The best time to hike the Ausangate Trek is the Andean dry season from May to September, when skies are clear, trails are firm and the high passes are snow-free. Nights still drop below −10 °C at the 4,500–4,800 m camps even in the dry months. Avoid the December–March wet season, when rain, snow and cloud make the 5,200 m passes hazardous.
What is the best month to hike the Ausangate Trek?
June, July and August are the prime months on the Ausangate Trek. These are the heart of the Andean dry season, delivering near-guaranteed clear skies, stable trail conditions and the sharpest views of the 6,384 m Nevado Ausangate and its turquoise lakes. The trade-off is cold: this is also Andean winter, so overnight temperatures at the high camps are at their lowest, regularly between −10 and −15 °C. Clear days and frigid nights are the signature of peak season here.
May and September are excellent shoulder months for 2026. You keep most of the dry-season stability with marginally warmer nights and fewer hikers on the Rainbow Mountain section, which sees heavy day-tripper traffic in July and August.
Ausangate weather by season
| Season | Months | Conditions | Night temps |
|---|---|---|---|
| Dry / peak | Jun–Aug | Clear, stable, cold | −10 to −15 °C |
| Shoulder | May, Sep | Mostly dry, fewer crowds | −5 to −10 °C |
| Transition | Apr, Oct | Variable, some rain | −3 to −8 °C |
| Wet | Dec–Mar | Rain, snow, cloud | −2 to −6 °C |
Note the inversion that surprises many hikers: the warmest nights fall in the wet season, but the rain, snow on the passes and constant cloud make those months the worst for actually completing the circuit safely.
Why avoid the Ausangate Trek in the wet season?
From December to March the Andes around Cusco enter their rainy season. On Ausangate this means snow accumulating on the 5,200 m Palomani Pass, slick and muddy trail at the camps, and cloud that hides the very peaks and lakes you came to see. River crossings swell and the risk of being turned back at a snowed-in pass rises sharply. Unless you are an experienced winter trekker with a guide who knows current conditions, the wet season is not the time for this route. The protected-area authority, SERNANP, publishes regional access information worth checking before you commit.
How does altitude affect timing on Ausangate?
The dry season is preferred partly because clear, stable weather is safer at the altitude where Ausangate operates: passes near 5,200 m and camps at 4,500–4,800 m. At those heights the air holds barely over half the oxygen of sea level, so adding bad weather to thin air compounds the risk. Spend at least two or three days acclimatising in Cusco (3,400 m) before the trek regardless of month, and read our high-altitude training and acclimatisation guide for the preparation that matters most. The Wilderness Medical Society's altitude guidance, summarised by the World Health Organization, recommends a slow ascent profile that the dry season makes easier to follow.
What to pack for the Ausangate season
Because peak season pairs warm days with sub-zero nights, your kit must span a wide range. A four-season-capable down bag and a warm insulated jacket handle the −15 °C camps, while sun protection matters during the day, when high-altitude UV is intense. Carry layers, water and your camera in a tough 35–50 L daypack such as the Patagonia Ascensionist 35L or the lightweight Zpacks Arc Scout 37L while pack horses carry the heavier camping gear. Trekkers who carry their own full load should step up to a Osprey Atmos AG 65. For the full kit breakdown, see our Ausangate Trek packing list, and for an alternative if you want a warmer-weather Peru option, the Lost City Walking Track in Colombia runs in the same Dec–March window when Ausangate is wet.
How do crowds and the Rainbow Mountain affect timing?
The one busy point on the otherwise empty Ausangate Trek is Vinicunca, the Rainbow Mountain at 5,036 m, which draws thousands of day-trippers bused in from Cusco during the July–August peak. If your circuit passes it late morning you share the colourful ridge with crowds; reach it at first light, before the day tours arrive around 9 a.m., and you often have it nearly to yourself. Choosing May or September sidesteps the worst of this, keeping the dry-season weather while thinning the Rainbow Mountain queues considerably.
Local festivals also shape the calendar. The Quyllurit'i pilgrimage, held at the foot of Ausangate in late May or early June, fills the lower valleys with tens of thousands of pilgrims for several days; it is a remarkable cultural event but worth planning around if you want solitude. Outside that window, the high circuit stays quiet all season. Whenever you go, pack for the cold nights with a warm sleep system and carry your daily layers in a light, well-fitted pack such as the Zpacks Arc Scout 37L, and read our Ausangate packing list to match your kit to the season you pick. Regional access and any closures are published by Peru's national protected-areas service, SERNANP.
Frequently Asked Questions
How cold does the Ausangate Trek get at night?
At the high camps between 4,500 and 4,800 m, overnight temperatures fall to −10 to −15 °C during the peak dry season of June to August. Even shoulder months see frost. A sleeping bag rated to at least −12 °C comfort, plus an insulated jacket and warm sleep socks, is essential year-round on this route.
Can you hike Ausangate in the rainy season?
It is possible but risky and not recommended. From December to March, snow on the 5,200 m Palomani Pass and persistent cloud can block the route and erase the views. Only experienced trekkers with a guide monitoring conditions should attempt it, and even then turn-backs at snowed-in passes are common.
How many days do you need for the Ausangate Trek?
The classic circuit takes 5 to 6 days to cover roughly 70 km, plus two or three acclimatisation days in Cusco beforehand. Shorter 4-day versions exist but compress the altitude gain uncomfortably. Budget at least a week in the Cusco region in total to trek safely.
Is May a good time to hike Ausangate?
Yes, May is one of the best months. It opens the dry season with stable, mostly clear weather and slightly warmer nights than the June–August peak, while drawing fewer crowds on the Rainbow Mountain section. It is an ideal shoulder-season choice for 2026.
What is the weather like on the Ausangate Trek in July?
July sits in the heart of the dry season and delivers the most reliable conditions of the year: clear blue skies, sharp views of the 6,384 m Nevado Ausangate, and firm, snow-free trails on the passes. The trade-off is cold, because July is also Andean midwinter. Daytime walking in sun is pleasant at around 10–15 °C, but nights at the 4,500–4,800 m camps fall to −10 to −15 °C, so a warm sleeping bag and insulated jacket are essential. Rain is rare in July, making it the safest month for crossing the 5,200 m Palomani Pass. Strong daytime sun also means high UV exposure at altitude, so factor 50 SPF sun cream and category 4 sunglasses into even a cold July itinerary.