Summary:
ZIP code 98065 has three schools serving high-school grades: Mount Si High School (grades 9–12), Echo Glen School (grades 5–12), and Two Rivers School (grades 9–12). Together they enroll 2,312 students, but Mount Si accounts for about 93% of enrollment and is the area’s primary traditional high school. Echo Glen and Two Rivers are much smaller and appear to serve more specialized student populations, so their results should not be compared directly with Mount Si without considering their different settings and grade spans.
Mount Si High School is the clear standout for conventional academic and graduation measures. It ranked 12th among 396 Washington schools in 2025–2026 and reported proficiency rates of 89.66% in English language arts, 63.22% in math, and 77.67% in science. Its 96.3% graduation rate and 2.5% dropout rate were also strong. Math is its main improvement area, since performance was below the Snoqualmie Valley School District average, although it remained above the state rate. The school’s results have been consistently strong over several years, making it the most reliable choice in the ZIP code for families seeking a large, comprehensive high school.
Two Rivers School had 54.55% ELA proficiency and 25.00% math proficiency in 2025–2026, with a lower ranking of 247th statewide. Its older graduation and dropout figures were weaker than Mount Si’s, but they should not be treated as current. Echo Glen School, associated with the highly ranked Issaquah School District, reported 16.67% ELA proficiency, while math and science results were suppressed. Its very small enrollment, grades 5–12 structure, high spending, and low student-teacher ratio indicate a specialized, high-support environment. Overall, Mount Si offers the strongest measurable outcomes, while Echo Glen and Two Rivers require more cautious, mission-sensitive interpretation.
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