The official opening and closing dates for Happo One, Nagano for current and past seasons. These dates are subject to change at Happo One's discretion based on weather and snowfall. Estimated dates are based on historical averages or advice from the resort.
| Season |
Opening |
Closing |
| Dates |
| 24/25 |
12/03/2024 (estimated) |
05/06/2025 (estimated) |
| 23/24 |
11/30/2023 |
05/06/2024 |
| 22/23 |
12/10/2022 |
04/30/2023 |
| 21/22 |
11/26/2021 |
05/08/2022 |
| 20/21 |
12/15/2020 |
05/09/2021 |
| 19/20 |
12/13/2019 (estimated) |
04/08/2020 |
| 18/19 |
12/06/2019 |
05/05/2020 |
| 17/18 |
11/21/2017 |
05/06/2018 |
| 16/17 |
12/08/2016 |
05/07/2017 |
| 15/16 |
11/28/2015 |
05/03/2016 |
| 14/15 |
12/14/2014 |
05/10/2015 |
