Riverdale Ridge High School

School District 27J

Thornton, Colorado

1,463 students

High School, Grades 9–12

(303)655-6800 School Website

1,463

Students

24.2:1

S:T Ratio

School Snapshot

Key metrics at a glance

Avg SAT Score

1,090

out of 1600

Average

Avg ACT Score

out of 36

Average

AP Courses

A-

courses offered

Good

AP Enrollment

26%

of students

Good

Student-Teacher Ratio

24:1

C+

students per teacher

Below Avg

Graduation Rate

88%

Excellent

This Week at Riverdale Ridge – September 21, 2026

188 students practicing on Varsity Tutors

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students

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ACT Prep

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MATH

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Science

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Academic Grades

Select a grade level to explore courses and resources

Academic Resources

Typical courses and practice resources for students at Riverdale Ridge High School

Biology

Cell biology, genetics, evolution, and ecology

AP Biology

College-level biology with lab component

Chemistry

Atomic structure, reactions, and stoichiometry

AP Chemistry

College-level chemistry with lab component

Physics

Mechanics, waves, electricity, and magnetism

AP Physics 1

Algebra-based mechanics and waves

Environmental Science

Ecosystems, human impact, and sustainability

AP Environmental Science

College-level environmental science

World History

Global civilizations from ancient to modern times

AP World History

College-level world history analysis

U.S. History

American history from colonization to present

AP U.S. History

College-level American history

Standardized Test Dates

Upcoming national, state, and school calendar dates that affect students at Riverdale Ridge High School.

National Tests

August 1, 2026 – November 30, 2026

ISEE — Fall Testing Season

Testing window

August 3, 2026 – June 30, 2027

SSAT — Flex Testing

Testing window

September 22, 2026

SAT — National

Late registration deadline

September 25, 2026

SAT — National

Score release

September 29, 2026

ACT — National

Late registration deadline

October 1, 2026 – October 30, 2026

PSAT 8/9 — Fall

Testing window

+66 more national tests this school year

State Assessments

January 11, 2027 – February 12, 2027

WIDA ACCESS

Testing window

January 11, 2027 – February 12, 2027

WIDA Alternate ACCESS

Testing window

April 5, 2027 – April 23, 2027

CMAS

Testing window

April 5, 2027 – April 23, 2027

CoAlt

Testing window

See the full national test & school calendar

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School Details

Address

13380 Yosemite Street, Thornton, CO 80602

Phone

(303)655-6800

Website

Visit Website

District

School District 27J

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