Castle Day in Japan
Castle Day in Japan is held on April 6. Shiro No Hi. This event in the first decade of the month April is annual. 
Help us
Help us 
This one’s easy: 4 (shi) and 6 (ro) makes up the Japanese word for castle, shiro. Put it on your Japan-to-do list to visit one of the country’s beautiful castles on that day every year.
Similar holidays and events, festivals and interesting facts
International Aircraft Carrier Day on April 3
Hana Matsuri in Japan on April 8
The first day of Takayama Spring Festival on April 14 (Takayama, Gifu, Japan);
Black Day on April 14 (South Korea, Japan, Taiwan. An unofficial holiday celebrated annually by single people - unmarried or unmarried people);
Portfolio Day in April on April 14
National Anime Day in Japan on April 15
Children's Day in Japan on April 17