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Welcome to Thornton High School

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An International Baccalaureate Diploma Programme School

Thornton High School's International Baccalaureate Programme provides opportunities, expectations and support for each student to become a knowledgeable, open-minded, active, and caring citizen of an ever-changing world. To this end, the programme challenges students to think critically, develop respect for different points of view, and embrace a lifelong journey of learning, hard work and academic excellence.


Total Commitment to High Achievement and Success for All.


Thornton High will be a high performing school that provides a continuum of learning for IB students along the Thornton corridor, THS will provide an environment that promotes:

  • A viable authentic curriculum
  • Personalization of the learning experience for every student
  • In an atmosphere of democratic decision-making

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Address9351 N Washington Street
Thornton, CO
Office Phone720-972-4800
Fax Number720-972-4999
Office Hours7:00am - 3:30pm
School Hours7:45am - 3:30pm
Early Release
7:45am - 12:30pm

Upcoming Events

ACCESS Testing Window Closes

ACCESS Testing Window Closes

Date & Time: Fri, 02/11/2022 - 7:45am to 3:30pm

Type: school only Opponent:

02/11/2022 - 7:45am
Feb 11

Parent Teacher Conferences

Parent Teacher Conferences

Date & Time: Thu, 02/17/2022 - 6:00pm to 8:00pm

Type: school only Opponent:

02/17/2022 - 6:00pm
Feb 17

No School - In service

No School - In service

Date & Time: Fri, 02/18/2022 - 7:00am

In service - no school for students

02/18/2022 - 7:00am
Feb 18

President's Day - No School

President's Day - No School

Date & Time: Mon, 02/21/2022 - 7:45am to 3:30pm

Type: school only Opponent:

02/21/2022 - 7:45am
Feb 21

Upcoming Sports

Basketball: Girls C Game vs Denver North (Away)

Basketball: Girls C Game vs Denver North (Away)

Date & Time: Wed, 01/19/2022 - 4:00pm
Location: Denver North High School

Type: nonconference Opponent: Denver North

01/19/2022 - 4:00pm
Jan 19