Thank you for your patience as we are working on updating our website. As the process continues please send any information regarding errors or outdated page URLs to We appreciate your assistance and patience during this lengthy process.


To print your registration forms, please go to: Online Registration

Labels will be available at Project Check-In, they will not be available to print prior to the Fair.

If you still wish to register a project, please contact Executive Director, Samantha DeClue via E-mail at or via Fair Cell Phone at 314-529-1329.


Click Here for 40th Anniversary Shirt/Hoodie Order Form!


FAIR WEEK SCHEDULE – Jefferson College Field House in Hillsboro, MO

Tuesday, March 19: Project Check-In and Placement 9 a.m. – 7 p.m.
Art Portfolios Due by 7 p.m.  No Late Entries!

Wednesday, March 20: Judging Day! Closed to the Public.
Judges Needed for 1-2 hours between 9 a.m. – 8 p.m. Sign up today.
Art Scholarship and International Science Competition Interviews 5 – 7:30 p.m.

Friday, March 22: Public Viewing 10 a.m. – 5 p.m.

Saturday, March 23: STEAM Expo! 12 – 6 p.m., FREE and Open to the Public! Lots of art and science events, hands-on experiences, and open project viewing!

Grand Awards Ceremony! 6 p.m. All student participants will walk in the opening ceremony and receive recognition medallions. Over 200 awards and scholarships will be presented!



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.

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.

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