Glastonbury High School
Glastonbury, CT · High School · Grades 9-12
Glastonbury High School is a high school in Glastonbury, CT with 1,801 students enrolled and a 56% proficiency rate. Part of Glastonbury School District. NCES data from the U.S. Department of Education.
Glastonbury High School is a high school in Glastonbury, CT, enrolling 1,801 students in grades 9-12 within the Glastonbury School District. That headcount is above the 686-student average for schools in the district.
EDFacts assessment data puts 56% of students at or above grade level in combined math and reading, a little above the national midpoint where roughly half of tested students clear the bar. That is 8 points below the 64% average for the Glastonbury School District. Against the 53% Connecticut statewide average, the school sits 3 points higher.
Over the last three reported years the district proficiency rate this school inherits has fallen by about 13 points. As a high school, it reports a 90% adjusted-cohort graduation rate, the share of first-time ninth-graders who earn a regular diploma within four years.
The student-teacher ratio is 12.8 to 1, below the U.S. average of roughly 16 to 1, which generally allows more adult attention per student. A relatively low 13% of students qualify for free or reduced-price lunch.
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About This School
Glastonbury High School is a high school located in Glastonbury, Connecticut. The school serves 1,801 students in grades 9-12. The student-to-teacher ratio is 12.8:1.
According to EDFacts assessment data, 56% of students meet grade-level proficiency standards in combined math and reading. The school reports a 90% graduation rate.
13% of students qualify for free or reduced-price lunch.
Glastonbury High School is part of the Glastonbury School District in Connecticut.
How This School Compares
Glastonbury High School has 1,801 students enrolled, making it larger than the average school in Glastonbury School District (686 students). Its 56% proficiency rate is 8 percentage points below the district average of 64%. Compared to the Connecticut state average of 53%, the school performs 3 points higher. With a 12.8:1 student-teacher ratio, it offers smaller class sizes than the national average.
Frequently Asked Questions
Glastonbury High School has 1,801 students enrolled in grades 9-12. The student-to-teacher ratio is 12.8:1.
According to EDFacts data, 56% of students at Glastonbury High School meet grade-level proficiency standards in combined math and reading assessments.
Glastonbury High School has a 90% graduation rate, measuring the percentage of students who graduate within four years.
Glastonbury High School is part of the Glastonbury School District in Glastonbury, Connecticut. You can view all schools in this district on the district page.
All data on this page comes from the National Center for Education Statistics (NCES) Common Core of Data and EDFacts assessment results. These are official federal datasets published by the U.S. Department of Education.
School profiles are built from NCES directory data and EDFacts assessment results. Proficiency rates reflect combined math and reading performance. Graduation rates are reported for high schools with available data.
Source: NCES Common Core of Data, 2026.