- FIRST Lego Robotics (season registration/activities begin in August, events through April/May)
- Computational Linguistics Olympiad (registration from September; event January)
- USA Biology Olympiad (registration from September, initial event January)
- US Chemistry Olympiad (registration from September, local events in March)
- National History Bee (Ind) & Bowl (Team) (registration from September, regionals Feb/March, nationals May/June)
- American Mathematics Competition (MS registration Oct / event Nov; HS registration Dec / event Jan)
- Regeneron Science Talent Search (registration due November)
- Speech and Debate (events from late fall; state late January/early Feb)
- Montana MathCounts (registration deadline December, local events in February, state in March)
- Destination Imagination (register by Dec-Jan, state tournament in April)
- Academic Decathlon for HS - Pentathlon for MS (nationals in April)
- US Chess Federation (events ongoing)
- Citizen science projects (events ongoing)
- Camp Invention (summer STEM programs)