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A−

Horizon High School

PublicHighGrades 9–12

5321 East 136th Avenue, Brighton, CO 80601 · (720) 972-4400 · Part of Adams 12 Five Star Schools

Thornton’s School Grade B+ better than 65% of Colorado school districts

Directions
Students
1,966
Students per teacher
20:1
Free or reduced lunch
33%
Setting
Suburb
Grades
9–12
The gist

What stands out about Horizon High School

  • Its own letter, A−: reading and math results near the top of Colorado’s public schools
  • Math proficiency 15 pts above the state
  • Reading / language arts 18 pts above the state
  • Larger classes: 20 students per teacher

On the path

Where Thornton kids come from and go next. The whole path →

6–87 middle schoolsDepends on your address
9–12Horizon High SchoolYou are here

Test scores

2020–21
Math proficiency45%
State average 30.5%
Reading / language arts65%
State average 47%

Its own letter, A−, places these results among Colorado’s 1,665 public schools with results. Source: EDFacts via Urban Institute Education Data Portal (SY2020-21).

Location

Directions ↗

5321 East 136th Avenue, Brighton

Students

Enrollment by grade
Grade 9465
Grade 10505
Grade 11524
Grade 12472
Enrollment over time
2,067’20
1,999’21
2,026’22
1,981’23
1,966’24

Down 4.9% since 2020–21.

Who goes here
White 53%Hispanic 35%Two or more races 5%Asian 5%Black 1%American Indian/Alaska Native <1%Native Hawaiian/Pacific Islander <1%

As reported to NCES, share of students with a reported race or ethnicity.

Parents talk

Questions and answers about Horizon High School from Thornton families.

Other schools in Adams 12 Five Star Schools

The district →
STEM Lab
Elementary · Grades PK–8 · Northglenn
A−
740 students18:1
Thunder Vista P-8
Elementary · Grades PK–8 · Broomfield
A
725 students16:1
Mountain View Elementary School
Elementary · Grades PK–5 · Broomfield
B
517 students16:1
Hunters Glen Elementary School
Elementary · Grades PK–5 · Thornton
C+
491 students18:1
Tarver Elementary School
Elementary · Grades PK–5 · Thornton
C+
475 students21:1
Arapahoe Ridge Elementary School
Elementary · Grades PK–5 · Westminster
B−
465 students18:1

School facts: U.S. Department of Education (NCES), 2024–2025 school year. Test scores: EDFacts via Urban Institute Education Data Portal (SY2020-21). A school’s letter is our own summary of its reading and math results against Colorado’s other public schools; Thornton’s School Grade is built from its districts’ results. Map: © OpenStreetMap contributors.