C- Top 82%

Chelsea High School

Grades 09-12 CHELSEA, MA

Moved up 24 places from 2024 to 2025

#284 State Rank
C- District Grade
299 Everett Avenue, CHELSEA, MA 02150
Active Athletics 18 sports
Rating sources & methodology MCAS scores from 2025 Data updated September 2026
1,532 Students
84% Attendance Rate
43 Composite Score
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MCAS score comparisons

Students meeting or exceeding expectations · 2025 results

Each subject shows the average of published grade percentages, without weighting by enrollment. The bars compare available years on a 0–100% scale. Grade coverage and student groups can change between years.

English Language Arts

21% Meeting or exceeding expectations

1% exceeding expectations

2023 26% 26%
2024 29% 29%
2025 21% 21%

Mathematics

19% Meeting or exceeding expectations

3% exceeding expectations

2023 20% 20%
2024 19% 19%
2025 19% 19%

Science

19% Meeting or exceeding expectations

2% exceeding expectations

2023 19% 19%
2024 21% 21%
2025 19% 19%
View published results by year and grade
Available grade results for the latest 3 published years. An em dash means the value was not published.
YearSubjectGradeMeeting+Exceeding
2025English Language Arts10 21%1%
2025Mathematics10 19%3%
2025Science10 19%2%
2024English Language Arts10 29%3%
2024Mathematics10 19%2%
2024Science10 21%2%
2023English Language Arts10 26%3%
2023Mathematics10 20%2%
2023Science10 19%2%

MCAS subject percentages differ from the composite school rating, which combines available academic and school indicators. Letter grades and state ranks compare schools at the same level. A rank change describes relative position, not a percentage-point change in test scores. Read the rating methodology.

Student Demographics

1,532 students enrolled

Race/Ethnicity

Hispanic 89.9%
White 4.8%
Black 4%
Multiracial 0.7%
Asian 0.5%

Gender

55.3% Male
44.7% Female

Student Programs

English Learners 31.8%
Special Education 19.3%
Free/Reduced Lunch 75.9%

Athletics Programs

18 sports programs with 796 student athletes

Boys Sports

  • Softball 43 athletes
  • Basketball 38 athletes
  • Volleyball 36 athletes
  • Track-Outdoor 33 athletes
  • Rugby 33 athletes
  • Football 32 athletes
  • Baseball 15 athletes
  • Cross Country 11 athletes
  • Wrestling 2 athletes

Girls Sports

  • Wrestling 243 athletes
  • Unified Basketball 155 athletes
  • Soccer 34 athletes
  • Track-Outdoor 32 athletes
  • Volleyball 24 athletes
  • Baseball 22 athletes
  • Track-Indoor 21 athletes
  • Softball 16 athletes
  • Basketball 6 athletes

Sports data from the Massachusetts Interscholastic Athletic Association (MIAA).

School Performance

Key metrics and program information

Graduation

9.6% Dropout Rate

Attendance

84% Attendance Rate
52.5% Chronic Absence

Advanced Placement

College Readiness

MassCore is Massachusetts' recommended college-ready curriculum.

Staffing

Location

299 Everett Avenue, CHELSEA, MA

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C--Rated School

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Part of Chelsea School District

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Other Schools in Chelsea School District

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Phoenix Academy Charter Public High School, Chelsea

High • #342 State
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Chelsea Opportunity Academy

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William A Berkowitz Elementary School

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Edgar A Hooks Elementary School

Elementary • #409 State
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George F. Kelly Elementary School

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Frank M Sokolowski Elementary School

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Frequently Asked Questions

What is Chelsea High School's grade rating?

Chelsea High School has earned a grade of C-, ranked #284 in Massachusetts, placing it in the top 82% of Massachusetts High schools. This rating is based on 2025 MCAS test scores, attendance rates, and other performance metrics from the Massachusetts Department of Elementary and Secondary Education.

How many students attend Chelsea High School?

Approximately 1,532 students are enrolled at Chelsea High School.

How does Chelsea High School perform on MCAS tests?

Based on the most recent MCAS results, Chelsea High School's proficiency rates are: English Language Arts (21% proficient), Mathematics (19% proficient), Science (19% proficient). MCAS (Massachusetts Comprehensive Assessment System) tests measure student achievement in English Language Arts, Mathematics, and Science.

What sports does Chelsea High School offer?

Chelsea High School offers 18 athletic programs (9 boys' sports, 9 girls' sports) with approximately 796 student athletes participating. Sports programs are sanctioned by the MIAA (Massachusetts Interscholastic Athletic Association).

What is the graduation rate at Chelsea High School?

Chelsea High School has a solid 85.3% graduation rate. The state average graduation rate in Massachusetts is approximately 89%.

What is the attendance rate at Chelsea High School?

Chelsea High School has an attendance rate of 84%. Strong attendance is correlated with better academic outcomes.

What school district is Chelsea High School part of?

Chelsea High School is part of Chelsea School District. For enrollment information, contact the district office or visit the school's website. Enrollment typically requires proof of residency within the district boundaries.

How are Massachusetts school ratings calculated?

School ratings are calculated using multiple data points from the Massachusetts Department of Elementary and Secondary Education (DESE), including MCAS test scores (proficiency and growth), attendance rates, graduation rates (for high schools), and student-teacher ratios. Schools are ranked by percentile against similar schools statewide.