Best Time to Visit George Rogers Clark

George Rogers Clark National Historical Park is a National Historical Park in IN and a relatively quiet park, drawing about 113,000 recreation visits in 2025. Visitation has climbed over the past decade, up roughly 18.6%, so crowds are trending heavier each year. Crowds concentrate sharply by season: May is the busiest month at about 2.9× the park's average month, while January is the calmest at roughly 0.2× — a 14-to-1 swing between high and low season. Roughly 38% of the year's visitors arrive in the three summer months of June, July and August alone, so timing a trip outside that window is the single biggest lever on how crowded the park feels. Weather swings from an average high-season warmth near 78°F in July down to about 31°F in January, with the wettest stretch in May and meaningful snowfall around December. About 7 months a year see comfortable average temperatures in the 50–80°F range, which is part of why crowd timing and weather timing don't always line up. The sweet spot is October: pleasant weather with noticeably thinner crowds (shoulder season). Visit then and you trade a little peak-season certainty for noticeably shorter lines and easier parking than the May rush. Daylight ranges from about 9.3 hours in midwinter to 14.7 hours near the summer solstice, which shapes how much ground you can cover in a day. These crowd figures are drawn from 1979–2025 of National Park Service visitor-use records, paired with 1991–2020 NOAA climate normals, and are updated as new monthly data is released.