ZombieRunner Halloween Marathon

San Jose, CA, USA · October 31, 2026
partly-cloudy-day52°·67° high·Calm·Dry
7
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Race Day Weather

partly-cloudy-day
52°at start
71° high
Calm
Dry
Your goal
0:00:00

Cool start, warming trend ahead

Runners will face a temperature rise from 52°F at the start to 71°F by the finish, with average humidity at 57%. Wind will be light, mostly crosswind, which should not significantly impact pacing. As temperatures climb, it's advisable for runners to start conservatively and adjust their hydration strategy, especially in the later laps.

Race day forecast available in 3 days
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Pace Calculator

26.2mi
0:00:00
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Race Plan

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 Pace
Weather Splits
Nutrition
Gear & Packing
T-Minus
Carb Tracker
Spectator Guide
Race Band

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.

Race weekend

Saturday, October 31
8:20 AMKids Run
8:30 AMMarathon (26.2 mi)
8:30 AMHalf Marathon (13.1 mi)
8:45 AM10K (6.2 mi)
8:55 AM5K (3.1 mi)

FAQ

When is the 2026 ZombieRunner Halloween Marathon?

The 2026 ZombieRunner Halloween Marathon will be held on Saturday October 31, 2026.

Is the ZombieRunner Halloween Marathon a Boston Marathon Qualifier?

Yes, the ZombieRunner Halloween Marathon is an official Boston Marathon qualifier.

What will the weather be like for the 2026 ZombieRunner Halloween Marathon?

The forecast calls for a high of 74°F and a low of 52°F with a 3% chance of rain.

Historical Weather

Based on 3 years of data
Avg Temp
59°F
L:51° H:66°
RunScore
8
Conditions
Rain Freq
0%
0 of 3 yrs
Wind3mph
Dew42°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2025
partly-cloudy-day
51°/65°-
7
2024
partly-cloudy-day
55°/65°-
7
2023
clear-day
47°/69°-
9