The first 306 registrants will have their fee covered by the 2020 “Pay it Forward Campaign.”

Please click the link below to start registration. As the system is new this year, please e-mail ( or call (314-529-1329) the Executive Director with any and all questions.


The 2020 Fair is being held the week of March 14-21. Please visit the “Events” tab to see the entire week’s schedule.

The Mastodon Art/Science Regional Fair is a 501(c)3 non-profit organization that supports students, teachers, and parents to reach the goal to explore, promote, inspire, and support student art and science projects in our regional competition held annually in March at Jefferson College in Hillsboro, MO.
Broadcom MASTERS Information Quick Link
GENIUS Olympiad Information Quick Link
ISEF Information Quick Link
Rules Quick Link (Suggested Reading for those NEW to the Fair)
Science Safety Form PDF Quick Link


To offer your assistance in any way, or if you have any questions, please contact Executive Director, Samantha DeClue, at or by phone at 314-529-1329.


**Thank you for your patience as we are working on updating our website. We appreciate your patience during this process.


All donations are tax deductible, as the Mastodon Fair is a 501(c)3 non-profit organization. Please make checks payable to: Mastodon Fair. Our mailing address is: Mastodon Fair, 1000 Viking Drive, Hillsboro, MO 63050.