There are 3 main types of festivals in Harvest Moon: Friends of Mineral Town and Harvest Moon: More Friends of Mineral Town: Competition, Community, and Animal. Some festivals like the Horse and Dog festivals fall into more than one category. There are festivals in every season.
In Spring, the festivals are: The New Year Festival, the Spring Thanksgiving, the Spring Horse Racing Festival, and the Cooking Competition.
In Summer, the festivals are: The Chicken Festival, the Cow Festival, and the Fireworks Festival.
In Autumn, the festivals are: The Music Festival, the Harvest Festival, the Full Moon Festival, the Fall Horse Racing Festival, the Sheep Festival, and the Pumpkin Festival.
In Winter, the festivals are: The Winter Thanksgiving Festival, the Starry Night Festival, End of year Noodles, and the Beginning of Year Sunrise Festivals.