Summary:
The Rainier Prep Charter School District has one middle school, Rainier Prep, serving students in grades 5–8 at its Seattle location on 12th Avenue South. The school enrolls 359 students and is the only middle-school option in the district, so families cannot compare it with another district school. Instead, the most useful comparisons are between grade levels, subjects, and Washington’s statewide results.
Rainier Prep performs well above state averages in all three tested subjects. In 2025–2026, 71.03% of students were proficient in English language arts, compared with 52.81% statewide; math proficiency was 67.69%, compared with 43.11%; and science proficiency was 66.85%, compared with 50.95%. Math was a particular strength, with every grade exceeding the state rate by at least 22 percentage points. Seventh grade had the strongest results in English language arts and math, at 80.68% and 71.59%, respectively. The school also improved in every subject from the prior year, including a notable 17.14-point increase in science.
For parents, the main area to watch is eighth grade. It had the lowest results among the available grade-level data in English language arts, math, and science, although it still exceeded statewide averages in each subject. Science showed the widest difference between grades, with 78.89% proficiency in fifth grade compared with 54.95% in eighth grade. The school’s ranking also improved substantially, moving from 126th in 2024–2025 to 48th in 2025–2026, earning a five-star rating. With a 14.6-to-1 student-teacher ratio and strong results despite substantial reported economic need, Rainier Prep appears to be a strong academic choice, while families may want to ask how the school supports students as they approach graduation from eighth grade.
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