Mullen High School is a private, co-educational school in southwest Denver which provides a Catholic, college-prep curriculum since 1931.
Our Lasallian philosophy of educating is dedicated to exemplary teaching, scholastic rigor and outstanding care for all students.
Quick Facts (2025-26)
- Top Ranked CO School
- Grades: 9-12
- Enrollment: 860 students
- Yearly Tuition: $20,475
- Acceptance rate: 96%
- Average class size: 20 students
- Application Deadline: Dec. 14 / rolling
- Source: Verified school update
Upcoming Events
Top Rankings
Mullen High School ranks among the top 20% of private schools in Colorado for:
Category
Attribute
Student Body
AP Courses
Sports offered
School History
School Overview
School Membership(s)School Assoc.
Religious Affiliation
Grades Offered
Grades 9-12
Year Founded
1931
Colors
Navy Blue, Gold
Last Day of School
Fri. May 29, 2026
Student Body
Total Students
860 students
Student Body Type
Co-ed
% Students of Color
37%
State avg.: 25%
Students by Grade

Academics and Faculty
Total Classroom Teachers
78 teachers
Student-Teacher Ratio
11:1
National avg.: 13:1
% Faculty w/Advanced Degree
33%
Average Class Size
20 students
Number of AP Courses
19 courses
List of Courses Offered
Classroom Dress Code
Casual
Mullen embroidered Polos, khaki or navy bottoms
Tuition and Acceptance Rate
Admission Deadline
Dec. 14 / rolling
Yearly Tuition Cost
$20,475
Tuition Notes
Includes the $400 registration fee.
% on Financial Aid
38%
Acceptance Rate
96%
National avg.: 81%
Admissions Director
Lindsay Hooper
Admissions Associate
Natalie Paul '20
Application URL
Sports
Total Sports Offered
18 sports
School Notes
- School Mascot: Mustangs
- Mullen High School is a private, co-educational school in southwest Denver which provides a Catholic, college-prep curriculum since 1931. Our Lasallian philosophy of educating is dedicated to exemplary teaching, scholastic rigor and outstanding care for all students.
- Sample of notable school alumni/alumnae:
- JK Scott '14 - Punter for the LA Chargers
Source: Verified school update
Frequently Asked Questions
How much does Mullen High School cost?
Mullen High School's tuition is approximately $20,475 for private students.
What is the acceptance rate of Mullen High School?
The acceptance rate of Mullen High School is 96%, which is higher than the national average of 84%.
Who are famous alumni from Mullen High School?
Mullen High School famous alumni include: JK Scott '14.
What sports does Mullen High School offer?
Mullen High School offers 18 interscholastic sports: Baseball, Basketball, Cheering, Cross Country, Dance, Diving, Flag Football, Football, Golf, Ice Hockey, Lacrosse, Soccer, Softball, Swimming, Tennis, Track and Field, Volleyball and Wrestling. Mullen High School is ranked as one of the top 20% of private schools in Colorado for most sports offered.
What is Mullen High School's ranking?
Mullen High School ranks among the top 20% of private schools in Colorado for: Largest student body, Most AP courses offered, Most sports offered and Oldest founding date.
When is the application deadline for Mullen High School?
The application deadline for Mullen High School is Dec. 14 / rolling (applications are due on Dec. 14 but additional applications are reviewed year-round as space permits ).
In what neighborhood is Mullen High School located?
Mullen High School is located in the Fort Logan neighborhood of Denver, CO.
School Calendar
View the Mullen High School yearly calendar below. Note key dates such as:
Event
Date
Thanksgiving Break - School Closed
November 24, 2025 (Monday)
Thanksgiving Break - School Closed
November 25, 2025 (Tuesday)
Thanksgiving Break - School Closed
November 26, 2025 (Wednesday)
Thanksgiving Break - School Closed
November 27, 2025 (Thursday)
Thanksgiving Break - School Closed
November 28, 2025 (Friday)
School Reviews
5 10/7/2020
Mullen High School has been doing an incredible job accommodating the students and teachers during the COVID 19 pandemic. It has been tough, but I appreciate the work they are doing to keep us safe and bringing our community back together.
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