Summary
King Open is a public elementary school in Cambridge, MA, serving grades PK–5 at 850 Cambridge Street with 391 students, which makes it the largest PK–5 school among the immediately comparable Cambridge schools in this data, and it is part of Cambridge Public Schools, a district ranked 71st of 351 in Massachusetts.
For 2025–2026, King Open earned 3 stars and ranked 341st of 899 elementary schools statewide — the 62nd percentile, above the state median but below the district's 80th-percentile profile. Its MCAS proficiency was 50.00 in ELA, 46.75 in math, and 42.31 in science, which is above the state averages of 40.03, 41.11, and 40.98 but below the Cambridge district averages of 59.47, 57.29, and 51.03 — gaps of roughly 9–11 points in each subject. Among nearby Cambridge schools, King Open ranks fifth of six, ahead of Fletcher/Maynard Academy but behind John M Tobin, Amigos School, Martin Luther King Junior, and Cambridgeport. It generally outperforms nearby Somerville schools such as Albert F. Argenziano School at Lincoln Park, E Somerville Community, and Winter Hill Community.
Momentum is a real bright spot: King Open climbed from the 48th percentile in 2024–2025 to the 62nd in 2025–2026, with scores rising in all three subjects and science gaining about 8.3 points. Third-grade ELA (62.3) nearly matches the district average of 63.49, but 4th- and 5th-grade ELA lag by roughly 14 points, and math trails the district in every tested grade. Results vary across student groups: students with disabilities rank at the 63rd percentile, while low-income students sit at the 44th percentile — though that is a sharp climb from 16. King Open spends $35,256 per student (2020–2021), more than Tobin, Amigos, and Cambridgeport, which currently post higher proficiency.
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