Mastodon Fair will be held March 19th-23rd, 2019!

The Mastodon Fair will be held the week of March 19-23, 2019 at Jefferson College Field House in Hillsboro, MO.


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, contact the to see if accommodations can be made.  See for forms and more details. Contact with questions.


January 2, 2019: Online Registration Opens at 12:01 a.m.

February 18, 2019: Online Registration Closes at 11:59 p.m.

March 1, 2019: Digital Art Projects Due.

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

Tuesday, March 19, 2019: Project Check-In and Placement 9 a.m. – 7 p.m. Art Portfolios Due by 7 p.m.  No Late Entries!

Wednesday, March 20, 2019: 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, 2019: Public Viewing 10 a.m. – 5 p.m.


Saturday, March 23, 2019: 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!

This 2019 Mastodon Fair will be run totally by volunteers. To offer your assistance in any way, please email: or contact the Fair’s volunteer Executive Director, Samantha DeClue,  at 314-529-1329.

Donations are tax deductible as Mastodon Fair is a 501(c)3 non-profit organization.  Checks made payable to Mastodon Fair and mailed to: Mastodon Fair, 1000 Viking Drive, Hillsboro, MO 63050.

Get the latest information by following our Facebook page.

Mastodon Fair Endowment Fundraiser Wine Sale
Mastodon Fair GuideStar Profile