St. Louis Astronomical Society

Mastodon Fair

Saturday, March 21, 2026

Event

The St. Louis Astronomical Society and DarkSky Missouri will host a booth at the Mastodon Fair.

The Mastodon Fair is a 501(c)3 non-profit organization that supports students, teachers, parents, and the community in the development of the creative and scientific process to submit creative and novel projects in the annual regional competition held each March at Jefferson College in Hillsboro, MO; along with hosting community events to expand creativity and knowledge.

Date: Saturday, March 21, 2026

Time: noon - 3 p.m. Central

Location: Jefferson College Field House
1000 Viking Dr
Hillsboro, MO 63050

Information for Visitors
Instructions for the Public:

The St. Louis Astronomical Society and DarkSky Missouri will host a booth at the Mastodon Fair.

The Mastodon Fair is a 501(c)3 non-profit organization that supports students, teachers, parents, and the community in the development of the creative and scientific process to submit creative and novel projects in the annual regional competition held each March at Jefferson College in Hillsboro, MO; along with hosting community events to expand creativity and knowledge.

Location Details

Jefferson College Field House
1000 Viking Dr
Hillsboro, MO 63050
(click to get directions)
check weather forecast

UPCOMING EVENTS

Wed 4/8/2026
6 p.m. - 8 p.m. Central 		Ladue School District STEAM FEST Ladue Horton Watkins High School
1201 South, Warson Rd Saint Louis, MO
Fri 4/10/2026
8 p.m. - 10 p.m. Central 		John Burroughs School Star Party
Sat 4/11/2026
7:30 p.m. - 9:30 p.m. Central 		St. Louis WOW School at Beaumont Scout Reservation Beaumont Scout Reservation
6480 Beaumont Reservation Dr, High Ridge, MO 63049 Pacific, MO
Sat 4/11/2026
7 p.m. - 10 p.m. Central 		Bellefontaine Cemetary Star Party Bellefontaine Cemetary
4947 W. Florissant Avenue St. Louis, MO