Prosser High School is a school in Prosser, Washington. It is the main high school in the Prosser School District, though there is also an alternative Prosser Falls Education Center. The school has around 920 students attending in grades 9 through 12. The mascot is the Mustang and the school colors are red and white.
Serving 860 students in grades 9-12, Prosser High School ranks in the bottom 50% of all schools in Washington for overall test scores (math proficiency is bottom 50%, and reading proficiency is bottom 50%).
The percentage of students achieving proficiency in math is 15-19% (which is lower than the Washington state average of 41%). The percentage of students achieving proficiency in reading/language arts is 45-49% (which is lower than the Washington state average of 53%).
The student-teacher ratio of 20:1 is higher than the Washington state level of 16:1.
Minority enrollment is 71% of the student body (majority Hispanic), which is higher than the Washington state average of 52% (majority Hispanic).
Quick Facts (2025)
- Grades: 9-12
- Enrollment: 860 students
- Student-Teacher Ratio: 20:1
- Minority Enrollment: 71%
- Graduation Rate: 90-94% (Top 20% in WA)
- Overall Testing Rank: Bottom 50%
- Math Proficiency: 15-19% (Btm 50%)
- Reading Proficiency: 45-49% (Btm 50%)
- Science Proficiency: 45-49% (Btm 50%)
- Source: National Center for Education Statistics (NCES), WA Dept. of Education
Top Rankings
Prosser High School ranks among the top 20% of public schools in Washington for:
Category
Attribute
Graduation Rate
Percent Eligible For Free Lunch
School Overview
Prosser High School's student population of 860 students has stayed relatively flat over five school years.
The teacher population of 44 teachers has stayed relatively flat over five school years.
Grades Offered
Grades 9-12
(No virtual instruction)
(No virtual instruction)
Total Students
860 students
Gender %
Total Classroom Teachers
44 teachers
Year Founded
2025
School Calendar
Last Day of School
Mon. May 25, 2026
School Rankings
Prosser High School ranks within the bottom 50% of all 2,088 schools in Washington (based off of combined math and reading proficiency testing data).
The diversity score of Prosser 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
#1671 out of 2088 schools
(Bottom 50%)
(Bottom 50%)
Math Test Scores (% Proficient)
15-19%
41%
Reading/Language Arts Test Scores (% Proficient)
45-49%
53%
Science Test Scores (% Proficient)
45-49%
49%
Student-Teacher Ratio
20:1
16:1
American Indian
1%
1%
Asian
2%
9%
Hispanic
66%
26%
Black
n/a
5%
White
29%
48%
Hawaiian
n/a
2%
Two or more races
2%
9%
All Ethnic Groups
Graduation Rate
90-94%
84%
Eligible for Free Lunch
81%
49%
Eligible for Reduced Lunch
7%
8%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), WA Dept. of Education
School Notes
- School Mascot: Mustang
Profile last updated: 02/09/2025
Frequently Asked Questions
What is Prosser High School's ranking?
Prosser High School is ranked #1671 out of 2,088 schools, which ranks it among the bottom 50% of public schools in Washington.
What schools are Prosser High School often compared to?
Prosser High Schoolis often viewed alongside schools like Richland High School by visitors of our site.
What percent of students have achieved state testing proficiency in math and reading?
15-19% of students have achieved math proficiency (compared to the 41% WA state average), while 45-49% of students have achieved reading proficiency (compared to the 53% WA state average).
What is the graduation rate of Prosser High School?
The graduation rate of Prosser High School is 90-94%, which is higher than the Washington state average of 84%.
How many students attend Prosser High School?
860 students attend Prosser High School.
What is the racial composition of the student body?
66% of Prosser High School students are Hispanic, 29% of students are White, 2% of students are Asian, 2% of students are Two or more races, and 1% of students are American Indian.
What is the student-teacher ratio of Prosser High School?
Prosser High School has a student ration of 20:1, which is higher than the Washington state average of 16:1.
What grades does Prosser High School offer ?
Prosser High School offers enrollment in grades 9-12 (No virtual instruction).
What school district is Prosser High School part of?
Prosser High School is part of Prosser School District.
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