Mount Si High School is a high school located in the Snoqualmie Valley in Snoqualmie, Washington and is a part of the Snoqualmie Valley School District.
Serving 2,152 students in grades 9-12, Mount Si High School ranks in the top 20% of all schools in Washington for overall test scores (math proficiency is top 30%, and reading proficiency is top 30%).
The percentage of students achieving proficiency in math is 54% (which is higher than the Washington state average of 41%). The percentage of students achieving proficiency in reading/language arts is 89% (which is higher than the Washington state average of 53%).
The student-teacher ratio of 21:1 is higher than the Washington state level of 17:1.
Minority enrollment is 29% of the student body (majority Hispanic and Asian), which is lower than the Washington state average of 53% (majority Hispanic).
Quick Facts (2026)
- Grades: 9-12
- Enrollment: 2,152 students
- Student-Teacher Ratio: 21:1
- Minority Enrollment: 29%
- Graduation Rate: 96% (Top 5% in WA)
- Overall Testing Rank: Top 20%
- Math Proficiency: 54% (Top 30%)
- Reading Proficiency: 89% (Top 5%)
- Science Proficiency: 82% (Top 5%)
- Attendance Zone: Mount Si High School serves the entire district of Snoqualmie, WA, encompassing an attendance zone of approximately 393.7 square miles. Families can expect a typical drive of 20-30 minutes to reach the school, with the furthest edge being about 24.8 miles away.
- Source: National Center for Education Statistics (NCES), WA Dept. of Education
Top Rankings
Mount Si High School ranks among the top 20% of public schools in Washington for:
Category
Attribute
Overall Rank
Reading/Language Arts Proficiency
Science Proficiency
Graduation Rate
School Overview
Mount Si High School's student population of 2,152 students has stayed relatively flat over five school years.
The teacher population of 101 teachers has grown by 12% over five school years.
Grades Offered
Grades 9-12
(Supplemental Virtual)
(Supplemental Virtual)
Total Students
2,152 students
Total Classroom Teachers
101 teachers
Year Founded
1944
Colors
Grey, Scarlet
School Calendar
School Rankings
Mount Si High School ranks within the top 20% of all 2,088 schools in Washington (based off of combined math and reading proficiency testing data).
The diversity score of Mount Si High School is 0.48, which is less than the diversity score at state average of 0.69. The school's diversity has stayed relatively flat over five school years.
Overall Testing Rank
#213 out of 2088 schools
(Top 20%)
(Top 20%)
Math Test Scores (% Proficient)
54%
41%
Reading/Language Arts Test Scores (% Proficient)
89%
53%
Science Test Scores (% Proficient)
82%
49%
Student-Teacher Ratio
21:1
17:1
American Indian
1%
1%
Asian
9%
9%
Hispanic
11%
27%
Black
1%
5%
White
71%
47%
Hawaiian
n/a
2%
Two or more races
7%
9%
All Ethnic Groups
Graduation Rate
96%
84%
Chronically Absent Students
(22-23)28.9%
34.7%
Eligible for Free Lunch
10%
39%
Eligible for Reduced Lunch
3%
9%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), WA Dept. of Education
School Notes
- School Mascot: Wildcat
Frequently Asked Questions
What is Mount Si High School's ranking?
Mount Si High School is ranked #213 out of 2,088 schools, which ranks it among the top 20% of public schools in Washington.
What percent of students have achieved state testing proficiency in math and reading?
54% of students have achieved math proficiency (compared to the 41% WA state average), while 89% of students have achieved reading proficiency (compared to the 53% WA state average).
What is the graduation rate of Mount Si High School?
The graduation rate of Mount Si High School is 96%, which is higher than the Washington state average of 84%.
How many students attend Mount Si High School?
2,152 students attend Mount Si High School.
What is the racial composition of the student body?
71% of Mount Si High School students are White, 11% of students are Hispanic, 9% of students are Asian, 7% of students are Two or more races, 1% of students are American Indian, and 1% of students are Black.
What is the student-teacher ratio of Mount Si High School?
Mount Si High School has a student ration of 21:1, which is higher than the Washington state average of 17:1.
What grades does Mount Si High School offer ?
Mount Si High School offers enrollment in grades 9-12 (Supplemental Virtual).
What school district is Mount Si High School part of?
Mount Si High School is part of Snoqualmie Valley School District.
School Reviews
Review Mount Si High School. Reviews should be a few sentences in length. Please include any comments on:
- Quality of academic programs, teachers, and facilities
- Availability of music, art, sports and other extracurricular activities
Recent Articles
How to Evaluate School Safety Beyond Headlines
Learn how to evaluate school safety beyond headlines by examining reliable data, school climate, emergency planning, bullying prevention, communication, student experiences, and everyday security practices before choosing a school.
Choosing a Public School for Executive Function Needs
Learn how to choose a public school for a child with executive function challenges by evaluating routines, classroom support, organization, accommodations, communication, transitions, and special education services before enrollment.
What School Climate Surveys Tell You Before Enrolling
Learn how school climate surveys reveal student safety, belonging, relationships, engagement, and support, and how families can interpret results carefully before choosing a public school for their child today.
