The Shiraito Falls are located in Karuizawa on the Nagona side. Karuizawa straddles both Nagano and Gunma prefectures. The falls are lit up during select periods in winter. The first of those illumination periods is called the "Christmas session". The falls will be lit up between 5 and 7 pm on the weekends between December 12th and December 20th and from December 24th to December 27th.
After the Christmas Session, there will be a New Year Session and a Valentine's Day Session.
Please note, there are no buses running to this event. They request that you come by car or taxi. Also, while the attraction and the event are free, you have to pay a charge for using the Shiraito Highland Way toll road. The Shiraito Highland Way is a scenic route through a lush forest. It connects old Karuizawa with Mount Asama. The featured photo is one segment of the road during daytime hours.