Washington D.C. The site is located on Rose Hill Road between Maryland Routes 6 and 225 near Port Tobacco, Maryland. No admission fees. The site is fairly new and is still developing. Visitation is light throughout the year and heaviest during summer. Summers are hot and humid with occasional thunderstorms.
Winters are cold with variable precipitation.
Wearing layers of clothing is recommended during late fall, winter, and early spring. To reach Thomas Stone NHS, visitors must use personal transportation. No public transportation systems serve the site. Only foot traffic is allowed at the site when off of park roads. The site opened to the public in March 1992 and is still under development.