National Parks near Iron Mountain Trail, Custer County, South Dakota Iron Mountain Trail Main Page HIGH QUALITY TOPO MAP, CLICK HERE More Information about Iron Mountain Trail, Custer County, South Dakota Nearest metro area is Spearfish, South Dakota Click here for more outdoors activities near Spearfish, South Dakota General Camping Information List of nearby National Parks: Mount Rushmore National Memorial, Keystone - SD, 7.4 miles away Jewel Cave National Monument, Custer - SD, 11.6 miles away Wind Cave National Park, Hot Springs - SD, 20.7 miles away Agate Fossil Beds National Monument, Harrison - NE, 64.3 miles away Scotts Bluff National Monument, Gering - NE, 103.5 miles away * Distances listed are direct linear distances, actual travel distance may be different. Go to South Dakota Outdoors Index