The best time to hike the Everest Three Passes Trek is October to November and April to May. These windows give the most stable weather and the lowest chance of snow blocking Kongma La (5,535 m), Cho La (5,420 m) and Renjo La (5,360 m). Autumn has the clearest skies; spring is slightly warmer but hazier.
When is the best month for the Three Passes Trek?
October is the prime month for the Everest Three Passes Trek. The monsoon has ended, the three high passes are usually snow-free, and stable high pressure delivers reliable crossing windows. November stays clear but grows very cold, with nights above 5,000 m dropping below -15 °C and an increasing chance of early-season snow on the passes. Because pass timing is weather-dependent, building 2–3 buffer days into a 2026 itinerary is essential.
Why the passes make timing critical
Unlike the standard Base Camp route, the Three Passes loop lives or dies on whether the passes are crossable. Fresh snow can make Cho La's glacier and the steep approaches to Kongma La and Renjo La dangerous or impassable for days. This is why the shoulder edges of the season, early October and late April, are safer than December or March, when snow lingers. Local guides assess conditions daily and may reverse the loop direction to take the hardest pass in the best window.
Season-by-season conditions
| Season | Months | Pass conditions |
|---|---|---|
| Spring | Apr–May | Usually clear, warming, some haze |
| Monsoon | Jun–mid Sep | Wet, cloud, leeches low down |
| Autumn | Late Sep–Nov | Best: dry, snow-free, clear |
| Winter | Dec–Mar | Often snowbound, risky |
Is spring good for the Three Passes Trek?
Spring (April–May) is the second-best window and the choice for warmer pass crossings. Early April can still hold winter snow on the passes, so mid-April onward is safer. Afternoon haze builds toward late May, so start crossings early. Spring also lets you watch Everest summit teams gathering at Base Camp, which the loop passes through.
Why winter and monsoon are off-limits
Winter (December–March) usually leaves the passes snowbound, and several high teahouses close, making the loop dangerous without mountaineering kit. The monsoon (June to mid-September) brings rain, cloud-locked views and slick, snow-covered passes. Neither season suits the Three Passes loop, even though the lower Base Camp trail remains walkable.
Gear for cold, high crossings
Whatever the season, the passes are cold and exposed. Carry a sleeping bag rated to -15 °C, microspikes for Cho La, and a 50–60 litre pack such as the Zpacks Arc Haul Ultra 60 to hold the extra layers and food for long pass days. Self-carry trekkers gain comfort from the load-transferring Deuter Aircontact Lite 45+10, while ventilation-focused hikers prefer the Osprey Atmos AG 50.
Compare timing with the gentler Everest Base Camp Trek, which shares the same seasons but tolerates a wider weather margin because it has no passes. Check current conditions through the Nepal Tourism Board and altitude guidance from the Himalayan Rescue Association.
How does pass timing shape your itinerary?
Because the Three Passes loop depends entirely on crossable passes, smart scheduling starts with the weather, not the calendar. Many guides crossing in autumn 2026 will begin up the Gokyo valley and tackle Renjo La (5,360 m) first while acclimatised but fresh, saving the higher Kongma La (5,535 m) for later. If a storm dumps snow, the flexible response is to wait a day, reverse the direction, or skip the most exposed pass and rejoin the standard route. This is why a 20-day plan with 2–3 buffer days beats a tight 17-day schedule that leaves no room to wait out weather.
What daytime and night-time temperatures should you expect?
In peak October, daytime walking temperatures in the valleys sit around 5–12 °C, but the passes are colder and far windier, often near or below freezing by mid-morning. Nights at high camps like Lobuche (4,940 m), Gokyo (4,790 m) and Dzongla (4,830 m) drop to -10 °C in October and below -15 °C in November. Dawn pass starts in wind chill can feel like -20 °C, so a windproof down jacket and insulated gloves are non-negotiable. Carry a -15 °C sleeping bag and a roomy pack such as the Osprey Aether 65 or load-hauling Deuter Aircontact Core 50+10; ultralight hikers can trim grams with the Zpacks Arc Haul Ultra 60. Those wanting a wider weather margin can opt for the lower Everest Base Camp Trek instead of the full Three Passes loop.
Spring or autumn: which season suits the passes better?
Both peak windows work, but they trade off differently. Autumn (late September to November) delivers the clearest skies and the most stable, dry weather, with the passes usually snow-free, the reason it is the most popular choice. The cost is cold: November nights at high camps fall below -15 °C. Spring (April to May) offers warmer crossings and rhododendron blooms lower down, plus the buzz of Everest summit teams at Base Camp, but afternoon haze builds toward late May and early April can still hold winter snow on Kongma La (5,535 m) and Cho La (5,420 m). For the safest pass conditions in 2026, target early-to-mid October or mid-to-late April, the shoulders that avoid both lingering snow and peak cold. Carry a -15 °C sleeping bag and microspikes whichever season you pick, packed in a roomy carrier such as the Osprey Aether 65 or the lighter Zpacks Arc Haul Ultra 60 for the Three Passes loop.
Frequently Asked Questions
Can the Three Passes be closed by snow?
Yes. Fresh snow regularly blocks Cho La, Kongma La and Renjo La for days, especially from late November through March. Even in peak autumn, an early storm can force a wait or a route change. Always carry 2–3 buffer days for pass weather.
Is October or November better for the Three Passes Trek?
October offers warmer, more reliable pass crossings, while November brings the clearest skies but colder nights below -15 °C and a higher chance of early snow. October is the safer all-round choice; November rewards those who can handle the cold.
Which pass is hardest on the Three Passes Trek?
Cho La (5,420 m) is usually rated hardest because it includes a short glacier crossing where ice and fresh snow raise the risk. Kongma La (5,535 m) is the highest, and its boulder approaches are demanding when tired.
Can you do the Three Passes Trek in winter?
It is not recommended. From December to March the passes are typically snowbound and some teahouses close, requiring mountaineering equipment and experience. Most trekkers limit winter to the lower Everest Base Camp route instead.
How many buffer days should you plan for the passes?
Plan at least 2–3 buffer days within a 20-day itinerary. Pass crossings depend on daily weather, and a single storm can delay you. Buffer days also protect against Lukla flight cancellations at the start and end of the trek.
How far in advance should you book the Three Passes Trek?
Book 3–6 months ahead for peak October and April–May 2026 departures, when guides, porters and Lukla flights fill quickly. Early booking also secures buffer days into your 20-day itinerary, which you need because pass crossings depend on daily weather. Last-minute trips are possible in shoulder weeks but limit your choice of reputable operators.
