Halloween Havoc Half Marathon - Fountain Valley, CA

The Halloween Havoc Half Marathon in Fountain Valley, CA, is a festive running event that includes a 5K, 10K, and half marathon. Scheduled for October 26, 2025, participants are encouraged to don their spookiest costumes as they navigate the scenic loop course at Mile Square Park. The event promises a lively atmosphere with Halloween-themed music, candy at the finish line, and various surprises.

Runners can expect well-marked routes with on-course support, including water stations and restrooms. This event is perfect for both seasoned runners and those looking to enjoy a fun, community-oriented race. Visit the organization's website for the most recent information.