The top reported proficiency rate is 34% in English language arts. The lowest is 18% in Math.
Original Research by School Decision on Belvidere South Middle School
Belvidere South Middle School serves the middle grades (sixth through eighth) in Belvidere, a small industrial city in northern Illinois about 75 miles northwest of Chicago. The school has an enrollment of around 750 students, with the grade cohorts running roughly equal in size. The student body is substantially Hispanic (just over half), with White students making up roughly a third, and smaller numbers of Black, Asian, and multiracial students. Specific counts for students qualifying for free or reduced-price lunch and for English learners are not available in the data provided.
The school's state assessment results reveal a weak academic profile. In mathematics, proficiency rates range from around 14 percent in sixth and eighth grade to around 27 percent in seventh grade. In English language arts, the picture is somewhat better but still modest: sixth graders show proficiency around 30 percent, while seventh and eighth graders reach the mid-30s. In science, eighth-grade proficiency stands at around 34 percent. Participation rates in all tested areas are high and near-complete, indicating the data reflects genuine proficiency gaps rather than testing logistics. These results place the school in the bottom quartile when compared with other districts in Boone County, suggesting academic performance well below its peers in the immediate region. A parent may want to look into further detail with the school about curriculum changes, support programs, or contextual factors that affect these outcomes.
The school operates as a regular public middle school within Belvidere CUSD 100, a district that has signaled consolidation pressures. The district closed Perry Elementary at the end of the 2025-26 school year after enrollment had fallen sharply, and began enforcing a stricter cell phone policy in the 2025-26 school year, with middle schoolers required to keep devices in lockers during instructional time. These changes reflect a district managing enrollment decline and shifting toward classroom management structures that limit device use.
Belvidere itself is a community shaped by industrial history and recent economic turbulence. The city's largest employer, the Stellantis (formerly Chrysler) assembly plant, idled in February 2023 and displaced a large workforce. In October 2025, Stellantis announced a major investment to reopen the plant in 2027, which is framed by local leaders as a significant economic turnaround. The city's housing market shows median home values in the mid-to-high range and modest appreciation year-over-year. Downtown Belvidere is historically anchored and walkable, with parks, schools, and civic spaces woven into the residential layout rather than separated; new residential development is concentrated in outlying subdivisions. The community benefits from a park district with pools and recreation facilities, and the Ida Public Library.
For families considering this school, the defining feature is its low state assessment proficiency alongside a student population that is predominantly Hispanic and mixed in income. The school's peer environment is working-class and diverse. The academic trajectory and support structures for students below proficiency appear not to be converting many into proficient readers and mathematicians, and a parent looking for strong tested academic outcomes or robust intervention systems would want to probe the school's approach in detail or explore alternatives. Families seeking a neighborhood middle school in a community with deep civic anchors and manageable scale will find those qualities here.
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