ZombieRunner Halloween Marathon
Race Day Weather
Cool start, steady climb ahead
Runners will face a temperature increase from 50°F at the start to 64°F by finish, with an average humidity of 63%. A light N wind at 11 mph may create some variability, but its impact is minimal given the flat course. As temperatures rise later in the race, maintaining hydration and adjusting pace conservatively will be crucial for optimal performance.
Pace Calculator
Enter a finish time to see what race day does to it.
Get forecast alerts for ZombieRunner Halloween Marathon
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
Get your personalized ZombieRunner Halloween Marathon race plan
A mile-by-mile breakdown of where your time goes, weather-adjusted splits, fueling timeline with aid stations, packing checklist, carb tracker, spectator guide, all built around your goal and race-day conditions.
Race Info
The ZombieRunner Halloween Marathon is a costume-friendly road race held each Halloween weekend at Hellyer County Park in San Jose, California. Runners choose from a marathon, half marathon, 10K or 5K, all following a flat, paved route along the Coyote Creek Trail to Metcalf Park and back. The event is organized by Walnut Creek-based Coastal Trail Runs, which stages roughly 30 races a year across the Bay Area. Both the marathon and half marathon courses are USATF certified.
