Elementary Schools in Cohasset

Cohasset has two elementary schools that together serve students from pre-kindergarten through fifth grade: Joseph Osgood, which covers grades PK–2 with 369 students, and Deer Hill, which covers grades 3–5 with 347 students. Combined enrollment is 716 students, split roughly 51.5% at Joseph Osgood and 48.5% at Deer Hill. Both schools belong to the Cohasset district, which ranks 24th of 351 in Massachusetts, placing it at the 93rd percentile with 5 stars. Because the two schools divide the elementary grades between them, families should expect their children to move from one campus to the other around third grade.

Deer Hill is the school with directly comparable achievement data, and it stands out well beyond state averages. It has earned 5 stars for three consecutive years, with state ranks of 91st of 916, 84th of 906, and 87th of 899, and percentile ranks of 90, 91, and 90 — a consistently top-10% profile. In 2025–2026, its all-grades proficiency was 63.26% in English Language Arts, 68.51% in math, and 65.79% in science, each roughly 23 to 27 points above the state. Math was the strongest subject, while science slipped 4.69 points from the prior year. At the grade level, Deer Hill matched or exceeded the district in every reported comparison; fourth-grade ELA, at 57.03%, was the lowest reported grade-level result but still 19.60 points above the state.

Joseph Osgood has no MCAS results in this data, which is consistent with its PK–2 grade span, since state testing begins in grade 3. Its academic performance therefore cannot be assessed from these figures. The two schools have nearly identical resources: student-teacher ratios of 12.3 and 12.4, and per-student spending of $19,725 and $19,752 in 2020–2021 — a difference of just $27. Free/reduced lunch percentages are blank for both schools for 2024–2025, so they should be treated as unknown rather than zero, and the spending figures are not current.