DiamondHacks 2026 San Diego, CA, USA San Diego's Largest Hackathon $25,710 in prizes Apr 4 – 5, 2026 366 participants
HackHayward 2026 Hayward, CA, USA Build With AI and an Entrepreneurial Eye Non-monetary prizes Mar 21 – 22, 2026 122 participants
Los Altos Hacks VII Sunnyvale, CA, USA The largest hackathon in the world for high schoolers. $42,164 in prizes Apr 8 – 9, 2023 348 participants
