Mueller State Park is open year round. With its wealth of aspen trees, each season is a delight for photographers and sightseers visiting the park. Over fifty miles of scenic trails invite you to explore the park's rare beauty. Hiking, camping, mountain biking, horseback riding, snow shoeing, cross country skiing and nature study are the park's main attractions. Mueller's 5,121 acres of aspen and conifer forests are home to an abundance of wildlife including black bear, elk, deer, fox, coyotes, & hawks. 132 campsites in seven loops include 110 electrical sites accommodating motor homes, trailers and tents, and 22 walk-in tent only sites.