Missoula Area
http://hs.umt.edu/mtsciencefair/
Billings Area
https://www.msubillings.edu/scienceexpo/
Intermountain Junior Science and Humanities Symposium (a regional competition)
https://www.jshs.org/region/intermountain/
Great Falls STEAM Expo
(website not live for 2020)
Big Sky High School Regional Science Bowl
https://science.osti.gov/wdts/nsb/Regional-Competitions/High-School-Regionals/MT_Big-Sky-Regional-High-School-Science-Bowl
Science Olympiad Bozeman
http://www.montana.edu/smrc/mtso/