Summary
Mosier is a public elementary school in South Hadley, MA, serving 365 students in grades 2–4 as part of the South Hadley district, which ranks 243 of 351 districts statewide (31st percentile, 2 stars). Mosier's own 2025–26 rank is 613 of 899, or 32nd percentile with 2 stars—roughly typical for its district. Percentile rankings have mostly sat in the 40s over the past decade, with a high of 63rd in 2017–18, a low of 27th in 2024–25, and a modest rebound since. Its student-teacher ratio rose from 11.6 in 2022–23 to 13.3 in 2024–25, and per-student spending was $14,723 in 2020–21. Nearby Plains Elementary serves PK–1 with no comparable test data, making Mosier the first MCAS-tested elementary school in the district.
Mosier scores below the state average in both tested subjects: all-grade ELA is 32.16% vs. 40.03% statewide, and math is 32.55% vs. 41.11%. Math is a relative strength within the district—32.55% vs. the South Hadley average of 27.06%—and improved slightly from 29.08% in 2024–25. Grade 3 ELA is close to state and district levels (42.20% vs. 42.79% and 41.59%), but Grade 4 ELA is the clearest red flag at 24.66% vs. 37.43% statewide. Since Grade 4 is the exiting grade, this is a critical area for intervention. Locally, Mosier outperforms most Holyoke and some Chicopee schools but trails East Meadow (40.29% ELA, 41.75% math), Bowie, and Lambert-Lavoie, whose math reaches 43.24%.
Subgroup results are uneven: special education students are a bright spot at 61st percentile, 3 stars in 2025–26, up from 41st and 40th previously, while low-income students rank 19th percentile, 1 star. Resource context may matter—Mosier has the lowest per-student spending in the nearby set and one of the highest ratios (13.3), while higher-performing East Meadow, Bowie, and Lambert-Lavoie spend more with smaller classes. That is a pattern, not proof of cause; several Holyoke schools spend more yet perform far lower. Science comparisons don't apply because Mosier ends at Grade 4, and free/reduced lunch data are unavailable.
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