Autumn: The Classic Trekking Season (September to November)

Trekking to Everest Base Camp has traditionally been popular during the autumn season, which offers stable weather and clear skies.  However, recent climatic shifts have impacted on the reliability of early autumn treks, particularly in September.

Meteorological data indicates that Nepal’s monsoon season, which typically concludes around the 23^rd of September, has been extending into October in recent years.  For instance, in 2024, the monsoon commenced on the 10^th of June, three days earlier than usual, and its withdrawal was delayed, with significant rainfall occurring in late September and into early October.  This shift resulted in prolonged heavy rainfall, leading to wet and slippery trails, and at elevations above 4,000 meters, heavy snowfall hindered trekking with many groups having to turn back.

The Tenzing-Hillary Airport in Lukla, the primary gateway for EBC trekkers, is notorious for unpredictable weather conditions.  The extended monsoon contributes to frequent flight delays and cancellations due to poor visibility and adverse weather.  In October 2024, flights between Manthali/Ramechhap and Lukla were suspended for several days because of deteriorating weather conditions in the Khumbu region.  Such disruptions can lead to significant delays, affecting trekking schedules and increasing logistical challenges.

Given these developments, September has become less reliable for trekking to EBC.  The lingering monsoon can result in muddy and treacherous trails, obscured mountain views due to persistent cloud cover, increased risks associated with heavy snowfall at higher elevations, and ultimately an aborted trek.  Additionally, the potential for flight cancellations to and from Lukla adds uncertainty to travel plans.  Trekkers considering a September expedition should be prepared for these challenges and remain flexible with their itineraries.

That said, from mid-October and into late-November the weather is generally stable, and conditions are normally very favourable for trekking to Everest Base Camp.

Spring: A Vibrant Alternative (March to May)

With the early autumn trekking season becoming increasingly unpredictable due to the lingering monsoon, many trekkers are turning to the pre-monsoon spring season (March to May) as a better alternative.  Spring offers relatively stable weather, warmer temperatures, and clear skies, making it an excellent time to trek to Everest Base Camp.  In addition to this, the Nepali Government only allows climbing on Everest in the Spring season, so Everest Base Camp itself will be bustling with climbers getting ready for their ascent although this can also make the trail much busier.

During these months, temperatures gradually rise, with daytime highs ranging from 5°C to 15°C at lower elevations.  Nights remain cold, particularly above 4,000m, but the overall conditions are more comfortable than in winter.  The trails come alive with blooming rhododendrons and other alpine flowers, adding to the beauty of the trek.  The air is generally drier, meaning better visibility of Everest and surrounding peaks.  However, as the season progresses into late May, temperatures at lower altitudes can become uncomfortably warm, and pre-monsoon storms occasionally bring snowfall to higher elevations.

One advantage of trekking in spring is that flights to and from Lukla are typically more reliable than in autumn.  The extended monsoon has led to increasing disruptions in September and early October, while in spring, flight delays are less frequent due to clearer skies.  However, as with any Himalayan trek, it’s still wise to factor in potential weather-related delays.

For trekkers seeking the best balance of weather, trail conditions, and reliable flights, the period from late March to early May is perhaps the best time for an Everest Base Camp trek.

Winter: A Quiet but Harsh Adventure (December to February)

Trekking to Everest Base Camp in winter is possible, but it comes with significant challenges.  Temperatures plummet, with nighttime lows reaching -20°C or colder at higher elevations.  The extreme cold can make the trek physically demanding, and snow accumulation can make certain sections of the trail difficult or even impassable.

That said, winter trekking offers unique advantages.  The trails are far less crowded, allowing for a more peaceful and intimate experience with the mountains.  The skies are often crystal clear, providing stunning views of Everest and its neighbouring peaks.  Additionally, teahouses are less busy, meaning more availability and quieter stays.

For experienced trekkers who are well-prepared for extreme cold and potential snowfall, a winter trek can be an incredibly rewarding challenge.  However, it’s essential to carry proper winter gear, be prepared for harsh conditions, and factor in potential weather-related disruptions.

Monsoon: The Least Favourable Season (June to September)

The monsoon season, from June to September, is the least favourable time to trek to Everest Base Camp.  Heavy rainfall makes the lower trails muddy and slippery, and cloud cover often obscures mountain views.  At higher elevations, the increased moisture can lead to dangerous landslides and avalanches.

Additionally, flight disruptions to and from Lukla are frequent due to poor visibility.  Leeches and other pests can be an annoyance on the lower portions of the trail, and the constant rain can make for an uncomfortable trek.

While some trekkers attempt the EBC trek in monsoon season, it is not recommended unless you have significant trekking experience and are willing to face unpredictable conditions.  Alternative trekking destinations in the rain-shadow areas of Nepal, such as Upper Mustang or Dolpo, might be better choices during this time.

Final Thoughts: Choosing the Right Season for Your EBC Trek

To enhance the likelihood of favourable trekking conditions, it is advisable to plan EBC treks during the late autumn months (mid-October to late-November) or in the pre-monsoon spring season (March to May).  These periods typically offer more stable weather, clearer skies, and safer trail conditions.  However, it is essential to stay updated on current weather patterns and consult with a well informed and reliable trekking agency when planning your journey, as climate change continues to influence weather unpredictability in the region.

By acknowledging and adapting to these climatic shifts, trekkers can better prepare for a safe and rewarding Everest Base Camp experience.

Thinking of climbing Kilimanjaro, why not read our article on the best time to go.