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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

Trick or Treat Street

Trick or Treat Street

Date & Time: Wed, 10/27/2021 - 5:00pm to 7:00pm

Trick or Treat street on Wednesday, October 27 from 5-7pm

10/27/2021 - 5:00pm
Oct 27

Senior Yearbook Ad Due

Senior Yearbook Ad Due

Date & Time: Mon, 11/15/2021 (All day)

Type: school only Opponent:

11/15/2021 (All day)
Nov 15

High School Information Night

High School Information Night

Date & Time: Mon, 11/15/2021 - 6:00pm to 8:30pm
Location: Adams 12 Education Support Center (ESC)

Type: school only Opponent:

11/15/2021 - 6:00pm
Nov 15

Upcoming Sports

Soccer: Boys JV Game vs Arvada (Home)

Soccer: Boys JV Game vs Arvada (Home)

Date & Time: Mon, 10/18/2021 - 4:30pm
Location: Thornton High School

Type: nonconference Opponent: Arvada

10/18/2021 - 4:30pm
Oct 18

Picture Retakes

Picture Retakes

Date & Time: Tue, 10/19/2021 - 7:45am to 12:00pm

Type: school only Opponent:

10/19/2021 - 7:45am
Oct 19