Idaho’s Mammoth Cave Is Open for the 2026 Season! The Shoshone Ice Cave Is Temporarily Closed
Idaho’s Mammoth Cave near Shoshone, Idaho, is open daily May 1 through September 29 for the 2026 season and is one of the largest volcanic lava tubes open to the public in the United States. The nearby Shoshone Ice Cave is temporarily closed for the entire 2026 season while walkway repairs and replacement are completed.…