Minnetonka Cave is the largest limestone rock cave in the state of Idaho. It is located in Caribou-Targhee National Forest in Bear Lake County, Idaho, United States, above the village of St. Charles (located at the north end of Bear Lake). Tours through the cave are offered from Memorial Day (weather permitting) through Labor Day by Scenic Canyons Recreational Services, the concessionaire that holds the special use permit from the United States Forest Service.