Summary:
Rainier Prep Charter School District has one school, Rainier Prep, a Seattle, Washington, middle school serving grades 5–8 with 359 students. The school reports a 14.6-to-1 student–teacher ratio, 74.09% of students qualifying for free or reduced-price lunch, and $21,731 in per-student spending. Because it is the district’s only school, there are no local school-to-school comparisons; statewide results provide the most useful benchmark for families.
Rainier Prep performed well above Washington averages in every tested subject in 2025–2026. Proficiency was 71.03% in English language arts, 67.69% in math, and 66.85% in science, compared with statewide rates of 52.81%, 43.11%, and 50.95%. Math was the school’s largest statewide strength, with an advantage of nearly 25 percentage points. Results also improved in all three subjects from the prior year, including a particularly large 17.14-point gain in science. The school’s reported standing improved as well, reaching 48th out of 514 schools and the 91st percentile, with a five-star rating.
Performance varied by grade, though every reported grade-subject result exceeded the state benchmark. Seventh grade was the strongest overall, with 80.68% proficiency in ELA and 71.59% in math. Fifth grade science was another standout at 78.89%. Eighth grade had the lowest ELA and math results, at 64.84% and 63.74%, while eighth grade science was 54.95%—still above the state rate but considerably below fifth grade. Parents may want to ask how the school supports students entering eighth grade and whether the recent science gains are continuing. Overall, the data shows a high-performing, academically improving middle school with especially strong math results and broad achievement above statewide levels.
Thank you for your feedback!