Keystone Resort Closing Date 2025 Season. 2, keystone resort announced that it will also be opening on saturday. Arapahoe basin ski area and keystone resort in summit county, colorado announced they will open for the 2025/25 winter season on saturday, nov.

Keystone resort ended the season with a splash on sunday, april 7, marking the first ski resort to close in summit county. Keystone ski resort closing day: