Date
October 11, 2026
Field Size
XL(>25,000)
Finishers
52,017 finishers
2024 results
Verified historical metrics based on 2024 results.
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A massive field size of 52,017 finishers provides an energetic and festive running environment.
The race takes place in early October, typically enjoying mild fall weather in Chicago.
This course is one of the flattest in the country, making it an enticing option for both casual runners and those looking to set personal records. The Chicago Marathon draws a huge crowd, with over 52,000 finishers, creating an electric atmosphere as you navigate through the city's iconic streets. Expect a well-organized event, with frequent hydration stations and enthusiastic spectators lining the route, providing motivation throughout the race.
BMQR course profile: Very Flat.
Aim to find a steady rhythm early on, utilizing the flat terrain to conserve energy. Stay aware of your pace, especially in the first half where you might be tempted to go out too fast due to the crowd and excitement.
No elevation data was found in the course profile file.
Historical average based on 3-year data for this race date
Temp
69.6°F / 50.1°F
Conditions
Rainy
Precipitation
0.17 in
Wind
12.2 mph
Historical averages · Source: Open-Meteo · Actual conditions will vary
Typical conditions: Cool (40–60°F), ideal racing conditions. Fall conditions are typically the most reliable for marathon efforts, with cool mornings that hold through the finish for most runners.
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