Mammoth Cave
The longest known cave system on Earth, at more than 420 miles and counting.
1 national park in Kentucky
Kentucky's National Park
Kentucky is home to Mammoth Cave National Park. The longest known cave system on Earth, at more than 420 miles and counting.
The best time to visit Mammoth Cave National Park is March–May and October–November. For great conditions with fewer people, aim for November. It's busiest in June through August.
About the park
Nearby parks in other states
Great Smoky Mountains
Tennessee & North Carolina · Best Apr–Jun, Sep–Oct
Gateway Arch
Missouri · Best Mar–May, Sep–Nov
New River Gorge
West Virginia · Best May–Oct
Indiana Dunes
Indiana · Best Jul–Sep
Questions
How many national parks are in Kentucky?
Kentucky has 1 national park: Mammoth Cave National Park.
When is the best time to visit national parks in Kentucky?
The best time to visit Mammoth Cave National Park is March–May and October–November. For great conditions with fewer people, aim for November. It's busiest in June through August.
Last reviewed October 4, 2026. Ratings are editorial. Rules and road openings change each year, so confirm on the official NPS site before you go.