Windsor CUSD 1

Windsor CUSD 1 has two schools in Windsor, Illinois: Windsor Elementary School, serving prekindergarten through grade 6, and Windsor Junior & Senior High School, serving grades 7–12. Both schools’ 2025–2026 all-grades IAR English results were above the state, while their math results differed: elementary was above the state and high school was below it. The most important concern is the high school’s math result: 22% proficient, 17 points below the state’s 40%.

Windsor Elementary stands out in grades 3–5: its average ELA proficiency was 70%, 18 points above the state average, and its average math proficiency was 58%, 15 points above the state. Grade 6 ELA is a sharp exception, at 38% compared with 59% statewide. Windsor Junior & Senior High stands out in reported ELA and science: grade 7 and 8 ELA were 16 and 5 points above the state, and grade 8 science was 17 points above. Its grade 11 ACT ELA and science results were also above state results by 7 and 5 points. Because the schools serve different grade spans and some grade-level math results are suppressed, their all-grades scores are not like-for-like and the data cannot show which high-school grade drives its math result.

Both schools’ all-grades IAR results improved from 2024–2025 to 2025–2026: ELA rose 14 points at elementary and 29 at the high school, while math rose 8 and 5 points, respectively. The simple two-school ELA average moved from 9 points below the state to 10 points above; the math average improved but remained 5 points below. SchoolDigger’s overall ranking percentile rose 9 points for elementary and 50 for the high school over the reported years. Context differs too: in 2024–2025, free/reduced lunch eligible students were 45% at elementary and 37% at the high school, and student–teacher ratios were 12.6 and 9.8. Chronic absenteeism in 2025–2026 was 7% and 14%, both below the state’s 24%; the high school graduation rate was 92%.