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Public School Review - Established 2003

Horizon High School

5321 East 136th Avenue
Brighton, CO 80601
(School attendance zone shown in map)
View full size Get directions
: 
9/
10
Top 20%
Tel: (720) 972-4400
horizon.adams12.org
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Horizon High School is a public secondary institution located in Thornton, Colorado.
Serving 1,966 students in grades 9-12, Horizon High School ranks in the top 20% of all schools in Colorado for overall test scores (math proficiency is top 30%, and reading proficiency is top 30%).
The percentage of students achieving proficiency in math is 49% (which is higher than the Colorado state average of 33%). The percentage of students achieving proficiency in reading/language arts is 62% (which is higher than the Colorado state average of 45%).
The student-teacher ratio of 20:1 is higher than the Colorado state level of 15:1.
Minority enrollment is 47% of the student body (majority Hispanic), which is lower than the Colorado state average of 51% (majority Hispanic).

Quick Facts (2026)

  • Grades: 9-12
  • Enrollment: 1,966 students
  • Student-Teacher Ratio: 20:1
  • Minority Enrollment: 47%
  • : 96% (Top 5% in CO)
  • : Top 20%
  • : 49% (Top 30%)
  • : 62% (Top 20%)
  • : 29% (Top 50%)
  • Source: National Center for Education Statistics (NCES), CO Dept. of Education

Top Rankings

Horizon High School ranks among the top 20% of public schools in Colorado for:

Category
Attribute
Overall Rank
Highest overall rank (Top 20%)
Reading/Language Arts Proficiency
Highest reading/language arts proficiency (Top 20%)
Graduation Rate
Highest graduation rate (Top 5%)

School Overview

Horizon High School's student population of 1,966 students has stayed relatively flat over five school years.
The teacher population of 98 teachers has stayed relatively flat over five school years.
Grades Offered
Grades 9-12
(No virtual instruction)

Distribution of Students By Grade Trends

GradeHorizon High School
9465
10505
11524
12472
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Total Students
1,966 students

Total Students Trends Over Years (1989-2025)

YearHorizon High School
20251,966
20241,981
20232,026
20221,999
20212,067
20202,059
20192,007
20181,979
20171,979
20162,025
20152,007
20141,970
20131,925
20121,901
20111,813
20101,881
20091,939
20082,079
20072,211
20062,491
20052,269
20042,094
20032,024
20022,054
20012,206
20002,532
19992,414
19982,314
19972,185
19962,102
19952,062
19941,502
19931,526
19921,431
19911,427
19901,262
1989815
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Total Classroom Teachers
98 teachers

Total Classroom Teachers Trends Over Years (1989-2025)

YearHorizon High School
202598
2024100
202399
202297
2021101
202098
201996
201894
201794
201695
201593
201493
201382
201291
201192
201092
200999
2008106
2007105
2006119
2005108
2004103
200398
200298
2001107
2000118
1999114
1998104
1997101
199693
199585
199473
199374
199272
199173
199060
198932
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Year Founded
1988
Colors
Maroon, Silver
School Calendar
View School Calendar

School Rankings

Horizon High School ranks within the top 20% of all 1,748 schools in Colorado (based off of combined math and reading proficiency testing data).
The diversity score of Horizon High School is 0.60, which is less than the diversity score at state average of 0.63. The school's diversity has stayed relatively flat over five school years.
Definition of Terms
This School
State Level (CO)
#318 out of 1748 schools
(Top 20%)

Overall School Rank Trends Over Years (2012-2023)

YearHorizon High School
2023#318
2022#356
2021#265
2019#427
2018#614
2017#830
2016#694
2015#694
2014#1110
2013#1019
2012#1134
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49%
33%

Math Proficiency Comparison Over Years (2012-2023)

YearHorizon High SchoolColoradoAdams 12 Five Star Schools
202349%33%34%
202243%32%32%
202145%33%31%
201944%35%35%
201848%35%34%
201740%33%34%
201647%33%33%
201536%31%31%
201444%57%55%
201343%57%55%
201241%56%54%
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62%
45%

Reading and Language Arts Proficiency Comparison Over Years (2011-2022)

YearHorizon High SchoolColoradoAdams 12 Five Star Schools
202262%45%43%
202165%47%46%
201961%47%46%
201843%44%34%
201734%42%41%
201633%40%37%
201539%40%36%
201468%69%65%
201373%70%65%
201269%70%65%
201195%89%88%
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(20-21)
29%
29%
Student-Teacher Ratio
20:1
15:1

Student-Teacher Ratio Comparison Over Years (1989-2025)

YearHorizon High SchoolColoradoAdams 12 Five Star Schools
202520:115:1
202420:117:117:1
202320:117:118:1
202221:117:118:1
202120:117:118:1
202021:117:120:1
201921:117:120:1
201821:117:120:1
201721:117:120:1
201621:117:119:1
201522:117:119:1
201421:118:120:1
201324:118:121:1
201221:118:120:1
201120:117:120:1
201021:117:120:1
200920:117:120:1
200820:117:120:1
200721:117:119:1
200621:117:119:1
200521:117:120:1
200420:117:120:1
200321:117:120:1
200221:117:119:1
200121:118:120:1
200021:117:119:1
199921:118:119:1
199822:118:120:1
199722:118:120:1
199623:118:120:1
199524:118:119:1
199420:119:119:1
199321:118:119:1
199220:118:119:1
199120:118:119:1
199021:118:119:1
198926:118:119:1
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American Indian
1%
1%

American Indian Student Percentage Comparison Over Years (1994-2022)

YearHorizon High SchoolColoradoAdams 12 Five Star Schools
20221%1%
20141%1%2%
20131%1%1%
20121%1%1%
20101%1%1%
20091%1%1%
20081%2%1%
20071%1%1%
20061%1%1%
20051%1%1%
20041%1%1%
20031%1%1%
20021%1%2%
20012%1%1%
20001%1%1%
19991%1%1%
19981%1%1%
19971%1%1%
19961%1%1%
19951%1%1%
19941%1%1%
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Asian
5%
3%

Asian Student Percentage Comparison Over Years (1992-2024)

YearHorizon High SchoolColoradoAdams 12 Five Star Schools
20245%3%7%
20236%3%6%
20226%3%7%
20216%3%6%
20206%3%5%
20196%3%5%
20187%3%5%
20177%3%5%
20167%3%5%
20157%3%6%
20146%3%5%
20135%3%5%
20125%3%5%
20111%3%3%
20105%4%6%
20095%4%6%
20085%3%5%
20074%3%5%
20065%3%5%
20054%3%5%
20045%3%5%
20034%3%5%
20024%3%5%
20013%3%5%
20003%3%4%
19992%3%4%
19982%3%4%
19971%3%3%
19962%3%3%
19952%3%3%
19941%2%3%
19931%2%3%
19922%2%3%
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Hispanic
35%
37%

Hispanic Student Percentage Comparison Over Years (1992-2024)

YearHorizon High SchoolColoradoAdams 12 Five Star Schools
202435%36%46%
202334%35%45%
202232%35%44%
202130%34%44%
202028%34%42%
201927%34%42%
201827%34%41%
201727%34%41%
201626%33%40%
201525%33%38%
201425%33%35%
201324%32%33%
201225%32%33%
201124%32%32%
201023%29%31%
200923%28%31%
200822%28%31%
200722%28%30%
200623%27%29%
200522%26%28%
200420%25%27%
200320%24%25%
200216%23%24%
200114%22%23%
200013%21%21%
199912%20%20%
199812%19%19%
199712%19%19%
199612%18%18%
199510%18%17%
199410%17%16%
199313%17%16%
199213%17%16%
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Black
1%
5%

Black Student Percentage Comparison Over Years (1993-2024)

YearHorizon High SchoolColoradoAdams 12 Five Star Schools
20241%5%2%
20231%5%2%
20221%4%2%
20212%5%2%
20202%5%2%
20192%5%2%
20181%5%2%
20171%5%2%
20162%5%2%
20152%5%3%
20142%5%2%
20132%5%2%
20122%5%3%
20102%6%3%
20092%6%3%
20083%6%3%
20073%6%3%
20062%6%3%
20053%6%3%
20043%6%2%
20032%6%3%
20022%6%2%
20011%6%2%
20001%5%2%
19991%5%2%
19981%5%2%
19971%5%2%
19961%5%2%
19951%4%2%
19941%5%2%
19931%5%2%
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White
53%
49%

White Student Percentage Comparison Over Years (1992-2024)

YearHorizon High SchoolColoradoAdams 12 Five Star Schools
202454%50%41%
202353%51%42%
202255%52%43%
202158%52%44%
202061%53%47%
201963%53%47%
201864%53%50%
201764%53%50%
201665%54%51%
201566%54%51%
201466%55%54%
201367%56%57%
201267%56%57%
201175%57%63%
201069%60%59%
200969%61%59%
200869%61%60%
200770%62%61%
200669%63%62%
200570%64%63%
200471%65%65%
200373%66%66%
200277%67%67%
200180%68%69%
200082%70%72%
199984%71%73%
199884%72%74%
199785%72%75%
199684%73%76%
199586%74%77%
199486%75%78%
199384%75%78%
199284%75%78%
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Hawaiian
n/a
n/a
Two or more races
5%
5%

Two or More Races Student Percentage Comparison Over Years (2013-2024)

YearHorizon High SchoolColoradoAdams 12 Five Star Schools
20245%5%4%
20236%5%5%
20225%5%4%
20214%5%4%
20203%4%3%
20192%4%3%
20181%4%2%
20171%4%2%
20131%3%2%
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All Ethnic Groups
0.60
0.63

Diversity Score Comparison Over Years (1989-2025)

YearHorizon High SchoolColoradoAdams 12 Five Star Schools
20250.600.62
20240.590.620.62
20230.600.620.62
20220.590.610.62
20210.570.610.61
20200.550.600.60
20190.530.600.60
20180.520.600.59
20170.520.600.59
20160.510.600.58
20150.500.600.58
20140.510.590.58
20130.500.590.57
20120.500.590.57
20110.380.580.51
20100.470.550.55
20090.470.550.55
20080.480.550.54
20070.460.540.54
20060.480.530.53
20050.460.520.53
20040.450.520.51
20030.430.510.50
20020.380.500.49
20010.340.490.48
20000.310.470.44
19990.280.460.43
19980.280.460.41
19970.270.450.40
19960.280.450.39
19950.250.430.37
19940.250.410.36
19930.280.410.35
19920.280.400.35
19910.270.400.35
19900.250.400.34
19890.250.400.34
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96%
82%

Graduation Rate Comparison Over Years (2013-2023)

YearHorizon High SchoolColoradoAdams 12 Five Star Schools
202396%82%83%
202296%82%83%
202195%81%81%
202095%81%84%
201995%80%83%
201893%80%84%
201796%78%84%
201695%78%81%
201593%77%78%
201494%77%74%
201393%77%74%
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Eligible for Free Lunch
27%
39%

Free Lunch Eligibility Comparison Over Years (1989-2025)

YearHorizon High SchoolColoradoAdams 12 Five Star Schools
202527%39%
202424%39%41%
202318%33%34%
202213%30%31%
202114%33%32%
202012%33%29%
201911%33%29%
201814%35%31%
201714%35%31%
201615%34%31%
201514%34%30%
201415%35%31%
201312%34%30%
20125%34%27%
20118%33%28%
20107%31%26%
20095%28%23%
20087%28%23%
20077%27%24%
20069%27%23%
20056%25%19%
20048%24%19%
20036%22%16%
20024%21%15%
20013%20%14%
20002%21%14%
19992%21%14%
19983%22%17%
19972%22%15%
19964%22%17%
19955%22%18%
19943%21%16%
19934%20%15%
19924%19%15%
19914%18%14%
19903%18%14%
19894%17%13%
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Eligible for Reduced Lunch
6%
5%

Reduced-Price Lunch Eligibility Comparison Over Years (2001-2025)

YearHorizon High SchoolColoradoAdams 12 Five Star Schools
20256%5%
20247%6%8%
20239%7%11%
20226%6%9%
20216%7%9%
20206%8%9%
20196%8%9%
20187%8%7%
20177%8%7%
20166%7%7%
20154%7%7%
20147%7%6%
20136%7%7%
20124%7%6%
20112%7%6%
20102%7%6%
20091%7%6%
20082%7%6%
20072%7%5%
20064%6%6%
20053%6%6%
20043%6%6%
20033%7%6%
20023%7%7%
20013%7%7%
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School Statewide Testing
View Education Department Test Scores
School District Name
Adams 12 Five Star Schools
Source: National Center for Education Statistics (NCES), CO Dept. of Education

School Notes

  • School Mascot: Hawk
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Frequently Asked Questions

What is Horizon High School's ranking?
Horizon High School is ranked #318 out of 1,748 schools, which ranks it among the top 20% of public schools in Colorado.
What schools are Horizon High School often compared to?
Horizon High Schoolis often viewed alongside schools like Mountain Range High School by visitors of our site.
What percent of students have achieved state testing proficiency in math and reading?
49% of students have achieved math proficiency (compared to the 33% CO state average), while 62% of students have achieved reading proficiency (compared to the 45% CO state average).
What is the graduation rate of Horizon High School?
The graduation rate of Horizon High School is 96%, which is higher than the Colorado state average of 82%.
How many students attend Horizon High School?
1,966 students attend Horizon High School.
What is the racial composition of the student body?
53% of Horizon High School students are White, 35% of students are Hispanic, 5% of students are Asian, 5% 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 Horizon High School?
Horizon High School has a student ration of 20:1, which is higher than the Colorado state average of 15:1.
What grades does Horizon High School offer ?
Horizon High School offers enrollment in grades 9-12 (No virtual instruction).
What school district is Horizon High School part of?
Horizon High School is part of Adams 12 Five Star Schools.

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Quick Facts (2026)

  • Grades: 9-12
  • Enrollment: 1,966 students
  • Student-Teacher Ratio: 20:1
  • Minority Enrollment: 47%
  • : 96% (Top 5%)
  • : Top 20%
  • : 49% (Top 30%)
  • : 62% (Top 20%)
  • : 29% (Top 50%)
  • Source: National Center for Education Statistics (NCES), CO Dept. of Education

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