Best Time to Climb Everest: A Practical Guide to Summit Seasons

Best Time to Climb Everest – Short Answer

The best time to climb Everest is during the pre-monsoon season, particularly from late April through the end of May. Within that window, most successful summits happen between May 10 and May 25, when the jet stream has shifted away from the mountain and wind speeds at the summit drop enough to make a push feasible.

But that answer is too simple for a decision this serious.

An Everest expedition is not a fixed-date event. It is a months-long process built around acclimatization, rope fixing, weather forecasting, and waiting for the right summit window. The best time to climb is not just a date on the calendar—it is the intersection of weather, route conditions, your physical readiness, and the expedition’s operational planning.

This guide explains how that intersection works, what you gain and lose in each season, and what you should understand before choosing an expedition date.

Why Climbing Season Exists at All

Mount Everest is technically climbable year-round, but in practice, only two periods offer realistic conditions for a summit attempt: pre-monsoon spring (April–May) and post-monsoon autumn (October–November). Winter attempts are extremely rare and have succeeded only a handful of times. The monsoon makes climbing functionally impossible during summer.

The reason comes down to three interconnected factors: wind, temperature, and precipitation.

The Jet Stream and Summit Winds

For most of the year, the subtropical jet stream sits directly over the Himalayan range. At the summit of Everest, this translates to winds that regularly exceed 100 mph (160 km/h). In winter, they can reach 175 mph (280 km/h) or more. No climber can survive prolonged exposure to those conditions, and no fixed ropes remain intact.

Twice a year, the jet stream migrates northward or southward as seasonal weather patterns shift. In spring, it moves north as the Asian landmass warms. In autumn, it shifts northward again after the monsoon retreats. During these transitions, there is a window of several weeks when summit winds drop to manageable levels—often 20 to 40 mph (32 to 64 km/h)—and remain stable enough for a multi-day summit rotation.

Temperature: Cold Enough for Ice Stability, Warm Enough for Survival

Summit temperatures on Everest are below freezing year-round. In May, they typically range from -15°F to -30°F (-26°C to -34°C) at night, warming slightly during the day. This is brutally cold but survivable with proper equipment and adequate oxygen.

In winter, summit temperatures can drop below -60°F (-51°C), with wind chill making it far worse. Frostbite becomes almost unavoidable, and exposed skin freezes in minutes.

Precipitation and the Monsoon

The South Asian monsoon arrives in Nepal in June and lasts through September. It dumps enormous amounts of snow on the high peaks, creates extreme avalanche danger, and makes climbing routes impassable. By October, the monsoon retreats, leaving behind a mountain that has been cleaned of some loose debris but also covered in new snow.

The pre-monsoon season benefits from months of cold, dry weather that has stripped away loose rock and consolidated the snowpack. The post-monsoon season starts with more snow on the ground but benefits from generally clearer skies.

The Pre-Monsoon Season: April to May

This is the primary Everest climbing season. Approximately 90% of all Everest summits have occurred during the spring season, and for good reason.

April: Building, Acclimatizing, Waiting

April is not a summit month for most expeditions. It is the month of arrival, acclimatization, and route preparation.

Expeditions typically begin trekking into Everest Base Camp (EBC) in early to mid-April. Climbers spend the rest of the month doing acclimatization rotations: climbing up to Camps I, II, and sometimes III before descending back to base camp to recover. This is also the month when the “Icefall Doctors”—the specialist Sherpa team—begin fixing ropes and ladders through the Khumbu Icefall.

April weather is variable. You can expect strong winds at higher elevations, cold temperatures, and occasional snowfall. The mountain is not yet ready for summit attempts because the jet stream has not fully shifted and fixed ropes have not been installed all the way to the summit.

For a climber, April is physically demanding and psychologically trying. You are not climbing toward the summit yet. You are doing the repetitive, exhausting work of acclimatizing—climbing high, sleeping low, and waiting.

May: The Summit Window

By early May, the rope fixing has typically progressed toward the South Col and the summit. The jet stream has usually shifted enough to reduce summit winds. This is when the waiting begins in earnest.

Expedition leaders monitor multiple weather forecasting services, sometimes receiving updated models several times per day. When a window of acceptable weather appears—typically 3 to 5 days of lower wind, minimal precipitation, and stable temperatures—expeditions begin their summit rotation.

Most summits happen between May 10 and May 25, but this is not a guarantee. Some years, the window opens earlier. In other years, it opens later or barely opens at all. In 2019, a narrow summit window created the infamous traffic jam at the Hillary Step, with long lines of climbers waiting in the death zone. In 2021, a cyclone delayed the season but ultimately allowed a successful window in the final days of May.

The key point: May offers the best statistical chance of acceptable summit weather, but every year is different. Climbers must arrive fit, acclimatized, and ready to move when the window opens—or accept that there may be no window at all.

Advantages of Pre-Monsoon

• Best weather window for summiting — the highest probability of low summit winds

• Most established logistics — the majority of expeditions, rope-fixing teams, and support infrastructure are in place

• Greatest social support — more climbers, more shared resources, more collective knowledge at base camp

• More flexibility — if you miss an early window, a second window often opens later in May

• More accurate forecasting — with so many expeditions monitoring conditions, information is shared and refined

Disadvantages of Pre-Monsoon

• Crowds — hundreds of climbers, plus support staff, at base camp and on the mountain

• Traffic jams in the death zone — narrow weather windows can concentrate summit attempts into the same days

• Higher cost — peak season pricing for permits, logistics, and expedition fees

• Khumbu Icefall instability — the icefall is generally more stable in spring than autumn, but it remains one of the most dangerous sections of the climb

• Increasing warmth — by late May, warmer temperatures can soften ice and increase rockfall risk in certain sections

The Post-Monsoon Season: October to November

The autumn season is shorter, colder, and less popular than spring, but it has distinct advantages for certain climbers.

October: A Fresh Mountain, but New Snow

After the monsoon retreats in September, the mountain is covered in fresh snow. The Khumbu Icefall has been reshaped by monsoon precipitation and glacier movement. Fixed ropes and ladders from the spring season have been largely destroyed or buried and must be re-installed.

October expeditions typically arrive in early October and begin acclimatization immediately. The weather is generally clearer than spring, with less precipitation and more stable skies. But temperatures are colder, especially at higher elevations.

Summit windows in October are typically shorter and less predictable than in May. The jet stream shifts, but not as consistently, and the window for acceptable summit conditions can be compressed.

November: A Narrowing Opportunity

By November, winter is approaching. Temperatures drop, winds increase, and the mountain becomes increasingly hostile. Some expeditions target early November for a summit push, but the window is narrow. If you miss it, there is no second chance—the season is over.

Autumn expeditions see far fewer climbers than spring. In some years, fewer than 50 climbers attempt Everest in autumn, compared with 500+ in spring.

Advantages of Post-Monsoon

• Fewer people — dramatically less crowded at base camp and on the mountain

• Clearer skies — post-monsoon air is often cleaner, offering better visibility

• Fresh snow conditions — some climbers prefer the aesthetic and climbing conditions of fresh snow

• Cooler temperatures at lower elevations — the trek to base camp is more comfortable than in spring

• More solitude — for climbers who value isolation, autumn offers a very different experience

Disadvantages of Post-Monsoon

• Shorter summit window — less time for acclimatization and fewer weather windows

• Colder temperatures — summit and high camp temperatures are noticeably colder than spring

• Less infrastructure — fewer expeditions, fewer ropes, and slower rope-fixing progress

• More snow on the route — fresh monsoon snow can create challenging conditions and increased avalanche risk in certain areas

• No second chance — if the summit window closes early, the season is over

• Fewer support services — fewer medical resources, fewer rescue options, less backup

Month-by-Month Assessment 

January–February: Winter Climbing — Only for the Exceptional Few

Winter on Everest is severe. Summit winds are extreme, temperatures can drop below -60°F (-51°C), and the risk of frostbite and altitude-related illness is highest. Only a small number of climbers have ever summited Everest in winter, and the first true winter ascent was not completed until 1980 (by a Polish team led by Andrzej Zawada). Since then, winter ascents have remained extremely rare.

For almost every climber, winter is not a realistic option. The risks far outweigh any possible benefit.

March: Too Early

March marks the beginning of the pre-monsoon transition, but the jet stream still often sits over the mountain. Winds at the summit remain high, and base camp itself is cold and uncomfortable. Some small teams attempt early-season climbs, but success rates are low, and the fixed ropes are not yet in place.

April: Acclimatization Month

April is when the mountain comes alive. Climbers arrive, acclimatize, and prepare for May. Conditions at base camp are moderate—often pleasant during the day, with cold nights. Higher on the mountain, winds are still strong, and summit attempts are not realistic.

If your goal is to summit, April is about preparation. You are building your body’s ability to function at altitude, learning the route, and waiting for the weather to shift.

May: The Summit Month

This is the month that matters most. Most summit attempts happen in the second and third weeks of May. The weather is as stable as it gets, winds are manageable, and the fixed ropes are fully installed.

But May is also the month of maximum traffic. You will share the mountain with hundreds of other climbers. Patience, flexibility, and a well-organized expedition team are essential.

June: Monsoon Arrives

By early June, the monsoon has typically arrived in Nepal. Heavy snowfall, poor visibility, and high winds make climbing impossible. Most expeditions have packed up and left by the end of May or the first week of June.

A few teams have attempted late-season summits in early June during exceptional weather years, but this is risky and not recommended.

July–September: Monsoon Season — No Climbing

The South Asian monsoon dominates Nepal from late June through September. The amount of precipitation at high elevations is enormous, avalanche danger is extreme, and the mountain is effectively closed for climbing.

This is also the season when the Khumbu Icefall is most unstable, as monsoon warmth and moisture destabilize the glacier.

October: Second Season Begins

By October, the monsoon has retreated. The sky clears, and a brief post-monsoon window opens. Temperatures are colder than spring, and summit winds can be variable. The number of climbers is far lower.

October is a viable option for climbers who prefer fewer crowds and are willing to accept a shorter weather window and colder conditions.

November: The Season Closes

Early November can still offer summit opportunities, but each passing week brings colder temperatures and higher winds. By mid-to-late November, the autumn season is effectively over.

November expeditions require a higher tolerance for cold and a willingness to turn around if the weather window does not materialize.

December: Winter Begins

December is a winter month on Everest. Summit winds return, temperatures plummet, and the mountain enters its most hostile period. Like January and February, December is not a realistic option for the vast majority of climbers.

The Real Variables Behind “Best Time”

Understanding the best time to climb requires understanding what actually determines success. The calendar month is just the container. The real variables are:

Summit Windows

A summit window is a period—usually 3 to 5 days—when winds at the summit drop below approximately 30–40 mph (48–64 km/h), temperatures are within a survivable range, and precipitation is minimal. These windows are predicted by professional meteorologists who specialize in high-altitude forecasting.

In May, there may be two or three summit windows. In October, there may be only one. In some years, there may be none at all.

The best time to climb is when a summit window opens and you are in a position—acclimatized, healthy, and ready—to use it.

The Jet Stream Position

The single most important factor for summit success is wind. The jet stream controls wind. When the jet stream sits over the mountain, summit winds are too high. When it shifts away, a window opens.

In spring, the jet stream shifts gradually northward as the Asian continent warms. The shift is usually complete by mid-May, which is why summit attempts cluster in the second half of the month.

In autumn, the jet stream shift is less predictable and shorter-lived, which is why the October–November window is narrower.

Temperature Trends

May temperatures at the summit are survivable with modern equipment and supplemental oxygen. October is colder but still manageable for experienced climbers. Winter is beyond survivable for nearly everyone.

Precipitation and Snow Conditions

Fresh snow can be beautiful but dangerous. It increases avalanche risk, slows progress, and makes route-finding more difficult. The pre-monsoon season benefits from months of dry weather that have stabilized the snowpack. The post-monsoon season starts with fresh snow from the monsoon, which requires more careful route assessment.

Crowd Dynamics

The pre-monsoon season has a predictable crowd pattern: hundreds of climbers at base camp, busy fixed ropes, and potential traffic jams during summit windows. The post-monsoon season has far fewer climbers, but also fewer resources and less infrastructure.

The best time for you may not be the best time statistically. If you value solitude and are willing to accept a shorter window, October may serve you better than May. If your priority is the highest probability of success, May is the clear choice.

Summit Climbing vs. Base Camp Trekking: A Crucial Distinction

Before going further, it is important to clarify a point that many online resources obscure: climbing Everest and trekking to Everest Base Camp are fundamentally different activities with different seasonal considerations.

Everest Base Camp Trek

The trek to Everest Base Camp is a high-altitude trek that can be done in most months, with the best trekking seasons being March–May and September–November. The trek reaches approximately 17,598 ft (5,364 m) at base camp, which is high but not in the death zone. No technical climbing is required.

Trekking season is broader than climbing season because trekkers do not need summit windows. They need manageable weather for walking, good visibility, and reasonable temperatures. The monsoon makes trekking unpleasant but not impossible.

Everest Summit Expedition

An Everest summit expedition is a technical mountaineering objective that requires climbing to 29,032 ft (8,849 m), using fixed ropes, ladders, and supplemental oxygen. Success depends on summit windows, not just general weather conditions.

Climbing season is narrow because summit conditions are only favorable during specific windows. The distinction matters because a season that works for trekking may not work for climbing, and vice versa.

Many articles about the “best time to climb Everest” conflate these two activities, which leads to confusion. If you are planning a trek, your constraints are different. If you are planning a summit attempt, the information in this article applies directly.

How Expedition Teams Make the Timing Decision

Experienced expedition operators do not simply pick a date and hope it works. They build flexibility into the entire schedule.

Arrival Timing

Most spring expeditions plan to arrive at base camp by early to mid-April. This allows enough time for acclimatization rotations (typically 3–4 weeks) before the summit window opens in May. Arriving later shortens your acclimatization and reduces your chances of being ready when the window opens.

Acclimatization Before the Window

The first few weeks on the mountain are not about the summit. They are about preparing your body. Climbers do rotations to progressively higher camps, returning to base camp between each rotation to recover.

By the time the summit window opens, a properly acclimatized climber has spent multiple nights at or above 21,000 ft (6,400 m) and is physiologically prepared for the final push.

Monitoring the Forecast

From early May onward, expedition leaders monitor multiple forecasting services daily. The forecasts use satellite data, weather balloon readings, and computer models to predict conditions at 29,000+ ft.

When a window is predicted, teams begin preparing for the summit rotation. This may involve moving to Camp II or Camp III in advance, checking oxygen supplies, and making final gear preparations.

The Summit Rotation

A typical summit rotation from base camp takes 4–6 days:

1. Base Camp to Camp II — a long day through the Khumbu Icefall and up the Western Cwm

2. Camp II to Camp III — a moderate day up the Lhotse Face

3. Camp III to Camp IV (South Col) — a demanding day to the highest camp

4. Summit push — starting late evening, climbing through the night, reaching the summit in the early morning, then descending to Camp IV or lower

5. Descent to base camp — the long way down

Expedition teams time their summit rotation to hit the summit during the best weather days of the window. This is where experience matters: the best teams know when to move and when to wait.

Contingency Planning

A good expedition plan includes contingencies for missed windows, delayed rope fixing, illness, and other setbacks. The best operators build in extra days so that climbers have a second chance if the first window fails.

Best Time to Climb Everest – Seasonal Comparison

What “Best Time” Means for Different Climbers

The best time to climb depends on who you are and what you want from the experience.

For a First-Time 8,000m Climber

If this is your first 8,000m peak, spring is the better choice. The weather window is more reliable, the infrastructure is more developed, and there are more support resources available. The crowds are a real downside, but the advantages of a longer season and better forecasting outweigh them.

For an Experienced Climber Seeking Solitude

If you have already climbed other 8,000m peaks and want a more solitary Everest experience, autumn may appeal. You will share the mountain with far fewer people, but you will need to be more self-sufficient and accept a higher probability of turning around without summiting.

For a Climber with Limited Time

If you have limited time, autumn is paradoxically both better and worse. The season is shorter, which may work if your schedule aligns with the October window. But if that window does not materialize, you have no backup. Spring requires more total time but offers more flexibility.

For a Climber Prioritizing Success

If your primary goal is to stand on the summit, spring is the clear choice. The statistical probability of success is higher, and the presence of multiple summit windows provides insurance against bad weather.

For a Climber Concerned About Safety

Both seasons have safety risks, but they are different. Spring carries crowd-related risks (traffic jams, oxygen depletion, delays in the death zone). Autumn carries environmental risks (colder temperatures, less infrastructure, fewer rescue options). A climber who values the largest support system should choose spring; a climber who wants to minimize crowd exposure should consider autumn.

Practical Planning Timeline

12–18 Months Before Your Expedition

• Choose a reputable expedition operator with a strong safety record and experienced leadership

• Begin physical training, including cardiovascular endurance, strength training, and altitude simulation where possible

• Secure funding and understand the full cost breakdown

• Review your high-altitude climbing experience and identify gaps

6–12 Months Before Your Expedition

• Complete at least one high-altitude climb (ideally above 6,000 m / 20,000 ft)

• Finalize your expedition booking and understand the operator’s schedule

• Begin gear acquisition, including personal climbing gear, clothing, and personal oxygen equipment

• Obtain medical clearance, including a thorough cardiac and pulmonary evaluation

3–6 Months Before Your Expedition

• Continue training with increased focus on load carrying and endurance

• Practice technical skills: fixed rope ascension, rappelling, crampon technique, ice axe self-arrest

• Understand the route and the specific challenges of each section

• Complete all vaccinations and travel medical preparation

1–2 Months Before Your Expedition

• Taper your training while maintaining fitness

• Review all gear and make final purchases

• Prepare your home and work arrangements for a 6–8 week absence

• Arrive in Kathmandu with time to complete permits and final preparations

During Your Expedition

• Listen to your expedition leader and Sherpa team

• Be patient during acclimatization

• Be ready to move when the summit window opens

• Know your limits and be willing to turn around

Why Weather Forecasting Matters More Than the Calendar

One of the most important things to understand about Everest is that the calendar is just a guide. What actually determines whether you summit is the weather during your specific summit window.

Expeditions use multiple meteorological services, including:

• Mountain weather forecasting specialists who provide detailed models for 8,000m peaks

• National meteorological agencies that provide broader regional forecasts

• Satellite-based observation that tracks jet stream movement and storm systems

• Experienced local knowledge from Sherpa climbers who have spent decades on the mountain

In a typical spring season, expedition leaders might check forecasts three or four times daily. They look for:

• Wind speeds at 8,000m and above

• Temperature at the summit and high camps

• Precipitation probability

• Jet stream position

• Storm systems developing in the Bay of Bengal or the Arabian Sea

The decision to launch a summit push is never taken lightly. It involves weighing forecast confidence, team readiness, route conditions, and the psychological state of the climbers.

Choosing an Expedition Operator: What Timing Reveals

The way an expedition operator thinks about timing tells you a lot about their professionalism. When evaluating an operator, ask:

• How do they handle summit windows? A good operator will explain their decision-making process, not just say “we’ll see when we get there.”

• What is their contingency plan if the first window fails? A professional operator will have a clear strategy for a second attempt.

• How do they balance acclimatization with weather windows? The tension between being properly acclimatized and being ready to move when the window opens is real. A good operator manages this carefully.

• What forecasting services do they use? If an operator cannot answer this question, that is a red flag.

• How many climbing Sherpas per client? This affects both safety and summit success. A ratio of at least 1:1 is standard for serious expeditions.

A Note on Wonder Hikes Nepal

Wonder Hikes Nepal organizes Everest expeditions and high-altitude treks with a focus on safety, proper acclimatization, and realistic expedition planning. For climbers considering an Everest attempt, the team can discuss seasonal timing, route logistics, and what to expect during the expedition process. The decision to climb Everest should always be made with full awareness of the risks, costs, and physical demands involved.

If you are beginning to research an Everest expedition, the most useful next step is to contact an experienced operator and ask direct questions about their seasonal planning, safety protocols, and contingency strategies. Timing is one of many factors that determine your experience, and a reputable operator will help you understand it in context.

Common Misconceptions About Everest Climbing Seasons

“If I go in May, I will definitely summit.”

No. Even in the best season, summit success rates are around 50–60% for commercial expeditions. Weather windows can fail to materialize, illness can strike, and altitude can force a turn-around regardless of the calendar.

“October is a bad time to climb.”

Not necessarily. October offers a legitimate summit opportunity, especially for experienced climbers. The crowds are smaller and the skies are clearer. But the window is shorter and less predictable.

“April is the best time to climb because the weather is warming.”

April is the acclimatization month, not the summit month. You cannot realistically summit in April because summit winds are still too high and fixed ropes are not yet installed. The warming in April is a prerequisite for the May window, not the window itself.

“Everest Base Camp is the same as climbing Everest.”

This is a critical misunderstanding. Trekking to base camp is a trekking objective; summiting Everest is a mountaineering objective. The seasons overlap but are not the same. Base camp trekking is viable from March to May and from September to November, while summit climbing is concentrated in late April–May and October–early November.

“The Khumbu Icefall is the most dangerous part of the climb in May.”

The Khumbu Icefall is dangerous year-round, but its specific hazards shift. In spring, the route is more established and heavily trafficked, but the glacier is relatively stable. In autumn, fresh snow and glacier movement require re-routeing and can create new hazards. The icefall is always a risk; the specific nature of that risk changes with the season.

“You can avoid crowds by climbing in April.”

April is less crowded than May in terms of summit attempts, but the mountain is still busy. The acclimatization rotations happen in April, so you will still encounter many climbers on the route. The only real way to avoid crowds is to climb in autumn or attempt a non-standard season, both of which carry their own risks.

Final Assessment on Best Time to Climb Everest: When Should You Climb?

For most climbers, the answer is clear: plan your summit attempt for the pre-monsoon season, with the expectation that your summit push will happen between May 10 and May 25.

This gives you the best probability of acceptable weather, the most developed infrastructure, the strongest contingency options, and the highest statistical likelihood of success.

But the best time is not just about probability. It is about what you want from the mountain. If you want solitude, choose autumn. If you want the greatest chance of standing on the summit, choose spring. If you want to avoid crowds but maximize weather, there is no perfect answer—there is only a trade-off.

The mountain does not bend to calendars. It rewards patience, preparation, and respect. Choose your season wisely, but know that the real decision is not when to go—it is whether you are ready to accept whatever the mountain gives you.

FAQs about the Best Time to Climb Everest

1. What is the best time to climb Everest?

The best time is during the pre-monsoon season from late April to the end of May, with most summits occurring between May 10 and May 25 when summit winds drop and the jet stream has shifted away from the mountain.

2. Can you climb Everest in October?

Yes. October is a viable summit season, but the weather window is shorter and less predictable than spring. Temperatures are also colder. Fewer climbers attempt Everest in autumn, which reduces crowds but also reduces infrastructure and support.

3. What is the difference between the Everest Base Camp trek and climbing Everest?

The Everest Base Camp trek is a high-altitude trek reaching approximately 17,598 ft (5,364 m) and requires no technical climbing. Climbing Everest involves technical mountaineering to 29,032 ft (8,849 m), requiring fixed ropes, supplemental oxygen, and advanced climbing skills.

4. How many summit windows are there in a typical spring season?

In a typical spring, there are usually two to three summit windows between early May and late May. Some years have more; some have fewer. In bad weather years, there may be no viable summit window at all.

5. What is the summit temperature on Everest in May?

Summit temperatures in May typically range from -15°F to -30°F (-26°C to -34°C) at night, warming slightly during the day. With wind chill, it can feel far colder.

6. Why is the jet stream important for Everest climbing?

The jet stream controls summit winds. When it sits over the mountain, winds exceed 100 mph and make climbing impossible. The climbing season exists because the jet stream shifts twice a year, allowing summit winds to drop to manageable levels.

7. Is winter climbing on Everest possible?

It is possible but extremely rare. Summit winds exceed 150 mph, temperatures drop below -60°F (-51°C), and the risk of frostbite and altitude illness is severe. Only a handful of climbers have ever summited in winter.

8. How long does an Everest expedition take?

A full expedition from arrival in Nepal to summit attempt and return typically takes 6–8 weeks. This includes the trek to base camp, acclimatization rotations, waiting for a summit window, and the summit rotation itself.

9. What happens if there is no summit window during your expedition?

If the weather window never opens, you do not summit. This is a real possibility in any season. A reputable expedition operator will make every effort to use the available windows, but no one can guarantee a summit.

10. Why are there so many crowds on Everest in May?

Because May is statistically the best month for a summit attempt, most expeditions schedule their climbs for the pre-monsoon season. When summit windows are narrow, hundreds of climbers may attempt the summit on the same days, creating traffic jams.

11. Can you climb Everest during the monsoon?

No. The monsoon (late June through September) brings heavy snowfall, extreme avalanche danger, and impossible climbing conditions. The mountain is effectively closed during this period.

12. What is the success rate for Everest summit attempts?

Success rates vary by year, season, and expedition operator. In spring, commercial expedition success rates are typically around 50–60%. Autumn rates are generally lower due to the shorter weather window and colder conditions.

13. Is it cheaper to climb Everest in the autumn?

Yes, autumn expeditions are often somewhat less expensive than spring expeditions due to lower demand. However, the price difference is not dramatic, and the shorter weather window means you have fewer backup options.

14. Do you need supplemental oxygen to climb Everest?

Almost all climbers use supplemental oxygen from Camp III or Camp IV upward. A small number of elite climbers have summited without oxygen, but this is extremely dangerous and not recommended for most climbers.

15. How fit do you need to be to climb Everest?

You need exceptional cardiovascular fitness, muscular endurance, and the ability to function at extreme altitude. Most successful climbers spend 12–18 months in training before attempting Everest and have prior high-altitude climbing experience above 6,000 m (20,000 ft).