Summary:
Cohasset, Massachusetts is served by four public schools covering prekindergarten through grade 12: two elementary schools, Joseph Osgood (PK–2) and Deer Hill (3–5), plus Cohasset Middle School (6–8) and Cohasset High School (9–12). Together they enroll 1,397 students, with elementary grades making up the largest share at 716 students, or about 51.3%. The Cohasset district ranks 24th of 351 Massachusetts districts — the 93rd percentile — with 5 stars, and every reported MCAS proficiency rate at every Cohasset school is above the corresponding state average.
Among schools with rank history, Cohasset Middle School stands out, ranking 19th of 478 middle schools in 2025–2026 (96th percentile, 5 stars) and improving three years in a row. Its 8th-grade ELA (89.02%) and math (87.34%) results are among the strongest in the data. Cohasset High School posts excellent completion outcomes — a 99.0% graduation rate and 0.0% dropout rate — though its rank slipped from 18th of 349 to 42nd of 353, with stars moving from 5 to 4. Deer Hill holds steady in the top 10% of ranked elementary schools, while Joseph Osgood has no MCAS or rank data here, likely because it serves PK–2.
Resource patterns differ by level: the high school has the lowest student-teacher ratio (8.9) and the highest per-student spending ($20,326), while the middle school spends the least ($17,888) and elementary ratios are highest (12.3–12.4). Watch items include the high school's recent rank decline and a 10th-grade science drop from 78.41% to 56.96%. Free/reduced-lunch figures are blank for all four schools, so equity comparisons aren't possible from this data.
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