Summary:
Zip code 57018 has one elementary school, Tri-Valley Elementary in Colton, serving kindergarten through fifth grade with 154 students. In 2025–2026, its all-grade proficiency was above the state in English language arts (ELA) and mathematics: 52% versus 49% in ELA, and 48% versus 44% in math. Science was the clear exception, at 26% compared with 42% statewide and 39% in the district. The most important finding for families is that science proficiency trails the state by 16 percentage points.
There is no top or bottom school within the ZIP code because Tri-Valley is the only school listed; compared with the state, it stands out positively in ELA and math and negatively in science. Its ELA advantage over the state was 3 percentage points, and its math advantage was 4 points, while its science result was 16 points lower. The available grade-level results are particularly strong in math: third graders reached 70% proficiency versus 52% statewide, an 18-point advantage, and fourth graders reached 68% versus 49%, a 20-point advantage. Grade-level ELA was also above the state, by 15 points in third grade and 5 points in fourth grade.
ELA and math results declined from 2024–2025, although the school remained above the state: ELA fell by 9 percentage points and math by 9 points, narrowing its state advantages by 7 and 9 points, respectively. Meanwhile, SchoolDigger’s ranking rose from the 28th percentile and 1 star in 2023–2024 to the 82nd percentile and 4 stars in 2025–2026. Attendance is another favorable measure: chronic absenteeism was 5% in 2025–2026, compared with 7% in the district and 20% statewide. The school’s student-teacher ratio was 12:1 in 2024–2025, and 16% of students were reported as free/reduced lunch eligible that year; these figures provide context, not an explanation for achievement.
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