When: Late January to March. During the Shikaribetsuko-Kotan Festival
Where: Lake Shikaribetsu
Area: Kitaurimaku, Shikaoi, Kato District, Hokkaido 081-0344
URL: http://www.shikaoi.net/contents/eventschedule/
GPS: 43.272343755382714, 143.106119184289
Lake Shikaribetsu Kotan runs from late January to late March, depending on the yearly weather patterns (reservation required).
A free bus service to Lake Shikaribetsu Kotan departs from JR Obihiro Station and JR Shintoku Station. The bus ride from Obihiro Station takes 1 hour 40 minutes to get to Shikaoi and Lake Shikaribetsu, so plan accordingly.