How Crowded Is Indiana Dunes National Park in May?

May runs about 1.1× Indiana Dunes National Park's average month, which makes it an average month here — roughly 9% of the park's yearly visitors come in May.

In a typical May the park sees about 222,000 recreation visits, based on National Park Service monthly counts from 1979 to 2025.

That makes May the 5th-busiest of the park's twelve months, sitting between the July peak (2.2×) and the January low (0.4×).

On our Best Time to Visit score May rates 65/100 ("Good") — the single best-rated month at Indiana Dunes, balancing crowds against weather and daylight.

Typical May weather, from 1991–2020 NOAA climate normals at the nearest station, averages a daytime high near 68°F and an overnight low around 50°F, with about 4.3" of precipitation.

That average of about 59°F is a comfortable range for hiking and being outdoors all day.

Because June, July and August together draw about 49% of annual visitors, choosing May instead steps outside that summer crush — the single biggest lever on how crowded the park feels.

You'll have about 14.3 hours of daylight in May to explore — between the 9-hour midwinter low and the 15-hour summer high.

Park-wide, 2025 drew 2,629,497 recreation visits, down 2.8% from 2,705,209 in 2024.

Across the past decade overall visitation has risen about 40.6%, so a May visit is likely to feel busier than it did a few years ago.