Best Time to Visit Thomas Stone

Thomas Stone National Historic Site is a National Historic Site in MD and one of the system's hidden, low-traffic units, drawing about 5,000 recreation visits in 2024. Visitation has eased over the past decade, down about 50.2%. Crowds concentrate sharply by season: September is the busiest month at about 1.7× the park's average month, while January is the calmest at roughly 0.3× — a 5-to-1 swing between high and low season. Roughly 27% 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. If avoiding people matters most, January offers the thinnest crowds of the year, though you'll trade some warmth and daylight for the solitude. 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 1992–2025 of National Park Service visitor-use records, and are updated as new monthly data is released.