There is no single season.
Ask when to climb in Sichuan and the honest answer is a list, not a date. Each of the seven routes we guide prints its own season window on its own page, and the windows differ — not by marketing accident, but because each mountain’s conditions dictate them. The Erfeng page says it without decoration: its window runs 25 May to 25 October because that is when the mountain’s snow conditions suit a guided ascent. Outside the window, we do not guide it. That is the whole policy.
The seven windows.
| Route | Window | Days |
|---|---|---|
| Yamu, 5,374 m | 20 May – 26 Nov | 5 |
| Erfeng, 5,276 m | 25 May – 25 Oct | 5 |
| Reddomain, 6,112 m | 1 Jun – 26 Oct | 13 |
| Jinyin, 6,410 m | 1 Jun – 26 Oct | 10 |
| Zhongshan, 6,886 m | 1 Jun – 26 Oct | 14 |
| Wukuchu, 5,518 m | 10 Jun – 26 Oct | 6 |
| Nama, 5,588 m | 10 Jun – 26 Oct | 6 |
How to read the dates.
A pattern is visible in the list, and it is a conditions pattern, not a convenience one. The two five-day snow peaks open first — Yamu from 20 May, Erfeng from 25 May — because their summit slopes are first into shape. The three big objectives — Reddomain, Jinyin, Zhongshan — open at the start of June, once the faces and glaciers carry the season’s working snow. And Wukuchu and Nama wait longest of the mid-sized routes, opening 10 June, because their glacier and higher snow ground is the last to settle into guided condition.
The closing dates are even more uniform: everything ends 25 or 26 October — except Yamu, whose window runs a further month, to 26 November. If your travel calendar pushes into deep autumn or early winter, Yamu is the rung that stays open.
Picking your week.
Because every climbing route runs private, a window is not a departure calendar — it is the range inside which you pick your own dates, as explained in how a private expedition works. Two practical notes. First, the long routes build their own weather margin: Reddomain and Zhongshan carry flexible days at the end precisely so a storm week does not end the trip. Second, dates near the national holidays are the crowded ones on the approaches — the general timing pieces on how the holiday calendar moves the country and the quiet months apply to the valleys below the mountains just as they do to the treks.
For the wider seasonal picture across China — which region rewards which month — start with There is no single best month for China, and for the Kham high country specifically, the Kham season calendar.
Pick a window?
The Yamu expedition: open to late November
The Erfeng expedition: the first window of the season
The Kham season calendar
There is no single best month for China