Spring is the most reliable trekking season in Nepal. The monsoon is months away, the post-winter cold has lifted, and the trails are active. But spring is not a single uniform window. March and April behave differently on the mountain, and the right month for one trekker is the wrong month for another depending on the route, the altitude, and what they want from the experience.
This article breaks down the practical differences between March vs April trekking in Nepal, covers what changes at each elevation band across both months, and maps those conditions to the specific departures Glacier Safari Treks runs this season.
Temperature: What to Expect at Trail Level
March opens cold. At lower elevations on routes like the Langtang Valley or the Annapurna foothills, daytime temperatures in early March sit between 8 and 15 degrees Celsius. Nights at higher camps drop to zero or below. At altitudes above 3,500 metres, sub-zero nights are standard through the entire month and residual snow on high passes from the winter is still common in the first two weeks.
By late March, daytime temperatures at mid-elevation have risen into the 12 to 18 degree range. The shift is gradual but consistent. Lodges that were cold and quiet in early March are warming up, both literally and in terms of trail activity.
April is warmer across all elevations. Daytime temperatures at mid-elevation run 15 to 22 degrees Celsius. Nights remain cool above 3,000 metres but are no longer genuinely cold at lower elevations. High passes that held snow in March are generally clear by mid-April, and trail surfaces that were icy in the mornings are dry.
The practical implication: March demands a warmer sleeping bag, more layering, and a higher tolerance for cold mornings and evenings. April allows lighter packing and more comfortable resting conditions. For trekkers who feel the cold or are not experienced at altitude, April is the more physically comfortable month.
Rhododendron Season: The Visual Peak
Nepal’s rhododendron bloom is one of the most visually distinctive features of spring trekking. Nepal has over 30 rhododendron species, and the forests on routes through the Annapurna region, Langtang, and the approaches to Everest turn red, pink, and white during bloom season.
The bloom moves with altitude and temperature. At lower elevations, between 1,500 and 2,500 metres, rhododendrons peak in mid to late March. At higher elevations, between 2,500 and 3,500 metres, peak bloom arrives in April. Routes that pass through multiple elevation bands, such as the Annapurna Sanctuary Trek or the Gurung Villages to Annapurna Balcony Trek, catch both phases depending on timing.
For trekkers whose primary interest is the rhododendron forests, late March through mid-April is the window. A departure in late March catches the lower elevation bloom on the way in and the higher elevation bloom at mid-route. An April departure catches the upper elevation forests at their peak.
The Annapurna Sanctuary Trek and the Gurung Villages to Annapurna Balcony Trek both pass through significant rhododendron forest between 2,000 and 3,200 metres, making them the strongest options for bloom season trekking. The Solu Sherpa Village Trek and Tsum Valley Trek also pass through forested sections where rhododendrons feature, though the bloom is secondary to the cultural and remote landscape experience on those routes.
Visibility and Sky Conditions
March visibility is generally excellent. The air is dry, dust and haze have not yet built up, and the Himalayan panoramas are sharp. Morning clarity is particularly good. Afternoons in March can bring light cloud build-up, especially at lower elevations, but this clears overnight and has minimal effect on trekking days.
April visibility remains strong through the first half of the month. From mid-April onward, pre-monsoon atmospheric moisture begins to increase. Haze builds at lower elevations. Afternoon cloud develops more reliably, and on some days it moves higher before clearing. Views from altitude are still excellent in the mornings, but the all-day panoramic clarity of March starts to soften by the final week of April.
For photography and summit views, March and early April produce the sharpest conditions. Trekkers prioritising mountain views over bloom colour will find March marginally better on the visibility metric. Those willing to trade some afternoon haze for warmer temperatures and fuller bloom will find early to mid-April the right balance.
At the elevations involved in Glacier Safari Treks‘ departures, none of the routes reach technical alpine terrain where pre-monsoon cloud becomes a safety concern. The visibility difference between March and April is aesthetic rather than operational for these itineraries.
Trail Conditions and Crowd Levels
March trails are in good condition. Winter has consolidated the surface, there is minimal dust, and the post-winter trail clearing is complete on established routes. Crowd levels in early March are moderate. By late March, trail traffic increases as the season reaches full swing, particularly on the Annapurna Circuit approaches and the Everest region.
April trails are dry, well-maintained, and warm underfoot. Dust becomes a factor on lower elevation sections in the second half of the month, particularly on exposed ridgeline paths. Trail traffic in April is high on popular routes. Teahouses and lodges are busy, and booking ahead for peak April weeks is advisable.
For trekkers who prefer quieter trails and lodges, a March departure offers the experience with less competition for beds and a calmer atmosphere at rest stops. For trekkers who enjoy the social energy of a busy trail, the rhythm of April suits better.
The Tsum Valley Trek and Solu Sherpa Village Trek are restricted area routes that carry lower overall traffic regardless of month, making them good choices for trekkers who want spring conditions without the crowd levels of the main Annapurna or Everest corridors.
GST Spring 2025 Departures: March and April Side by Side
Glacier Safari Treks runs departures across three spring treks this season. Here is how the March and April dates compare for each route.
1. Solu Sherpa Village Trek, 10 Days
This route travels through the Sherpa heartland of the Solu Khumbu region, passing through forest and village terrain below the main Everest approaches. It is a cultural and landscape trek with moderate altitude. March departures on 23 Feb and 16 March catch cooler, clearer conditions with the lower-elevation rhododendron bloom. The April departure on 13 April benefits from warmer temperatures and the mid-elevation bloom. A final departure on 20 April is the warmest of the four.
2. Annapurna Sanctuary Trek, 11 Days
The Sanctuary is one of Nepal’s most celebrated routes, ascending through the Modi Khola valley into the amphitheatre formed by Annapurna I, Machapuchare, and the surrounding peaks. Rhododendron forest is dense and spectacular between 2,000 and 3,200 metres on this route. The March departure on 17 March catches the lower bloom and strong visibility at the Sanctuary. The 13 April departure hits the upper-elevation rhododendron peak. The 20 April departure is the warmest option with the fullest high-elevation bloom, though afternoon clouds may begin to feature by the final days.
3. Tsum Valley Trek, 10 Days
The Tsum Valley is a restricted, high-altitude cultural corridor north of the Manaslu range, leading into a Tibetan Buddhist enclave. Altitude on this route is significant, with upper valley elevations above 4,000 metres. March departures (17 Mar, 13 April) offer colder but clearer conditions. The April departure on 20 April provides warmer temperatures at lower elevations while the upper valley remains cool throughout. Acclimatisation on this route is non-negotiable regardless of month.
Choosing Your Window
The decision between March and April comes down to four variables: temperature preference, bloom priority, visibility priority, and trail crowd tolerance.
Choose March if you want to run warm, prioritise sharp mountain views, prefer quieter trails, and are comfortable with cold mornings and evenings at altitude.
Choose April if you want to feel the cold, want the fullest rhododendron bloom at mid to upper elevations, do not mind busier trails, and want the most comfortable sleeping and resting conditions on the route.
For routes with significant altitude gain, such as Tsum Valley and Langtang Gosaikund, the temperature difference between March and April is more pronounced and the case for April is stronger for trekkers without extensive high-altitude cold weather experience.
For the Annapurna Sanctuary and Gurung Villages treks, both months are strong and the choice is largely personal. The bloom peaks slightly later on those routes, giving April a marginal edge for colour, while March holds the edge for visibility and crowd levels.
Glacier Safari Treks can advise on the departure that best matches your priorities. The dates across all five routes are available now and spring fills quickly.