This page is a permanent record of every hackathon that has closed. These are kept here for reference — many hackathons run annually and may reopen next cycle.
Back to active hackathons: README
| Status | Host | Hackathon | Format | Location | Application | Date Posted |
|---|---|---|---|---|---|---|
| 🔒 [CLOSED] | ETHGlobal | ETHOnline 2026 — Sep 4–16, 2026 (Async Online Hackathon; Apply to Attend; Approval Required) | Virtual | Online | 🔒 | Sep 02, 2026 |
| 🔒 [CLOSED] | OpenAI | The WebMCP Challenge — Aug 25 – Sep 3, 2026 (Online Hackathon; Registration Open) | Virtual | Online | 🔒 | Sep 02, 2026 |
| 🔒 [CLOSED] | Junction | Junction 2026: European Tech Renaissance — Nov 13–15, 2026 (48-Hour Hackathon; Applications Open) | In-Person | Espoo, Finland | 🔒 | Sep 02, 2026 |
| 🔒 [CLOSED] | Revivals Egypt | RePlay Alexandria: Shipaton Edition — Sep 5, 2026 (4-Hour Build Sprint; Applications Open) | In-Person | Alexandria, Egypt | 🔒 | Sep 02, 2026 |
| 🔒 [CLOSED] | Hack Club | Stardance | Virtual | Online | 🔒 | Aug 27, 2026 |
| 🔒 [CLOSED] | Peddie Computer Science Club | PeddieHacks 2026 — Aug 14–16, 2026 | Virtual | Online | 🔒 | Aug 09, 2026 |
| 🔒 [CLOSED] | IBM | IBM Dev Day: Bob in Action + Hackathon — Aug 27–30, 2026 | Virtual | Online | 🔒 | Aug 09, 2026 |
| 🔒 [CLOSED] | Pasteur Labs | Tesseract Hackathon 2026 | Virtual | Online | 🔒 | Aug 05, 2026 |
| 🔒 [CLOSED] | OregonHacks | OregonHacks 2026 | Virtual | Online | 🔒 | Jul 30, 2026 |
| 🔒 [CLOSED] | Pixel Forge | Pixel Forge AI Hackathon | Virtual | Online | 🔒 | Jul 30, 2026 |
| 🔒 [CLOSED] | Stellic | The Pathfinders Challenge | Virtual | Online | 🔒 | Jul 27, 2026 |
| 🔒 [CLOSED] | HopHacks | HopHacks 2026 (Student Hackathon; Applications Open) | In-Person | Baltimore, MD | 🔒 | Jul 20, 2026 |
| 🔒 [CLOSED] | Stanford | TreeHacks 2026 — Feb 13–15, 2026 | In-Person | Stanford, CA | 🔒 | Jul 17, 2026 |
| 🔒 [CLOSED] | localhost:nyc | Checkout: The Travel & Hospitality Hackathon — Aug 9, 2026 | In-Person | New York, NY | 🔒 | Jul 12, 2026 |
| 🔒 [CLOSED] | OnlyExit Hacker House | Hack Your Way Into the Hacker House — Jul 18, 2026 | In-Person | New York, NY | 🔒 | Jul 12, 2026 |
| 🔒 [CLOSED] | OpenAI | OpenAI Build Week: Join a global week of building with Codex — Jul 13–21, 2026 | Virtual | Online | 🔒 | Jul 11, 2026 |
| 🔒 [CLOSED] | DataHub | Build with DataHub: The Agent Hackathon — Jul 6– Aug 10, 2026 | Virtual | Online | 🔒 | Jul 11, 2026 |
| 🔒 [CLOSED] | Cockroach Labs | CockroachDB × AWS Hackathon — Build with Agentic Memory — Jun 30– Aug 18, 2026 | Virtual | Online | 🔒 | Jul 11, 2026 |
| 🔒 [CLOSED] | Africa Deep Tech Foundation | Africa Deep Tech Challenge 2026 — The Laptop LLM Challenge | Virtual | Online | 🔒 | Jul 11, 2026 |
| 🔒 [CLOSED] | DevNetwork | DevNetwork [API + Cloud + AI] Hackathon 2026 — Aug 17– Sep 3, 2026 | Hybrid | Santa Clara, CA, Online | 🔒 | Jul 11, 2026 |
| 🔒 [CLOSED] | OneAquaHealth | OneAquaHealth IEEE Global Hackathon — Sep 16–30, 2026 | Virtual | Online | 🔒 | Jul 11, 2026 |
| 🔒 [CLOSED] | University of Waterloo | Hack the North — Sept 18–20, 2026 | In-Person | Toronto, ON | 🔒 | Jul 10, 2026 |
| 🔒 [CLOSED] | Carleton University | cuHacking 2026 — Jul 10 – Jul 12, 2026 | In-Person | Ottawa, ON | 🔒 | Jul 03, 2026 |
| 🔒 [CLOSED] | CS Girlies | CS Girlies Annual Hackathon - Technology For Wellness — Aug 14 – Aug 16, 2026 | Virtual | Online | 🔒 | Jul 03, 2026 |
| 🔒 [CLOSED] | AITHORS × Okareo | First Ever Agent Evalathon — Jul 6–13, 2026 | Virtual | Online | 🔒 | Jul 02, 2026 |
| 🔒 [CLOSED] | Ramp | Builders Cup 2026 (One-Day Hackathon for Students Graduating 2027+) | In-Person | New York, NY | 🔒 | Jul 02, 2026 |
| 🔒 [CLOSED] | HackBeanpot | HackBeanpot (Student Hackathon; Next Cycle Not Yet Posted) | In-Person | Boston, MA | 🔒 | Jun 29, 2026 |
| 🔒 [CLOSED] | Arya Health | Healthcare Hack NYC (Powered by Arya Health) | In-Person | New York, NY | 🔒 | Jun 28, 2026 |
| 🔒 [CLOSED] | Cerebral Valley | The Future of Agentic AI in Healthcare (Abridge × Anthropic × Lightspeed) | In-Person | San Francisco, CA | 🔒 | Jun 28, 2026 |
| 🔒 [CLOSED] | MIT | HackMIT 2026 (Weekend Hackathon; Open to Undergrads Worldwide) | In-Person | Cambridge, MA | 🔒 | Jun 27, 2026 |
| 🔒 [CLOSED] | Major League Hacking | Global Hack Week: Season Launch — Jul 10–16, 2026 | Virtual | Online | 🔒 | Jun 27, 2026 |
| 🔒 [CLOSED] | Major League Hacking | Midnight Virtual Hackathon — Jul 17–19, 2026 | Virtual | Online | 🔒 | Jun 27, 2026 |
| 🔒 [CLOSED] | Hack the 6ix | Hack the 6ix 2026 — Jul 17–19, 2026 | In-Person | Toronto, ON, Canada | 🔒 | Jun 27, 2026 |
| 🔒 [CLOSED] | Hexafalls | Hexafalls 2 — Jul 24–26, 2026 | In-Person | Kolkata, India | 🔒 | Jun 27, 2026 |
| 🔒 [CLOSED] | Major League Hacking | Global Hack Week: Agents — Aug 7–13, 2026 | Virtual | Online | 🔒 | Jun 27, 2026 |
| 🔒 [CLOSED] | XPRIZE | Build with Gemini XPRIZE — May 19 – Aug 17, 2026 | Virtual | Online | 🔒 | Jun 27, 2026 |
| 🔒 [CLOSED] | Devpost | H0: Hack the Zero Stack with Vercel v0 and AWS Databases — May 27 – Jun 29, 2026 | Virtual | Online | 🔒 | Jun 27, 2026 |
| 🔒 [CLOSED] | Qwen Cloud | Global AI Hackathon Series with Qwen Cloud — May 26 – Jul 20, 2026 | Virtual | Online | 🔒 | Jun 27, 2026 |
| 🔒 [CLOSED] | UiPath | UiPath AgentHack — May 15 – Jun 29, 2026 | Virtual | Online | 🔒 | Jun 27, 2026 |
| 🔒 [CLOSED] | Slack | Slack Agent Builder Challenge — May 20 – Jul 13, 2026 | Virtual | Online | 🔒 | Jun 27, 2026 |
| 🔒 [CLOSED] | Reddit's Games with a Hook Hackathon — Jun 17 – Jul 15, 2026 | Virtual | Online | 🔒 | Jun 27, 2026 | |
| 🔒 [CLOSED] | Arm | Arm Create: AI Optimization Challenge — Jun 4 – Aug 14, 2026 | Virtual | Online | 🔒 | Jun 26, 2026 |
| 🔒 [CLOSED] | Agentic AI Build Week | Agentic AI Build Week 2026 — Jun 9 – Jul 11, 2026 | In-Person | Ho Chi Minh City, Vietnam | 🔒 | Jun 26, 2026 |
| 🔒 [CLOSED] | Backblaze | Backblaze Generative Media Hackathon: Build with Genblaze on B2 — Jun 22 – Aug 3, 2026 | Virtual | Online | 🔒 | Jun 26, 2026 |
ℹ️ When a hackathon closes, it is moved here automatically. If you spot an event that has ended but is still listed as open in the README, please open a Close Hackathon issue.