Kosaka has several festivals throughout the year. The most popular being the Acacia and Tanabata festivals.
Acacia Festival (second weekend of June) – The Acacia festival takes place in Kosaka Central Park. It began in the mid 1900′s when an abundant amount of acacia trees were planted to restore the local flora and fauna that was destroyed by the exhaust from the then-active mining refinery. The festival includes various food booths, games for children, taiko drumming and numerous other musical and artistic performances.
Tanabata Festival (Early August) – The Kosaka Tanabata festival consists of elaborate handmade floats constructed by crews representing each neighborhood. The floats are pulled through town to singing and drumming and put on display to be judged at the end of the festival.
Winter Festival (Early February) – The Fuyu-monogatari festival (冬物語祭り、lit. “Winter’s Tale Festival”) located on the shores of Lake Towada, is a popular event for winter travelers and locals. Despite the cold temperatures, on display are Japanese igloos, snow lanterns, fireworks, an outdoor foot bath (onsen), food booths, local wines and various performances.