Haunted Hills 10K Redwood City

Haunted Hills 10K, held in Redwood City, California, blends Halloween fun with a competitive run on October 25, 2025. Runners choose the 10K or 5K course, weaving through neighborhoods decorated for the season. Participants form teams of 1–5 and carry headlamps or flashlights.

It's trick-or-treating for adults and families, with the 10K course featuring 36 checkpoints where entrants answer simple multiple-choice questions, adding a playful scavenger-hunt element to the race; the 5K has 20. The event emphasizes a festive, family-friendly atmosphere and community, culminating in refreshments and social time at the finish. For details, see the event website. Visit the organization's website for the most recent information.