The dates shown represent the first and last recorded operating days for ski areas in Japan during the 2025–2026 season. The Number of days is calculated from these dates and may not reflect the actual number of days of operation, as some ski areas operate only on selected dates, close temporarily due to weather, or close for periods during the main winter season.

​Early- and late-season operations are often limited, and the earliest openings rely on artificial snowmaking.

​Ski areas are included only where both opening and closing dates could be confirmed after extensive checking; any ski areas with missing data were excluded.