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Johnston Community School District
Johnston Senior High School

Johnston Community School District

Johnston Senior High School

Johnston, Iowa

1,790 students

High School, Grades 10–12

(515)278-0449School Website

#6

Best ACT in Iowa High Schools

1,790

Students

19.9:1

S:T Ratio

School Snapshot
Key metrics at a glance
Avg SAT Score

1,360

A

out of 1600
Excellent
Avg ACT Score

27

A

out of 36
Excellent
AP Courses

17

A

courses offered
Excellent
AP Enrollment

27%

C

of students
Good
Student-Teacher Ratio

20:1

B-

students per teacher
Average
Graduation Rate

97%

A+

Excellent
Reading Proficiency

83%

A

Excellent
Math Proficiency

79%

A-

Good
This Week at Johnston Senior – September 22, 2026

237 students practicing on Varsity Tutors

SAT Prep

1

A

B

C

D

2

A

B

C

D

3

A

B

C

D

4

A

B

C

D

5

A

B

C

D

1520

0

students

Start practicing →
ACT Prep

36

ENG

MATH

READ

SCI

0

students

Start practicing →
Math

0

students

Start practicing →
English

0

students

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Science

0

students

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Explore practice resources for Johnston Senior students
Academic Grades

Select a grade level to explore courses and resources

10
Grade
11
Grade
12
Grade
Academic Resources

Typical courses and practice resources for students at Johnston Senior High School

Biology
9

Cell biology, genetics, evolution, and ecology

AP Biology
AP

College-level biology with lab component

Chemistry
9

Atomic structure, reactions, and stoichiometry

AP Chemistry
AP

College-level chemistry with lab component

Physics
9

Mechanics, waves, electricity, and magnetism

AP Physics 1
AP

Algebra-based mechanics and waves

Environmental Science
9

Ecosystems, human impact, and sustainability

AP Environmental Science
AP

College-level environmental science

World History
9

Global civilizations from ancient to modern times

AP World History
AP

College-level world history analysis

U.S. History
9

American history from colonization to present

AP U.S. History
AP

College-level American history

Standardized Test Dates

Upcoming national, state, and school calendar dates that affect students at Johnston Senior 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

September 14, 2026 – October 30, 2026

Dynamic Learning Maps (DLM) — Phase 1

Testing window
IA

November 2, 2026 – December 18, 2026

Dynamic Learning Maps (DLM) — Phase 2

Testing window
IA

February 1, 2027 – March 26, 2027

Alt ELPA Summative

Testing window
IA

February 1, 2027 – March 26, 2027

Dynamic Learning Maps (DLM) — Spring Phase 1

Testing window
IA

February 1, 2027 – March 26, 2027

ELPA21 Summative

Testing window
IA

March 29, 2027 – May 21, 2027

Dynamic Learning Maps (DLM) — Spring Phase 2

Testing window
IA
See the full national test & school calendar
After Johnston Senior High
Where graduates go and what they study
Popular Colleges
1

University of Iowa

2

Iowa State University

3

University of Northern Iowa

4

Des Moines Area Community College

5

Drake University

6

Grand View University

7

University of Chicago

8

Simpson College

Popular Majors
1

Business

2

Psychology

3

Biology

4

Pre-Medicine Studies

5

Nursing

6

Computer Science

7

Chemistry

8

Marketing

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1:1 Tutoring

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School Details
Address

6500 Nw 100th Street, Johnston, IA 50131

Phone

(515)278-0449

Website

Visit Website

District

Johnston Community School District

Teachers & Staff
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Other Schools in District
Johnston Senior High School
Henry A Wallace Elementary School
Horizon Elementary
Lawson Elementary School
Timber Ridge Elementary
Johnston Middle School