Gassan is Japan's only summer ski area, open April to July. 4 runs, 3 lifts and 900 m vertical. Snow depth and the 7-day forecast in one place.
The longest run is about 5 km. An adult day ticket is around ¥5,800 (check the resort for current prices).
Snow depth and the 7-day snowfall and temperature forecast for Gassan Ski Area come from observations and forecast models for its part of Yamagata.