The best time to visit Mammoth Cave is generally April, May, September and October. It is a national park in Kentucky.
April, May, September and October tend to bring the best balance of weather, access and conditions. Around then, daytime highs average about 81°F and overnight lows near 62°F.
Kentucky has a moderate climate with warm, yet moist conditions. Summers average in the high 80s; winters average in the low 40s. Southern Kentucky, where Mammoth Cave is located, receives the highest average precipitation for the state, about 50 inches per year, mostly in spring. Winter can bring mild to moderate snow and ice. Storms happen year-round, and can include tornadoes and flooding in low-lying areas, but severe weather is infrequent. The temperature deep in the cave is a constant 54°F (12°C).
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