October

Gains

• ↑March marks the opening of Nepal's primary spring trekking season: Thorong La on the Annapurna Circuit reopens as the snow conditions improve, the Everest Base Camp route becomes accessible to all fitness levels without winter equipment, and the rhododendron forests of the Annapurna and Langtang regions are at their most spectacular — forests of 30-metre red, pink, and white trees in full bloom at 2,000–3,500m
• ↑Holi (Festival of Colours, date varies February–March) is celebrated with particular energy in Nepal: Kathmandu's squares fill with water balloons and coloured powder, and the celebration is more participatory and less managed than the Indian equivalent; the Durbar Squares in Kathmandu and Bhaktapur are the finest settings
• ↑Mountain visibility is excellent in March: the pre-monsoon air is still clear and the morning views of the Annapurna massif from Poon Hill at 3,210m (a 3–4 day approach) deliver the most photographed mountain panorama in the world — 13 peaks over 7,000m visible simultaneously at dawn in a 180° arc

Sacrifices

• ↓March sees the beginning of the spring trekking crowd: the Annapurna and Everest circuits are filling up, and popular tea houses on the EBC route require advance booking from March; the independent, empty-trail experience of January–February is replaced by a more organised circuit atmosphere
• ↓Pre-monsoon weather in March can bring afternoon cloud and occasional showers — the clearest mountain views are always in the morning (dawn to 10am) before cloud builds; afternoon visibility deteriorates faster in March than in October–November
• ↓Spring can bring pre-monsoon dust and haze to the Kathmandu Valley: the combination of construction dust, vehicle emissions, and agricultural burning creates periodic poor visibility days in the valley that don't affect the mountain views above 2,500m

Gains

• ↑April is the peak month for Mount Everest attempts: the Khumbu Icefall is in its most stable spring condition, and the summit window between the jet stream and the pre-monsoon is typically widest in mid-May (preparation begins in April); the Everest Base Camp trek in April encounters the most dramatic activity of the climbing season — helicopter resupply missions, Sherpa teams moving equipment, and the electricity of the world's highest sporting event
• ↑The rhododendron forests at maximum bloom: April extends the March rhododendron season to higher elevations — the Ghorepani-Poon Hill circuit passes through forests at 2,000–3,500m that are at their fullest colour in the first two weeks of April; the combination of flowering forests, snow-capped mountains, and warm hiking temperatures makes April the finest month for the Annapurna day-hike circuits
• ↑Kathmandu temperatures at 27°C are ideal for temple exploration: the Pashupatinath temple complex (the most sacred Hindu site in Nepal), the medieval city of Bhaktapur Durbar Square, and the Tibetan Buddhist circuit of Bouddhanath are all most comfortable in April's warm, clear pre-monsoon weather

Sacrifices

• ↓April is the busiest month for the Everest Base Camp route: the combination of Everest climbing season and spring trekking peak fills the Namche Bazaar lodges and the Tengboche Monastery surrounds; the EBC trail above Namche has the highest density of trekkers of any month, and solo/independent walkers will share the path with guided groups from every continent
• ↓70mm of rain in April includes some afternoon showers above 3,500m — occasional afternoon cloud and the first pre-monsoon build-up can reduce afternoon mountain visibility; morning starts are essential for Poon Hill, Kala Patthar, and other viewpoint objectives
• ↓Spring trekking accommodation pricing is at its annual high: tea houses on the Annapurna Circuit and EBC route price significantly above the October–November peak, and the most popular lodges in Namche Bazaar require booking 2–4 weeks ahead

Gains

• ↑May is Everest summit month: the weather window typically opens between May 10–25, and the concentration of summit attempts in this period creates the most dramatic high-altitude activity visible from EBC and Kala Patthar; watching 40–50 headlamps moving up the SE Ridge through binoculars from the EBC moraine at 3am is one of the most extraordinary viewing experiences in Nepal
• ↑Lower altitude trekking circuits (Poon Hill, Annapurna Sanctuary, Langtang Valley) remain excellent in May: the pre-monsoon warm temperatures, the tail of the rhododendron season, and the increasing lushness as moisture builds create beautiful hiking conditions at elevations below 3,000m
• ↑Pokhara and the lakeside are at their most alive in May: the paragliding season extends through May with excellent thermal conditions, the Fewa Lake kayaking is at its most pleasant, and the restaurants and bars of Lakeside have a warm social energy that the October crowd creates but May captures without the peak-season price

Sacrifices

• ↓Monsoon-driven cloud build-up accelerates through May: mountain viewpoints above 4,000m become progressively obscured after 9–10am as afternoon cloud builds; the critical Kala Patthar view of Everest summit requires a 4am start for clear visibility, and some May weeks see the mountain invisible from Base Camp for days at a time
• ↓130mm of rain and 72% humidity represent a significant shift from April — the lower valleys and Kathmandu city are warm and humid, and afternoon showers become a daily reality; high-altitude circuits above 5,000m are still dry but the approach valleys become muddier
• ↓The Khumbu Icefall becomes increasingly unstable in May as temperatures rise: summit teams accelerate their activity to complete rotations before the icefall deteriorates; this creates a deadline-driven, high-energy atmosphere at EBC that is fascinating to observe but signals the approaching monsoon closure

Gains

• ↑October delivers Nepal's most celebrated conditions: the monsoon has ended, the air has been washed clean, and the Himalayan panoramas — Everest from Kala Patthar, Annapurna from Poon Hill, Ganesh Himal from Nagarkot — are at their sharpest and most dramatic; photographers and trekkers specifically plan years around October visits
• ↑Dashain (Nepal's most important Hindu festival, date varies late September–October) transforms the country: a 10–15 day celebration featuring kite-flying, family reunions, animal sacrifices at Durbar Squares, and the blessing of children by elders with tika (coloured powder and yoghurt); the atmosphere in Kathmandu during Dashain is the most culturally charged of any month
• ↑Tihar (Festival of Lights, October–November, 5 days): Nepal's equivalent of Diwali, celebrated with oil lamp rows, the worship of crows, dogs, and cows, and the extraordinary Lakshmi Puja evening when the Kathmandu Valley is lit from every window with oil lamps and strings of lights; Tihar in Bhaktapur's medieval Durbar Square is one of the most visually beautiful cultural events in South Asia

Sacrifices

• ↓October is the most competitive accommodation month in Nepal: the EBC route lodges in Namche Bazaar, Tengboche, and Gorak Shep book out weeks to months in advance; the Annapurna Circuit tea houses similarly fill rapidly; arriving without confirmed accommodation for the high-altitude stages of any circuit in October is inadvisable
• ↓October peak season pricing: tea house rates double or triple from monsoon prices, guides and porters charge premium rates, and permit prices for restricted areas are unchanged but the total trip cost is highest of any month
• ↓Dashain creates specific practical challenges: many Kathmandu shops, restaurants, and services close for 10 days around the festival; bank hours change, tourist taxis become harder to find as drivers return to their home villages, and logistics around the festival period require advance planning

Gains

• ↑November is the second-finest trekking month and significantly calmer than October: the Dashain-Tihar crowd has dissipated, tea house rates have softened from the peak, and the clear mountain conditions continue uninterrupted — November is specifically recommended for the Annapurna Circuit as the Thorong La pass is reliably clear and the trail is less densely populated than in October
• ↑Mani Rimdu festival (Tengboche Monastery, October–November date varies): the 19-day Sherpa Buddhist ceremony culminating in masked dances and sacred performances at Tengboche is the most important festival in the Everest region; timing an EBC trek to coincide with Mani Rimdu creates an experience that connects the trekking culture with the spiritual foundation of the Sherpa communities
• ↑The Annapurna Circuit in November: the full circuit including Thorong La (5,416m) is accessible until late November; the trail is drier, colder, and less crowded than October, and the autumn colours on the lower oak and maple forests below Pisang and Manang add a visual dimension absent in October's already-bare upper valleys

Sacrifices

• ↓Temperatures drop sharply in November: high passes see night temperatures of -5°C to -15°C, and the EBC route above 4,000m requires full cold-weather gear; the pleasant daytime warmth is offset by genuinely cold mornings and evenings that require quality equipment
• ↓November is the final reliable month for high passes: the first significant snowfall typically arrives in late November or December on Thorong La; trekkers planning the high passes should aim for early-to-mid November to ensure clear access
• ↓Some higher-altitude teahouses begin to close in late November as the approaching winter reduces trekker numbers — facilities above 4,500m on both the EBC and Annapurna Circuit become more limited toward month's end