The park's mixed grass prairie is one of the few remaining and is home to native wildlife such as bison , elk , pronghorn , mule deer , coyotes , and prairie dogs . Seven miles north of Hot Springs, SD , on U.S. Route 385. Park open year-round. Visitor center open daily except Thanksgiving and Christmas Days. Spring and fall weather are the most variable with cool, damp days alternating with dry, warm ones.
Summers are generally sunny, hot, and dry.
Winters are generally mild with little snow, but occasional sub-zero temperatures can be expected. Dress appropriately for the season. Persons touring the cave should wear low-heeled walking shoes with nonskid soles and a lightweight jacket or sweater. At Rapid City, SD, exit onto U.S. Route 79 south. Follow Route 79 south approximately 50 miles to U.S. Route 18.