Tech to Treasure Hackathon San Jose, CA, USA Code for a greener future. $450 in prizes Jun 1, 2026 46 participants
Hack Cupertino 2026 Cupertino, CA, USA A high-school hackathon organized by the Cupertino YAB and Cupertino's Recreation Department to give teens a chance to destress, be creative, and become civically engaged. Non-monetary prizes Apr 11 – 12, 2026 109 participants
Hack4Hope Los Angeles Los Angeles, CA, USA Make your Mark in the Fight Against Cancer with the American Cancer Society Cancer Action Network! $8,000 in prizes Jan 31 – Feb 6, 2026 80 participants
Sierra Hacks Manteca, CA, USA A 12-hour coding marathon where innovation meets collaboration! $21,930 in prizes Nov 15, 2025 81 participants
MountainHacks 2025 Mountain House, CA, USA Hack the Heights - A 12-hour hackathon for high-school students of all experience levels, taking place on November 8th at MHHS! $12,460 in prizes Nov 8, 2025 188 participants
Cal Hacks 12.0 San Francisco, CA, USA This year's Cal Hacks is co-hosted by Claude, Fetch AI, AppLovin, and Amazon's Annapurna Labs! Together we'll assemble in SF for a weekend of hacking, friendship, and crazy ideas. $58,100 in prizes Oct 24 – 26, 2025 2164 participants
LG Hacks 2.0 San Jose, CA, USA The second annual LG Hacks event at Leigh High School! $1,000 in prizes Oct 25, 2025 125 participants
CogniHacks (In Person Only Event) - Full Pleasanton, CA, USA Bringing Brain Computer Interface (BCI) Applications from clinical settings to commercial applications with AI. Must sign up at cognihacks.com/join to be a confirmed participant! $2,092 in prizes Aug 30, 2025 159 participants
Hack4Hope Make your Mark in the Fight Against Cancer with the American Cancer Society Cancer Action Network! $2,075 in prizes Aug 9, 2025 111 participants
LG Hacks San Jose, CA, USA High School Hackathon In Los Gatos $1,200 in prizes Mar 23, 2025 127 participants
DeveloperWeek 2025 Hackathon Santa Clara, CA, USA Join the nation's largest challenge-driven in-person and online hackathon @ DeveloperWeek 2025! $24,400 in prizes Jan 27 – Feb 13, 2025 1377 participants
MakerHacks San Francisco, CA, USA Design, create, and iterate in the largest high school robotics hackathon. $7,444 in prizes Feb 1 – 2, 2025 58 participants
Random Forest Hackathon Pleasanton, CA, USA Data and ML Hackathon For Students $700 in prizes Dec 21, 2024 – Jan 5, 2025 178 participants
Google Chrome Built-in AI Challenge Online Develop a web application or Chrome Extension that uses one or more Chrome built-in AI APIs to interact with integrated models such as Gemini Nano. $65,000 in prizes Winners announced 8499 participants
Smart City Hackathon Irongmara, India Dare to Hack !! $30,500 in prizes Sep 3 – Nov 27, 2024 887 participants
