How Crowded Is Buck Island Reef National Monument in September?

September runs about 0.4× Buck Island Reef National Monument's average month, which makes it a very quiet month here — roughly 3% of the park's yearly visitors come in September.

In a typical September the park sees roughly 1,100 recreation visits, based on National Park Service monthly counts from 1979 to 2025.

It is the quietest month of the year at Buck Island Reef; by contrast March, the busiest, runs about 1.5× the average — so September is the easiest time to have the place largely to yourself.

On our Best Time to Visit score September rates 87/100 ("Excellent") — the single best-rated month at Buck Island Reef, balancing crowds against daylight.

Because June, July and August together draw about 28% of annual visitors, choosing September instead steps outside that summer crush — the single biggest lever on how crowded the park feels.

You'll have about 12.1 hours of daylight in September to explore — between the 10.9-hour midwinter low and the 13.1-hour summer high.

Park-wide, 2025 drew 40,079 recreation visits, down 5.2% from 42,289 in 2024.

Across the past decade overall visitation has risen about 40.3%, so a September visit is likely to feel busier than it did a few years ago.