What is Bitter Root Day? Bitter Root Day is a festival centered on our state flower, the Bitter Root, and the Salish People. The Ravalli County Museum’s Annual Bitter Root Day Festival features arts, crafts and food vendors, live music, and a celebration of both the Bitterroot plant and the Salish People. We always invite members of the Salish Tribe to join us and share their cultural heritage with us through authentic Salish drumming and dancing.