Get ready for a spook-tacular day of family fun! Boo Fest returns to Six Flags St. Louis, filled with festive decorations, kid-friendly activities, seasonal treats, live entertainment and your favorite family rides. From trick-or-treating and costume fun to exciting shows and fall-themed surprises, Boo Fest is the perfect way for families to celebrate the Halloween season together. Enjoy plenty of festive fun around every corner and make magical Halloween memories all day long.