Thurmont is a town in Frederick County, Maryland, United States. The population was 6,935 at the 2020 census. The town is located in the northern part of Frederick County (north of Frederick, the county seat), approximately ten miles from the Pennsylvania border, along U.S. Highway 15. It is very close to Cunningham Falls State Park and Catoctin Mountain Park, the latter of which contains the presidential retreat of Camp David. Thurmont is also home to Catoctin Colorfest, an arts and crafts festival that draws in about 125,000 people each autumn.