ACSLAmerican Computer Science League
Regular season Contest 2 · Jan 5 – Mar 1, 2026
2026–2030 calendar
Competition calendar
Tech competitions highlighted (⚡), science olympiads, hackathons and more. Filter by age and click an event for details.
⚡ Upcoming tech dates
48h HackathonsMLH GHWOnline hackathon weekNov 6–12, 2026happening now</> ProgrammingBebrasWorld-Wide Bebras Week of computational thinkingNov 9–13, 2026happening now🔐 CybersecurityCSAWCSAW Cybersecurity Games Global FinalsNov 12–14, 2026in 2 days48h HackathonsJunctionHackathon (48 h)Nov 13–15, 2026in 3 days
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Long registration periods appear only on the days they open and close.
This month's competitions
March 2026
8 dates
ACSLAmerican Computer Science League
Regular season Contest 3 · Feb 2 – Apr 5, 2026
Scratch OlympiadInternational Scratch Creative Programming Olympiad
Registrations and project submission – Selection stage · Mar 1 – Jun 30, 2026
ACSLAmerican Computer Science League
Regular season Contest 4 · Mar 2 – May 17, 2026
Reply ChallengeReply Challenges (Code & Cyber Security)
Hack the Code Challenge (Standard and Teen editions) · Mar 12, 2026
OBIBrazilian Olympiad in Informatics
Registration – Introductory category · Mar 25 – May 26, 2026
OBIBrazilian Olympiad in Informatics
Registration – Programming category (reopened until 17/06 for Session B) · Mar 25 – Jun 17, 2026
USACOUSA Computing Olympiad
US Open – Season championship contest · Mar 27–30, 2026
Confirmed: official days · Month announced: days to be confirmed · Estimate: the month it is usually held, not announced yet · No forecast: date unknown.
Dates checked on the organizers' official websites and calendars (last review on November 6, 2026). They may change: always confirm on the official website before registering or traveling.