Summary:
Cos Cob, Connecticut is home to a single school, Cos Cob School, an elementary institution serving grades PK through 5 within the highly rated Greenwich School District.
As the only school in the area, Cos Cob School stands out as a strong performer by state standards. The school has shown impressive improvement in its statewide ranking, climbing from 159th to 102nd out of nearly 500 Connecticut elementary schools over the past three years, earning a 4-star rating. Students score well above state averages in English Language Arts, math, and science across all tested grades. For example, 3rd grade ELA proficiency jumped nearly 19 points in the latest year to 77.2%, while 5th grade science reached 77.3% proficiency, almost matching the district’s 78.9% and far exceeding the state’s 52.9%. Chronic absenteeism is notably low at just 6.0%, less than half the state rate. The school also benefits from a favorable 10:1 student-teacher ratio and high per-student spending of $22,254, alongside a relatively low free/reduced-price lunch rate of 16.03%.
While Cos Cob School excels relative to Connecticut as a whole, it consistently trails the broader Greenwich district in most subjects. The most significant gap appears in 4th grade math, where the school’s 62.9% proficiency is 21 points below the district’s 83.9%. Math results have been mixed, with a notable decline in 4th grade despite gains in 3rd and 5th grades. This suggests that while the school is a solid option with strong resources and engaged students, families within the district may see differences in performance across grade levels and subject areas. Overall, Cos Cob School is a high-achieving, well-supported elementary school that offers a strong foundation, with room to grow in specific areas when compared to its immediate district peers.
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