Our website is currently being updated.
If you find any outdated information, we apologize and are working to get it updated. In the meantime, please help by e-mailing outdated page URLs to director@nullmastodonfair.org. We appreciate your assistance and patience during this project.

The 40th Anniversary Mastodon Fair is being held the week of March 19-23. We will again be at the Jefferson College Field House 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


November 30, 2018: Science Safety Paperwork Due for projects being entered to compete in International Events: ISEF (9th-12th), Genius Olympiad (9th-12th), and Broadcom MASTERS (5th-8th Only).  If you have not submitted your paperwork by the deadline, please contact sciencedirector@nullmastodonfair.org to see if accommodations can be made.  See www.mastodonfair.org for forms and more details. Contact director@nullmastodonfair.org with questions.


January 2: Online Registration Opens at 12:01 a.m.

February 18: Online Registration Closes at 11:59 p.m.

March 1: Digital Art Projects Due.

Mail to: Mastodon Fair
1000 Viking Drive
Hillsboro, MO 63050

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 – 8 p.m. All educator and student participants walk in the opening ceremony and receive recognition medallions. Numerous awards and scholarships are presented!


To offer your assistance in any way, or if you have any questions, please contact Executive Director, Samantha DeClue, at director@nullmastodonfair.org 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.

Please keep up with what is happening by following us on Facebook.