Connecting, supporting, and empowering science educators

throughout Colorado.



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 Congratulations to Dr. Yajaira Fuentes-Tauber,

CAST Region I Secondary Director



NSTA’s Robert E. Yager Exemplary Teaching Awardee

for District XIV !!





Congratulations to Autumn Rivera, CAST President-Elect

Association for Middle Level EducationTeacher of the Year!


Colorful balloons and word congratulations






2023 CAST Pre-Service Teaching Award Winners





Get connected!


Join the Colorado Science Teachers FB Group - click on the image below! 

Important Posted Links

Did you know...

A group of science teachers first met to organize CAST in April of 1957.  Over 100 teachers met and the dues were $1.  

Why Join CAST? 

Join our statewide network of science educators! As a member, you'll have access to resources for professional development, opportunities for networking, CAST-specific awards and grants, and discounts with our friends of CAST. 

For more details or to join, view the "Membership" page 

Platinum Partner


Silver Partner



Bronze Partner


Friends of CAST

Friends of CAST provide opportunities, programs, and resources for CAST members across the state. The science organizations below are current Friends of CAST.

Click on any of the logos below to explore the websites of these important organizations.

Attention, Colorado Science Organizations!

If you are interested in becoming a Friend of CAST to connect with our 400+ members across the state and provide support and materials to Colorado’s science educators, please fill out our Friend of CAST inquiry form linked below. Contact our Informal Education Chair if you have any questions.

Friends of CAST Inquiry Form




Western Museum of Mining & Industry





Colorado Gators Reptile Park


History Colorado logo


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CAST is the Colorado affiliate of the National Science Teaching Association, NSTA. 

NSTA's Home Page

NSTA's Publications and Freebies


For membership information: CAST Secretary

For billing/invoice information: CAST Treasurer

For website information:  CAST Webmaster

Colorado Association of Science Teachers is a 501(c)6 non-profit organization


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