Summary:
ZIP code 92377 has two middle schools serving grades 6–8, both in Rialto Unified: Ethel Kucera Middle enrolls 978 students and Ben F. Kolb Middle enrolls 917, for 1,895 students combined. In 2025–2026, the schools’ average ELA proficiency was 48%, close to the state’s 49%, while their average math proficiency was 26%, compared with 38% statewide; science averaged 27%, versus 36% statewide. The clearest shared concern is math, where the schools’ average was 12 points below the state.
The schools stand out in different subjects: Kucera leads in overall ELA, while Kolb leads in math and science. Kucera’s ELA score was 49%, compared with Kolb’s 47%, a 2-point advantage; however, Kolb led in grades 7 and 8, while Kucera’s grade 6 ELA score was 61% versus Kolb’s 44%. Kolb’s math score was 29% against Kucera’s 24%, a 5-point lead, and its science score was 34% versus 20%, a 14-point lead. Both schools were below the state in math at every grade. Kolb also had the higher latest SchoolDigger ranking: the 52nd percentile and 3 stars, compared with Kucera’s 45th percentile and 2 stars.
Average scores improved from 2024–2025 to 2025–2026 in all three subjects, and the gap to the state narrowed by 2 points in ELA, 2 in math, and 1 in science. That progress was uneven: Kolb’s science score rose 10 points, while Kucera’s fell 1 point. SchoolDigger’s rankings also rose over three years, by 10 percentile points for Kolb and 11 for Kucera. Attendance and school context offer additional points of comparison: chronic absenteeism was 16% at Kolb and 22% at Kucera, against 18% statewide; student-teacher ratios were similar at 24.9 and 24.7. Both reported free/reduced lunch eligible for 2024–2025: 82% at Kolb and 76% at Kucera, a 6-point difference. These context measures describe the schools but do not explain their score differences.
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