How Crowded Is Antietam National Battlefield in December?

December runs about 0.7× Antietam National Battlefield's average month, which makes it a quiet month here — roughly 6% of the park's yearly visitors come in December.

In a typical December the park sees about 13,000 recreation visits, based on National Park Service monthly counts from 1979 to 2025.

That makes December the 9th-busiest of the park's twelve months, sitting between the July peak (2×) and the January low (0.2×).

On our Best Time to Visit score December rates 35/100 ("Poor"), versus the top-rated September at 62/100 — pleasant weather with noticeably thinner crowds (shoulder season).

Typical December weather, from 1991–2020 NOAA climate normals at the nearest station, averages a daytime high near 45°F and an overnight low around 25°F, with about 3.5" of precipitation.

That average of about 35°F is cool, so layers and a shorter daylight window matter.

Because June, July and August together draw about 39% of annual visitors, choosing December instead steps outside that summer crush — the single biggest lever on how crowded the park feels.

You'll have about 9.2 hours of daylight in December to explore — near the year-round minimum.

Park-wide, 2024 drew 197,340 recreation visits, up 28.5% from 153,560 in 2023.

Across the past decade overall visitation has eased about 60.5%, so December may feel a touch quieter than it once did.