitute; autumn crowding; avalanche-exposed |
| Lhotse | 8,516m | Nepal/Tibet | ~32% | Often paired with Everest; shares the lower route |
| Mount Everest | 8,849m | Nepal/Tibet | ~29% | Heavily commercial; premium ops run 65%+; cohort heterogeneous |
| Matterhorn | 4,478m | Switzerland/Italy | ~28% | Hörnli Ridge standard; technical difficulty drives the lower rate |
| Dhaulagiri I | 8,167m | Nepal | ~23% | Tier II 8000er; Northeast Ridge standard |
| Makalu | 8,485m | Nepal/Tibet | ~22% | Tier III 8000er; Northwest Ridge sustained steep |
| Kangchenjunga | 8,586m | Nepal/India | ~20% | 3rd highest; remote, long approach, weather-exposed |
| Annapurna I | 8,091m | Nepal | ~17% | Deadliest 8000er; avalanche-driven; Tier I Killer Peak |
| Nanga Parbat | 8,126m | Pakistan | ~16% | Tier I Killer Peak; avalanche and security risks |
| K2 | 8,611m | Pakistan/China | ~14% | Lowest commercially-attempted success rate; Bottleneck serac risk |
The four drivers of summit success
Four variables explain most of the gap between climbers who summit and climbers who don’t. All four are under your control.
The right month and weather window
Every major peak has a narrow window of high-success months and a wider window of low-success or unclimbable ones. On Aconcagua, the gap between January and February is roughly 7 points. On Everest, mid-May summits show meaningfully higher success than early or late May. On Denali, June 1-20 is optimal – earlier means colder, more weather-hold days; later means soft snow and opening crevasses. For Kilimanjaro and Mera Peak, the right months are January-February and June-October, between the monsoons.
The Normal Route premium
On every major peak, the Normal Route shows the highest success rate by a clear margin, sometimes dramatically. On Aconcagua, the Normal Route runs 47% while the South Face Messner Route runs 18%. On Everest, the South Col and North Col routes are within 5 points of each other, while the West Ridge and other technical lines run 5-10%. On Denali, the West Buttress (51%) is far higher than Cassin Ridge (sub-30%). The premium reflects both lower technical demands at the limit of fatigue and altitude, and the fixed ropes, rescue access, and forecasting that build up around the most-climbed line.
Guided vs independent
Guided climbers summit at meaningfully higher rates, typically 15-25 points on major peaks. Aconcagua guided success runs 51% vs 29% for independents; Kilimanjaro guided KPAP-member operators run 65-85% while independent self-organised treks drop to roughly 30-45%; the Mont Blanc gap is among the largest, with IFMGA-guided climbers near 65% and independent first-timers closer to 35%. Guides enforce acclimatisation schedules, make real-time weather and turnaround calls, and carry rescue coordination. Independent climbers who follow the same discipline show outcomes much closer to guided climbers – the gap exists mostly because most independents do not enforce it. For operator detail, see our mountaineering operators hub.
The prior-altitude effect
Once route and timing are controlled, experience is the strongest predictor of individual success. On Aconcagua’s Normal Route, first-time high-altitude climbers (no prior 5,000m+) succeed at 24%; climbers with a prior 5,000-6,000m summit at 38%; climbers with a prior 6,000m+ summit at 52%; and repeated high-altitude climbers with multiple 6,500m+ peaks at 61% – more than 2.5x the rate of novices on the same mountain. Altitude tolerance is not predicted by sea-level fitness: even elite endurance athletes can develop AMS, HAPE, or HACE at altitudes they haven’t visited. Prior exposure gives you and your guide a known acclimatisation profile to plan around.
High success tier · 60%+
Peaks where a well-prepared, properly-timed, competently-guided climber can reasonably expect to summit. Most dropouts come from weather, undertraining, or poor acclimatisation rather than the peak being beyond reach.
Vinson Massif: the highest success rate
Vinson has the highest success rate of any major commercial peak, largely from climber self-selection: only experienced, well-funded climbers reach it at all, given the $48,000-$58,000 cost and ALE flight logistics. Once you’re at Union Glacier the climb is technically straightforward, and the dominant cause of failure is a multi-day weather hold extending the trip past a climber’s available window.
Island Peak: the Nepal trekking-peak gateway
The most-summited 6,000m peak in Nepal and the standard introduction to Himalayan glacier and fixed-rope climbing. Rates run 75-85% on the 18-day expedition that combines the EBC trek with a summit attempt. The short technical headwall is the most common turnaround point, and it makes an excellent test peak for Everest aspirants.
Mount Elbrus: highest success of the Seven Summits
Elbrus has the highest success rate of any Seven Summit peak, reflecting the cable car that skips the lower 1,800m, snowcat options that compress summit-day timing, and an established Russian guiding chain. The dominant cause of failure is sudden Caucasus weather rather than altitude. Post-2022 sanctions have complicated Western access, but on-mountain rates remain consistent.
Mount Kilimanjaro: the big-volume success story
Kilimanjaro’s 65% headline hides one of the largest within-mountain spreads in commercial climbing: the 8-day Lemosho route runs about 85% while the 5-day Marangu route runs about 30%. KPAP-member operators consistently outperform non-KPAP ones, and the single biggest predictor is route days – more days means better acclimatisation. See our companion why Kilimanjaro climbers fail investigation.
Mera Peak: highest Nepalese trekking peak
The highest Nepalese trekking peak at 6,476m and a popular Everest precursor, running 60-70% on the standard 18-day expedition. The climb combines a long approach trek with a glacier summit day and moderate fixed-rope sections. Common turnaround reasons are altitude illness and weather, with the long pre-dawn summit-day start a critical timing point.
Carstensz Pyramid: the helicopter approach
Carstensz combines short technical climbing (Class 4-5 rock with fixed ropes), a helicopter approach (the standard option since 2026), and a self-selected experienced client base. Climbers who reach base camp summit at about 75%; the lower 60% headline folds in expeditions cancelled by Indonesian permit issues or weather that blocks the helicopter approach. See our Carstensz operators guide.
Mid tier · 40–60%
Peaks where outcomes depend heavily on guide choice, timing, and prior experience. This is where the four-drivers framework moves the needle most: a fit, acclimatised, guided climber on the standard route in the right month can run 65-75%, while an undertrained, time-pressured independent may run 20-30%.
Mont Blanc: the alpine classic
Mont Blanc’s 58% headline disguises a wide spread by guide status: IFMGA-guided climbers succeed at 65-70% while independent first-time alpinists run closer to 35-40%. The dominant failure modes are weather windows and rockfall – Mont Blanc has the most variable summit-day weather of any major Alpine peak, and Grand Couloir rockfall has forced closures and increasingly early starts.
Mount Rainier: the American mountaineering school
The standard American mountaineering school peak. Success on the Disappointment Cleaver route runs 50-60%, with the four-day RMI program near 55%. Turnaround reasons are consistent: weather and route conditions drive about 40%, altitude illness or exhaustion about 35%, and fitness limits about 25%.
Denali: the cold-weather glacier expedition
Denali’s 51% reflects unique cold-weather demands. The West Buttress is the dominant guided line; the technical routes (Cassin Ridge, Messner Couloir, West Rib) run at fractional rates. The main failure modes are weather hold-days that exhaust the time budget and altitude illness at high camp. A 1:2 guide ratio (vs the 1:3 standard) lifts odds 10-15 points.
Pico de Orizaba: highest peak in Mexico
Mexico’s highest peak and the standard introduction to glaciated climbing for North Americans, running 45-55% from Piedra Grande. Failure modes are high summit-cone winds and abrupt elevation gain – climbers go from Mexico City to 5,636m in 3-5 days. It’s the clearest illustration of the prior-altitude effect: climbers with prior 5,000m+ experience succeed at roughly 65%.
Mount Shasta: California’s iconic volcano
The largest stratovolcano in the Cascade Range, running 40-55% on the standard Avalanche Gulch route with strong seasonal variation. Rates are highest in May-June when snow supports a cramponed ascent; late-season climbs (July-August) involve more scrambling and rockfall, and rates drop accordingly.
Chimborazo: the bulge of the Earth
Technically the point on Earth’s surface farthest from its centre, thanks to the equatorial bulge. Rates run 40-50% with wide variability by ice and weather. Climbers typically pair it with Cotopaxi (5,897m) as an Ecuadorian acclimatisation progression; the 45% headline reflects frequent weather closures and the demands of the upper summit ridge.
Aconcagua: the high-altitude hike
One of the most-studied figures in commercial mountaineering. The subcategory breakdown is dramatic: Normal Route 47%, guided 51%, independent 29%, with prior altitude adding another 10-20 points. Failure modes: altitude illness drives 38% of turnarounds, Viento Blanco wind events 27%, and exhaustion or insufficient fitness 18%. The 5-year rolling rate has slipped from 46% (2005-2009) to 38% (2020-2024).
Lower success tier · 20–40%
The 8000-metre peaks and the most technical alpine peaks. Here the spread is dominated by experience: the question is whether a climber has the prior 8000m or technical-alpine background required, not whether the operator is good enough.
Cho Oyu: the most accessible 8000er
The highest success rate of any 8000er, reflecting its “first 8000er” status – most climbers arrive with prior 6,000m+ experience and proper guidance. Its 1.3% fatality rate is the lowest of the 14 eight-thousanders. The 35% headline folds in seasons disrupted by Chinese permit closures; in open seasons, operator-reported rates run 50-65%.
Manaslu: the Cho Oyu substitute
The standard “first 8000er” alternative when Cho Oyu is closed, running 30-50% depending on weather and snow. Autumn 2022 and 2024 saw rates near 90% for premium operators in optimal conditions. The main failure modes are avalanches (Manaslu is the most avalanche-exposed 8000er), high-altitude weather windows, and base-camp overcrowding when Cho Oyu is shut.
Lhotse: the 4th-highest peak on Earth
Lhotse shares its lower route with Everest – climbers cross the Khumbu Icefall and Western Cwm to Camp 3, then split off for the Lhotse Couloir. Rates run 30-40% overall, higher among the Everest-paired cohort. Failure modes mirror Everest’s (summit-day timing, oxygen logistics, weather), and the rise in Everest-Lhotse double summits has lifted its rates recently.
Mount Everest: where operator choice matters most
Everest’s 29% headline is a weighted historical average. Modern commercial expeditions run much higher – premium operators routinely report 65-85%, while budget operators sometimes drop to 30-40%. That 40-point gap is among the largest in commercial mountaineering. Failure modes are documented in our Everest summit-day failures investigation: time-budget overruns, queue exposure, and oxygen failures.
Matterhorn: lower alpine, higher technical
An outlier: modest altitude (4,478m) but a 25-35% rate because the technical demands are sustained. The Hörnli Ridge involves Class 4-5 climbing on rotten rock with heavy exposure, and weather windows are short. IFMGA-guided climbers succeed at 50-60% while independents run 15-25% – one of the largest guided/independent gaps anywhere in commercial mountaineering.
Dhaulagiri I: the White Mountain
A Tier II 8000er with lower rates than the commercial “first 8000ers” because its avalanche-exposed route demands more weather-window discipline. Rates run 20-35% by season. Commercial guiding is smaller-scale than on Everest or Manaslu, and climbers attempting it typically arrive with prior 8000m experience.
Makalu: the Black Pyramid
A Tier III 8000er more demanding than Everest’s South Col route, running 20-30%. The main failure modes are the sustained steep upper ridge and weather windows that can shut summit attempts for days. Makalu is sometimes called the “honest 8000er” – a test peak that separates climbers ready for Tier I-II peaks from those who relied on commercial infrastructure.
Kangchenjunga: the 3rd-highest peak
The world’s third-highest mountain and one of the most remote major peaks, running 15-25% on the standard route. The long approach, weather exposure, and sustained upper ridge make it harder than its raw altitude suggests. Climbers attempting it are typically experienced 8000m mountaineers, so the rate reflects the route itself rather than the cohort.
Extreme tier · under 20% (Killer Peaks)
The three Killer Peaks of the 14 eight-thousanders – Annapurna I, Nanga Parbat, and K2 – where success falls below 20% and preparation alone cannot close the gap. The lowest success rates here are paired with the highest fatality rates of any major mountains.
Annapurna I: the deadliest 8000er
The lowest success rate among commercial 8000m attempts and the highest fatality rate, running 15-20%. The dominant failure modes are avalanche-driven weather closures and exhaustion from the long approach, with fewer stable periods than peaks where summit timing is wind-dependent. Even among highly experienced 8000m mountaineers, the rate still hovers near 17%.
Nanga Parbat: the Killer Mountain
Rates run 15-20% on the Diamir Face standard route, held down by avalanche exposure, weather windows that can close for weeks, and a regional security situation that complicates rescue. The 2013 Diamir Base Camp attack remains a unique factor in planning. Success correlates strongly with prior Karakoram experience – climbers attempting it as their first Pakistani 8000er have particularly low rates.
K2: the Savage Mountain
The lowest commercial success rate of any major peak, running 10-18% by season. The Bottleneck, an overhanging serac feature at roughly 8,200m, is the dominant technical and objective hazard on the standard Abruzzi Spur. Recent commercial expansion has not raised the rate the way it did on Everest – K2’s mix of technical demands and weather windows resists commercialisation.
Peak-specific success rate pages
Each peak has its own page with month-by-month rates, route-by-route breakdowns, guided/independent splits, experience-level analysis, turnaround reasons, and historical trends.
High-volume peak pages
- Pico de Orizaba — Mexico’s highest peak, glaciated stratovolcano
- K2 — lowest commercial success rate of any 8000er
- Annapurna I — deadliest 8000er
- Matterhorn — technical Alpine classic
- Denali — North America’s highest peak
- Mount Everest — operator choice matters most
- Mont Blanc — the Alpine classic
- Mount Rainier — American mountaineering school peak
Eight-thousander pages
Trekking peaks & accessible summits
Summit success rate FAQ
What is a summit success rate?
The percentage of climbers who reach the actual summit, out of those who attempted the peak from base camp or trailhead in a season. Success means the official summit, not a false summit. Rates are computed from legal permit holders; turnarounds include weather holds, illness, voluntary retreats, and operator-mandated calls, with rescues tracked separately. Operator-reported rates run higher than park-wide rates because they capture a self-selected, better-prepared client base.
Which mountain has the lowest success rate?
K2, at roughly 14% – the severe technical demands (including the Bottleneck), narrow weather windows, and relative inexperience of some recent commercial climbers. Annapurna I (~17%), Nanga Parbat (~16%), and Kangchenjunga (~20%) round out the lowest tier, where the lowest success rates track the highest fatality rates.
Which mountain has the highest success rate?
Vinson Massif in Antarctica, at roughly 95% – a self-selected experienced base, ALE logistics, and a short technical climb. Island Peak (~80%), Elbrus (~72%), Kilimanjaro and Mera Peak (~65%), and Carstensz (~60%) complete the top tier: moderate altitude, good infrastructure, predictable windows, non-technical standard routes.
Why do guided climbers succeed more often?
Enforced acclimatisation schedules, real-time weather and turnaround judgment, and rescue coordination. The gap runs 15-25 points – Aconcagua guided ~51% vs 29% independent; Kilimanjaro guided ~65% vs ~45% independent. Independents who mirror guided discipline close most of the gap.
How much does timing matter?
A lot. Aconcagua’s January bids beat February by about 7 points; Everest peaks mid-May; Denali peaks June 1-20; Kilimanjaro has two windows (Jan-Feb, Jun-Oct) split by monsoons. The right month often matters more than the right operator.
How much does route choice matter?
The Normal Route is highest on every major peak. Aconcagua Normal 47% vs South Face 18%; Everest technical routes 5-10% vs the standard cols; Denali West Buttress 51% vs Cassin sub-30%. It reflects both lower technical demand and the infrastructure that clusters on the standard line.
Do rates trend over time?
Yes. Aconcagua’s 5-year average fell from 46% (2005-2009) to 38% (2020-2024); Everest rose from ~18% in the 1990s to ~65% recently per operator data. Climate change tends to lower success on glaciated peaks while commercial infrastructure raises it on the most-commercialised ones.
How are rates measured and verified?
By source: the Himalayan Database for Himalaya/Karakoram, the Mendoza Provincial Government for Aconcagua, the US National Park Service for Denali, and Tanzania National Parks plus KPAP for Kilimanjaro. We use park-wide rates as the headline where available and mark operator-specific data separately.
Sources & methodology
This hub aggregates data across 11 authoritative sources:
- The Himalayan Database (Salisbury/Hawley) — the archive for Himalayan and Karakoram peaks.
- Aconcagua Provincial Park Authority — Mendoza Provincial Government permit and summit records.
- US National Park Service, Denali — annual climbing reports via the concessionaire system.
- Tanzania National Parks Authority (TANAPA) — Kilimanjaro gate data.
- KPAP — operator-tracked success rates for member operators.
- Alan Arnette’s annual Everest by the Numbers — independent season review.
- ExpedReview 2026 — spring 2026 Everest season pricing and success data.
- American Alpine Club accident reports — for North American peaks.
- Operator-published rates — 8K Expeditions, Seven Summit Treks, Adventure Consultants, Furtenbach, RMI, Madison, IMG.
- Wilderness Medical Society — altitude-illness rate context.
- Mendoza Provincial Government permit data — Aconcagua season statistics.
Where operator-reported rates differ meaningfully from park-wide rates, we use the park-wide rate as the headline and call out operator-specific data separately. Figures reflect rolling 5-year averages where available, with single-season outliers noted. Published January 15, 2026; last updated July 14, 2026; next review November 2026.
Plan around facts, not folklore
Summit success rates are knowable, plannable, and improvable. The four drivers – timing, route, guide status, prior experience – are all under your control, and climbers who optimise across all four typically double their odds versus the published baseline. Pick your peak, then read its dedicated page for the disaggregated data.
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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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