Connecting, supporting, and empowering

science educators

throughout Colorado.


Note:  If you are already a member and would like to access and print a membership card or update your contact information, click on "Edit your member profile" once you have logged on.

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Why join CAST?

You'll find lots of reasons to join our statewide network of science educators. CAST exists to support, stimulate and improve science education at all levels. As a member, you'll have access to resources for professional development, opportunities for your students, classroom activities, grant opportunities, CAST-specific awards and grants, and discounts on certain programs.


Your CAST membership includes:

Professional Development Opportunities and Networking.  As a member, you'll learn about professional development opportunities through our website and social media (Facebook and Twitter.)  In addition to learning new science content, teaching strategies, and classroom activities, attending science workshops will provide many opportunities to network with fellow science teachers and other science professionals. Rural CAST members may apply for scholarships up to $100 to attend the Colorado Science Convention. 

CAST Classroom Mini-Grants.  After 1 year of membership, CAST members can apply for classroom mini-grants.  These grants are for up to $200 maximum and can be used for non-consumable science materials and/or innovative activities.

CAST Awards. CAST members have the opportunity to be recognized and to nominate Colorado teachers for excellence in science education.

Friends of CAST Benefits. CAST has developed partnerships with the following organizations that give free or reduced membership, free admission and/or discounted educational programs to show support for CAST members.

The Denver Museum of Nature and Science is among the foremost natural history museums in the US. DMNS is a leader in scientific research and a premier source of informal science education for people of all ages. The mission of DMNS is to be a catalyst that ignites our community’s passion for nature and science. DMNS offers the community permanent and temporary exhibits and diorama halls, a Giant Screen Infinity Theatre, planetarium shows, and diverse education programs and experiences for all ages. CAST members receive a FREE Individual Membership to DMNS, or a 30% discount on other membership packages, and 10% discount in the DMNS gift shop. CAST members can click the members only tab in the black box above to access the form.

Free individual membership to Dinosaur Ridge in Morrison includes guided shuttle tour for 2 people, free admission to Trek Through Time for 2 people, free guided Shuttle Bus Tours,  and a 10% discount in the gift shop, access to Quarterly Newsletter and Annual Report, and monthly Emailed Newsletter (E-tracks). For only $20 you can upgrade to a family membership and receive admission & shuttle tour for 4 people.

The membership form for Dinosaur Ridge is found by clicking the Members Only tab in the black box above.

Walking Mountains Science Center provides locals and visitors from pre-k to gray with opportunities to explore nature, gain a scientific understanding, and learn about the many wonders of our mountain environment through natural science and sustainability programs. CAST members receive FREE entrance to any Walking Mountain Facility - including Vail Nature Center, Nature Discovery Center (Vail Mountain), Walking Mountains Science Center Campus (Avon). To access this benefit the CAST member just needs to show their membership card at the facility.

The goal for the Eureka!  McConnell Science Museum in Grand Junction is to make the basic elements of science and mathematics available for students and adults to investigate hands-on. The majority of the stations and exhibits have been constructed by several of our volunteers. EUREKA! hopes to redefine the way people think about, learn about, and interact with science and technology by making it fun for everyone. Free family membership to the museum includes access to EUREKA! for 2 adults and 4 children. To access this benefit the CAST member just needs to show their membership card at the museum.

The mission of the Space Foundation Discovery Center in Colorado Springs is to inspire, educate, connect and advocate for the global space community.  "The Space Foundation Discovery Center is the region's first and only dedicated space, science and technology center. It is an interactive, education-focused destination that advances science, technology, engineering, art and mathematics (STEAM) in the exciting context of space exploration, development and utilization."  The Space Foundation offers free, unlimited individual admission (must present your CAST membership card) to the Discovery Center, plus a 10% discount on purchases from the gift shop.

The Rocky Mountain Association of Geologists (RMAG) is a nonprofit organization whose purpose is to promote continued interest in geology, allied sciences, and their practical application, as well as to foster scientific research, and to encourage fellowship and cooperation among its members.  RMAG, through its educational outreach programs, also provides resources to K-12 teachers in Colorado.  RMAG is providing a 55% individual discount to CAST members ($20/year).  To join, RMAG you must fill out the required benefits form (found by clicking the Members Only tab in the black box above) and mail it in, call the RMAG at 800-970-7624 ext. 102 or email

The Rocky Mountain Association of Geologists also donated $500.00 to the Colorado Association of Science Teachers!

The Colorado Consortium for Earth and Space Science Education (Challenger Learning Center of Colorado) is an educational nonprofit organization specializing in hands-on STEM programs and simulated space missions for students across the state of Colorado, as well as science and astronomy events for the general public.  The Challenger Learning Center is offering CAST members a discount of $100/program.  To access this discount you will need to call 719-598-9755 or register in person. 

The Butterfly Pavilion is the first stand-alone accredited non-profit invertebrate zoo in the world.  It provides hands-on learning experiences in the exhibits and educational programs, conducts new research that sets the standard for zoos across the country while building innovative solutions for species and habitat conservation in countries around the world.  Butterfly Pavilion is leading the way in ensuring invertebrates are protected for the future.  The Butterfly Pavilion is offering a CAST member a free individual annual membership

Your CAST membership helps sponsor these activities...

CAST sponsors several student science activities each year:

  • Colorado State Science and Engineering Fair  - CAST gives 2 $150 awards to deserving teachers who worked with students to prepare for CSEF each year.   This event will take place in April 2025. CAST is in need of several volunteers to help judge on Thursday, April 10th. Please email Linda Cummings if you would like to be involved!

So.....what are you waiting for?  Join CAST today!!

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.  


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

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