What grades does Riverdale Ridge High School serve?

As a High school, Riverdale Ridge High School serves students in THORNTON, CO. The school is administered by the local school district.

Where is Riverdale Ridge High School located?

You can find Riverdale Ridge High School in THORNTON, CO.

What is the student-teacher ratio at Riverdale Ridge High School?

At Riverdale Ridge High School, there are approximately 21.2 students for every teacher.

What schools are in THORNTON, CO?

Riverdale Ridge High School is among the schools serving THORNTON, CO. The school is part of the local school system.

COHighCalendar available · 18 events · Auto-updating

Events confirmed from School District 27J's official calendar.

Riverdale Ridge High School — School Calendar 2026-27

High|THORNTON, Colorado|School District 27J

THORNTON, CO 80602

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Upcoming Events

Oct

Fri

End of First QuarterEventDistrict-wide

39 Days

Nov

Mon

Thanksgiving BreakBreakDistrict-wide

Banks, government offices, and schools may be closed.

Dec

Mon

Winter BreakBreakDistrict-wide

Jan

Fri

Finals/Assessment/Data Day Pk-12 & TLCexamDistrict-wide

Jan

Fri

End of First SemesterEventDistrict-wide

Q2 - 35 Days

Jan

Sat

Finals/Assessment/Data Day Pk-12 & TLCexamDistrict-wide

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School Profile

Grades

9–12

Enrollment

1,636

Student:Teacher

21.2:1

Locale

Suburban

District

School District 27J

Econ. Disadvantaged

39.4%

Phone

(303)655-6800

School Statistics

Academics (SY 2020-21)

ELA Proficiency

50%

39th percentile in CO

Math Proficiency

22%

33th percentile in CO

Graduation Rate

90-94%

Chronic Absenteeism

17.2%

SY 2019-20

Programs & Activities (SY 2021-22)

AP Program

12 courses offered

378 students enrolled

Gifted & Talented

67 students enrolled

Dual Enrollment

73 students enrolled

SAT/ACT

265 test takers

Athletics

15 sports, 32 teams

468 participants

Student-Teacher Ratio: 26.2:1

Worse than average in CO

Technology & Internet Access (SY 2021-22)

Wi-Fi

Campus-wide wireless

Fiber Internet

High-speed connection

405

Connected devices

Staff & Support Services (SY 2021-22)

Teachers (FTE)

88% fully certified

Counselors

Psychologists

Social Workers

Nurses

School Resource Officers

Security Staff

Anti-Bullying Policy

District Finance (FY 2023)

Per-Pupil Spending

$10,854

Total current expenditure

Instruction Spending

$5,886

Per pupil, classroom only

Total Revenue/Pupil

$15,408

All funding sources

Funding Sources

Federal 6%State 45%Local 49%

District-level data from NCES F-33 Survey

Community Context

Median Home Value

$566,588

-3.2% 1yr+18.0% 5yr

Denver, CO metro area

Community Need Level

Elevated

CDC/ATSDR Social Vulnerability Index 2022

Neighborhood Indicators (Census Tract)

16.9%

Below 150% poverty line

4.7%

Unemployment rate

10.8%

Uninsured residents

15.6%

No HS diploma (25+)

Enrollment Trend (2014-2025)

1,784

Current enrollment

Growing(+101% 5yr)

Coming Up

Fri, Oct 23, 2026

End of First Quarter

39 Days

Event

Mon, Nov 23, 2026

Thanksgiving Break

Banks, government offices, and schools may be closed.

Break

Mon, Dec 21, 2026

Winter Break

Break

Full School Calendar 2026-27

Events marked District-wide apply to all schools in School District 27J. Riverdale Ridge High School follows the district calendar.

Date	Event	Type	Level
Tue, Sep 8, 2026	Assessment Day (PK-8)District-wide	Staff Day	—
Fri, Oct 23, 2026	End of First QuarterDistrict-wide 39 Days	Event	—
Mon, Nov 23, 2026	Thanksgiving BreakDistrict-wide	Break	—
Mon, Dec 21, 2026	Winter BreakDistrict-wide	Break	—
Fri, Jan 15, 2027	Finals/Assessment/Data Day Pk-12 & TLCDistrict-wide	exam	—
Fri, Jan 15, 2027	End of First SemesterDistrict-wide Q2 - 35 Days	Event	—
Sat, Jan 16, 2027	Finals/Assessment/Data Day Pk-12 & TLCDistrict-wide	exam	—
Tue, Jan 19, 2027	Second Semester BeginsDistrict-wide	Event	—
Fri, Mar 19, 2027	End of 3rd QuarterDistrict-wide 36 Days	Event	—
Mon, Mar 22, 2027	Spring BreakDistrict-wide	Break	—
Thu, Jun 3, 2027	Finals Make-Up Day (High School & TLC)District-wide	exam	—
Thu, Jun 3, 2027	Last Day of School (Preschool & K-12)District-wide Q4, 39 Days	Event	—