17sepAll Day19Halloween Spooktacular Weekend 1It's Halloween at Jellystone Park, and activities will include loads of fun and plenty of scares! Join us for arts and crafts and activities, pumpkin carving, costume contest, and campsite/cabin decorating contest! Our campers are known for competitive decorating, outdoor cooking, and having a good time. Prizes awarded for first-fifth places in campsite/cabin contests. Don't forget candy (approx. 450-500 kids)!