The top reported proficiency rate is 73% in English language arts. The lowest is 45% in Math.
Original Research by School Decision on Cass Jr High School
Cass Jr High School is a small middle school serving grades five through eight in Darien, a bedroom suburb west of Chicago. The school draws about evenly across grade levels from a community that is predominantly white with growing Asian and Hispanic populations. State test data is available for grades five through eight; grades three and four serve smaller cohorts whose data was not publicly reported.
In math, performance is mixed across grades. Fifth grade shows lower proficiency, while sixth and seventh grade students demonstrate proficiency at roughly the midpoint between struggling and strong. Eighth grade math proficiency sits modestly below that. The school's overall math performance across tested grades places it below the midpoint compared to other districts in DuPage County. In English language arts, the picture is notably stronger. Fifth grade proficiency is solid, sixth grade shows strong results, and both seventh and eighth grades demonstrate proficiency well above the midpoint. Science proficiency in fifth grade is lower, but eighth grade science performance is strong. Test participation rates are consistently very high across all grades and subjects. The benchmark shift in state testing this year makes year-to-year trend comparison difficult, so a parent may want to ask the school directly how results compare to prior years.
The school sits in a predominantly residential suburb organized around highways and expressway interchanges rather than walkable streets. Darien is a planned community centered on single-family homes on quarter- and half-acre lots, about 17 to 18 miles west of downtown Chicago. The community offers public facilities including the Indian Prairie Public Library, Darien Community Park, and the Darien Sportsplex, though most daily activity is car-dependent. Most Darien residents commute outside the city for work.
Cass District 63 recently moved through a significant facility modernization. Voters approved a bond referendum in November 2022 after rejecting an earlier version, raising property taxes to fund geothermal heating and cooling replacement, fire alarm and video surveillance upgrades, and an integrated communications system at both Concord Elementary and Cass Junior High. Interior HVAC construction began in May 2024, meaning families will experience ongoing facility work while improvements are completed over a multi-year timeline. This represents a committed infrastructure investment and a corresponding property tax impact for district residents.
Housing values in the Darien area are moderate to above-average for the region. Homes listed for sale in the area are priced substantially, and rental costs reflect the suburban character. The area remains largely built-out, with recent development interest concentrated on major corridors such as 87th Street, where redevelopment pressure favors higher-density multifamily and commercial uses rather than additional single-family subdivisions.
Free-or-reduced-price lunch eligibility data and special education or English learner enrollment counts were not available in the data provided. Enrollment information was limited, so a parent may want to ask the district directly about the full student support landscape and any specialized academic pathways the school offers. No data on staffing, attendance, discipline, or coursework was available, which means a conversation with school staff about classroom size, extracurricular offerings, and how the school approaches middle grades academics would fill important gaps.
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