Spring (April and May) and autumn (September and October) are the best seasons for visiting Simatai. The views are clearest in autumn when the air is dry and the mountain foliage turns gold and red, and the temperatures are comfortable for the steep climb. Spring is also excellent, with wildflowers on the hillsides and fewer visitors than the national holiday periods.
Avoid the National Day holiday (first week of October) and Chinese New Year, when even the capped visitor numbers at Simatai feel crowded and the access roads back up. Summer visits are possible but the heat on the exposed stone ridges can be brutal by midday — start early if you go in July or August. Winter is cold but the wall under snow is genuinely beautiful, and visitor numbers drop sharply; check in advance that Simatai is open, as it sometimes closes for maintenance in the off-season.
The night visit program runs on weekends and select evenings — book in advance through the Simatai or Gubei Water Town booking systems.