Mammoth Cave in December: Crowds, Weather & What to Pack

Shoulder · VisitWhen score 63/100 · #8 of 12 months

December is a solid shoulder-season month to visit Mammoth Cave National Park: crowds run 29% of the July peak (28,745 average visits), days average 51°F with 9.6 hours of daylight. Computed from NPS and NOAA data.

Crowds in December

Mammoth Cave averages 28,745 recreation visits in December — 29% of what July, the peak month, draws — the third-quietest month of the year. Trailheads and parking fill accordingly.

Weather & daylight

Days are cool (highs average 51°F), and mornings are chilly (lows average 33°F). This is one of the wetter months (4.8″ of precipitation on average). Mid-month daylight runs 9.6 hours.

NOAA 1991–2020 monthly normals, station MAMMOTH CAVE, KY US (4 mi from park coordinates, 760 ft elevation) — conditions vary inside the park, especially with elevation. Daylight computed for the 15th of December.

What to pack for Mammoth Cave in December

Computed from the month's weather normals above — not a generic list.

• Warm mid-layer (fleece or light puffy) — mornings average 33°F
• Rain shell + pack cover — 4.8″ of precipitation is normal this month
• Headlamp — only 9.6 hours of daylight in mid-December
• Sturdy broken-in footwear, navigation and a basic first-aid kit — every park, every month

If your dates are flexible, consider shifting: The computed best months for Mammoth Cave are January and February.

Common questions

See also: the best national parks to visit in December · Last verified 2026-07-16