Chicago 13.1
Race Day Weather
Comfortable temps
Starting at 61°F, heat will be a factor from the gun — go out conservative and stay on top of hydration. Light winds shouldn't be a major factor for pacing. Moderate humidity at 77% is worth noting for effort level, especially in later miles.
Pace Calculator
Enter a finish time to see what race day does to it.
Get forecast alerts for Chicago 13.1
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 Chicago 13.1 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 Chicago 13.1 starts and finishes in Garfield Park, looping through Humboldt Park and Douglass Park on Chicago's West Side. It's the half marathon leg of the Chicago Distance Series, run alongside the Chicago Marathon and Shamrock Shuffle. The course is flat, staying on West Side boulevards and parkways away from the lakefront route used by most Chicago races.
