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Welcome to Thornton High School

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 Hours7:00 am - 3:30 pm
School Hours7:15 am - 3:00 pm
Early Release
7:10am - 12:30pm

Upcoming Events

President's Day - No School

President's Day - No School

Date & Time: Mon, 02/18/2019 (All day)
Location: Field House

02/18/2019 (All day)
Feb 18

Spring Sports Season Begins

Spring Sports Season Begins

Date & Time: Mon, 02/25/2019 (All day)
Location: Field House

02/25/2019 (All day)
Feb 25

8th grade Informational Night

8th grade Informational Night

Date & Time: Tue, 03/05/2019 - 6:00pm to 7:30pm
Location: Field House

03/05/2019 - 6:00pm
Mar 5

End of 3rd Quarter

End of 3rd Quarter

Date & Time: Fri, 03/15/2019 (All day)
Location: Field House

03/15/2019 (All day)
Mar 15

Oral History Day

Oral History Day

Date & Time: Thu, 03/21/2019 (All day)
Location: Field House

03/21/2019 (All day)
Mar 21

Upcoming Sports