Great Barrington is the largest town in the Berkshire Hills Regional School District, which includes the towns of Stockbridge and West Stockbridge, and the villages of Housatonic, Glendale and Interlaken. All three school levels are in Great Barrington. Muddy Brook Regional Elementary School offers pre-kindergarten through fourth grade classes and is off Route 7 in the northern part of town. Monument Valley Regional Middle School offers grades five through eight. Monument Mountain Regional High School (MMRHS) opened in 1968, consolidating the former Searles High School in Great Barrington and Williams High School in Stockbridge, and serves the high school students of the district. Students from Otis and Sandisfield also attend the school as part of a tuition agreement for high schools.