Summary
Groton Dunstable Regional is a public high school in Groton, MA, serving 659 students in grades 9–12 as part of the Groton-Dunstable district. The school ranks 45th of 353 Massachusetts high schools (87th percentile, 4 stars), while the district ranks 34th of 351 (90th percentile, 5 stars). Historically, it was a top-tier school, at the 91st–98th percentile from 2015–16 through 2022–23 and peaking at 6th of 347 in 2022–23. Recently, it has slipped to the 86th–89th percentile—still strong, but not top tier. Nearby, Westford Academy and Littleton High School rank higher statewide (15th and 20th in 2025–26).
In 2025–26, 10th-grade MCAS proficiency was 69.4% in English language arts, 75% in math, 65.63% in science, and 58.82% in biology—well above state averages of 45.48%, 43.73%, 40.5%, and 37.68%. Math is the strongest relative subject, about 31 points above state. Compared with nearby schools, math is behind Westford Academy (80.1%) and Littleton High School (75.83%) but ahead of Chelmsford High (66.16%). ELA trails Westford Academy and Francis W. Parker Charter Essential School (76.12%) but leads Chelmsford (68.47%). Science is roughly tied with the charter school (65.67%) but well below Littleton (84.35%) and Westford (78.09%). Biology is comparatively weaker, below Littleton, Westford, Ayer Shirley Regional High School (65.63%), Chelmsford (64.14%), and slightly below Tyngsborough High School (58.97%), though still far above state.
Graduation and dropout outcomes are excellent: 2024–25 graduation rate was 97.5%, and the dropout rate was 0.0%, tied for best among nearby schools. The school also stands out for subgroup performance: special education students ranked 15th of 298 (95th percentile, 5 stars), and low-income students ranked 43rd of 340 (87th percentile, 4 stars). Resources are mid-to-high: $17,906 per student in 2020–21 and a student-teacher ratio of 13.7 in 2024–25. It spends more than the two higher-ranked schools but does not outperform them, while spending less than Nashoba Valley Technical High School and Gr Lowell Regional Vocational Technical and outperforming them. At 659 students, enrollment is mid-sized for area. Overall, it is a strong local option with standout math, excellent graduation/dropout results, and notable subgroup effectiveness, though not top nearby choice.
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