The best time for the Annapurna Circuit trek is October and November, followed closely by March and April — the two windows when Thorong La Pass at 5,416m sees the most stable weather of the year. Season matters more on this route than on most Nepal treks, because the itinerary crosses one of the highest trekking passes in the country and moves through six climate zones in 15 days. Get the timing right and the circuit delivers clear mountain views from Besisahar to Poon Hill. Get it wrong and you’re looking at a closed pass, a flooded lower trail, or a bitterly cold crossing with real risk attached. This guide walks through every month honestly, including what the rain shadow beyond Manang actually means for your trip.
What’s Inside This Guide
- Best Time — Quick Answer
- Month-by-Month Season Guide
- Thorong La Weather Windows
- Spring vs Autumn — Which Is Better
- The Rain Shadow — Why the Upper Circuit Differs
- Best Time If You Add Tilicho Lake
- Months to Avoid
- Frequently Asked Questions
- Related Planning Guides
Best Time for the Annapurna Circuit Trek — Quick Answer
| Season | Months | Rating | Why |
|---|---|---|---|
| Post-monsoon autumn | October, November | ⭐⭐⭐⭐ Best | Clearest skies of the year, stable Thorong La conditions, but the busiest season |
| Spring | March, April | ⭐⭐⭐⭐ Excellent | Rhododendron forests in bloom on the Ghorepani section, generally stable weather, fewer crowds than autumn |
| Late spring | May | ⭐⭐⭐ Good with caveats | Warmer, hazier views, pre-monsoon cloud starts building by late month |
| Early autumn | September | ⭐⭐⭐ Good with caveats | Monsoon tapering off, lower trail can still be wet, upper circuit often clearer |
| Winter | December–February | ⭐⭐ Only for experienced cold-weather trekkers | Thorong La sees real snow, quieter trails, genuine pass-closure risk without the right preparation |
| Monsoon | June–August | ⭐ Not recommended | Heavy rain and leeches on the lower trail, obscured views, landslide risk on the access road |
Why October and November lead the list
The monsoon clears out by late September, leaving October and November with the driest air and the most consistent visibility of the year. Thorong La sees its most predictable weather window in this period, and the rhododendron forests below Ghorepani have given way to clear autumn light by the time trekkers reach Poon Hill. The trade-off is crowds — this is peak season, and popular teahouses at Manang and Thorong Phedi fill up fast. Mountain Hike Nepal pre-books accommodation specifically to avoid the arrival-day scramble this creates.
Annapurna Circuit Trek — Month-by-Month Season Guide
| Month | Conditions | Thorong La | Trail Crowds |
|---|---|---|---|
| January | Coldest month — Manang and above regularly below -10°C at night | Snow common, closure possible after storms | Very quiet |
| February | Still cold, slowly warming — winter gear essential above Manang | Snow still likely, check conditions before departure | Very quiet |
| March | Spring begins — lower rhododendron forests start flowering | Improving, still cold at dawn | Moderate, building toward peak |
| April | Peak spring — rhododendrons in full bloom on the Ghorepani section | Generally stable | Busy |
| May | Warm, increasingly hazy as pre-monsoon humidity builds | Stable early month, cloudier by late May | Moderate, tapering off |
| June | Monsoon arrives — rain increases on the lower and mid circuit | Accessible but views often clouded | Quiet |
| July | Peak monsoon — heavy rain on the Marsyangdi valley side | Accessible, high cloud cover | Very quiet |
| August | Monsoon continues on the eastern side — the Mustang side stays drier | Accessible, variable visibility | Very quiet |
| September | Monsoon tapering — lower trail still wet early month, clearing by late September | Improving through the month | Building |
| October | Clearest month of the year — the classic Annapurna Circuit month | Most stable window of the year | Peak season — busiest month |
| November | Still excellent, air clearing further, temperatures dropping | Stable, colder mornings | Very busy, especially early month |
| December | Early winter — cold but often still trekkable with the right gear | First real snow risk of the season | Quiet |
Thorong La Weather Windows — What Actually Matters
Thorong La is the one point on the circuit where season really decides whether the day goes smoothly or turns dangerous. At 5,416m, the pass sits well above the altitude where weather changes fast and without much warning, so the timing of your crossing matters more than almost any other planning decision on the trip.
The stable window: October to mid-November
This is when Thorong La crossings run most predictably — clear pre-dawn starts, manageable wind, and a low chance of the pass closing on you mid-itinerary. It’s still worth remembering that even in this window, mountain weather isn’t guaranteed. An early-season snowstorm in October 2014 killed 43 people across the wider Annapurna region, a stark reminder that peak-season conditions reduce risk but never eliminate it entirely. Mountain Hike Nepal guides monitor forecasts daily during the approach to Thorong Phedi and will hold a group back rather than push into deteriorating conditions.
Winter crossings: December through February
Thorong La can and does close for days at a time in deep winter after heavy snowfall. Crossings are still possible with the right cold-weather experience, proper gear, and flexibility in your schedule to wait out a storm if needed. This isn’t the season for a first Himalayan trek or for anyone without real cold-weather background — the margin for error narrows considerably once snow depth builds on the upper approach.
Spring vs Autumn — Which Season Is Actually Better
Both seasons deliver a strong circuit experience, and the honest answer is that the choice comes down to what you’d rather trade off.
| Factor | Autumn (Oct–Nov) | Spring (Mar–Apr) |
|---|---|---|
| Mountain visibility | Clearest of the year | Very good, occasionally hazier by late April |
| Temperature | Cooler, especially at night | Milder on the lower circuit, still cold at Thorong Phedi |
| Crowds | Busiest season on the circuit | Busy but noticeably less than autumn |
| Scenery bonus | Post-monsoon greenery on the lower trail | Rhododendron forests in bloom below Ghorepani |
| Teahouse availability | Requires pre-booking at Manang and Thorong Phedi | Easier to secure rooms without advance booking |
If clear mountain photography is the priority, autumn wins narrowly. If you’d rather trek with fewer people on the trail and don’t mind occasional afternoon haze, spring is the better call — and the rhododendron forests on the Ghorepani to Poon Hill section are a true seasonal highlight that autumn simply doesn’t offer.
The Rain Shadow — Why the Upper Circuit Differs From EBC or Langtang
One thing that surprises trekkers researching monsoon-season options: the Annapurna Circuit isn’t uniformly wet from June to August. Once the trail crosses Thorong La into the Kali Gandaki valley, it enters the rain shadow behind the Annapurna and Dhaulagiri massifs, where the Mustang side receives dramatically less monsoon rainfall than the Marsyangdi valley side. This is the same effect that makes Upper Mustang trekkable almost year-round.
That doesn’t make the full circuit a good monsoon choice — the Besisahar to Manang side still gets heavy rain, leeches, and landslide-prone road sections during peak monsoon, and Thorong La itself can see cloud cover regardless of which side you’re approaching from. But it’s worth knowing this geography exists, since it’s meaningfully different from EBC or Langtang, where monsoon conditions affect the entire route fairly evenly.
Best Time If You Add Tilicho Lake
The same October–November and March–April windows apply to the Tilicho Lake extension, but season matters slightly more here than on the standard circuit. The approach to Tilicho Base Camp crosses a section prone to landslides, and that terrain is more exposed to whatever weather is happening on a given day than the more sheltered main circuit trail. Avoid the monsoon months entirely if you’re adding Tilicho — June through August raises the landslide risk on that specific section beyond what’s reasonable, more so than it does on the standard route.
Winter is also a harder call for Tilicho specifically. Two nights above 4,000m at Base Camp, plus the summit push to 4,919m, both become considerably more demanding in deep winter conditions than the equivalent altitude exposure on the standard circuit. October and November remain the strongest choice for this route. See the Annapurna Circuit with Tilicho Lake package →
Months to Avoid — Being Honest About It
Peak monsoon: July and the first half of August
This is the least rewarding window for the circuit. Heavy rain on the Marsyangdi side brings leeches, slippery trail conditions, and a real risk of landslides affecting the Besisahar to Chame road. Mountain views are frequently obscured by cloud even when the trail itself is passable. It’s not dangerous with a good guide, but it’s simply the wrong season if photography or clear Himalayan views are part of why you’re going.
Deep winter without cold-weather experience: January
January is the coldest month on the circuit and carries the highest chance of a multi-day Thorong La closure after snowfall. This isn’t a season to rule out entirely, but it’s a poor choice for a first Himalayan trek, and it demands proper cold-weather gear and real schedule flexibility in case the pass closes while you’re at Thorong Phedi.
Frequently Asked Questions
October, followed closely by November. Both sit in the post-monsoon window with the clearest skies and the most stable Thorong La conditions of the year. The trade-off is that October is also the busiest month on the entire circuit, so teahouses at Manang and Thorong Phedi fill up fast — Mountain Hike Nepal pre-books accommodation to avoid the arrival-day scramble this creates.
Yes, but only with real cold-weather experience and proper gear. December is often still manageable, while January and February carry a real risk of Thorong La closing for days after heavy snowfall. Winter isn’t the right choice for a first Himalayan trek or for anyone without cold-weather background — it demands schedule flexibility in case the pass closes while you’re at Thorong Phedi.
Technically yes, but it’s not recommended. June through August brings heavy rain, leeches, and landslide risk to the Besisahar to Chame side of the circuit, with mountain views frequently obscured by cloud. The Mustang side beyond Thorong La sits in a rain shadow and stays noticeably drier, but that doesn’t offset the conditions on the approach. Trekkers set on a monsoon-season Nepal trip are better served by a route that sits entirely within the rain shadow, like Upper Mustang.
Related Planning Guides
- Annapurna Circuit Package — Full 15-day expedition from USD 828 per person
- Annapurna Circuit with Tilicho Lake Package — Dedicated 13-day route from USD 778 per person
- How Hard Is the Circuit? — Full difficulty guide including Thorong La
- Day-by-Day Itinerary — Every stage with altitude and trail detail
- Altitude Sickness Guide — AMS prevention for a 5,416m pass crossing
- Packing List — Gear that changes by season
- Circuit Cost 2026 — Full budget breakdown
- Permits Guide 2026 — ACAP and TIMS costs, checkpoint locations
Pick the Window. Cross the Pass Right.
The best time for the Annapurna Circuit trek comes down to what you’re willing to trade — October and November for the clearest skies and the busiest trail, March and April for blooming rhododendrons and a quieter circuit, or a well-prepared winter departure if cold-weather trekking is already familiar territory. What doesn’t change across any of these windows is the value of a guide who checks the forecast every morning and makes the call on Thorong La based on actual conditions, not the calendar.
Mountain Hike Nepal has guided the Annapurna Circuit since 2018 as a licensed local operator in Kathmandu. When you contact us, you speak directly with the team that tracks Thorong La conditions every season, so any question about timing, current weather patterns, or which month suits your travel dates gets a straight answer.
The full package starts at USD 828 per person for groups of 8–12, USD 898 for 5–7, USD 998 for 2–4, and USD 1,198 for solo trekkers. All permits and transport included.
View the full Annapurna Circuit Trek package →
Questions about timing, current trail conditions, or which season fits your travel dates? We respond within 12 hours and give straight answers.