Chicago Marathon

Chicago, United States of America 12 Oct, 2025

The Chicago Marathon is a large annual road race held in the city of Chicago, Illinois, typically occurring on the first or second Sunday of October. The event hosts approximately 40,000 runners, making it one of the largest marathons globally.

The course forms a loop through downtown Chicago and many neighborhoods, covering a standard marathon distance of 42.195 kilometers (26.22 miles). The route is characterized by minimal elevation changes, with a total elevation gain of about 243 feet (74 meters). The maximum elevation reaches approximately 612 feet (186 meters), and the minimum sits at 580 feet (176 meters). The course is consistently flat, without notable hills or steep inclines, distinguishing it from other major marathons known for challenging elevation profiles.

As a result of its flat terrain and optimal typical weather conditions, the Chicago Marathon is considered one of the fastest major marathons in the United States. It regularly yields a high percentage of runners qualifying for the Boston Marathon, with 14% qualifying in the previous year. The event’s organization is well managed, featuring multiple corrals at the start, frequent hydration and energy stops, and a strictly controlled bag drop system for participants.

The race environment includes long, straight segments and passes parks and city landmarks. Despite its large size, runners generally do not experience crowding that impedes pace, and the marathon is noted for strong spectator and volunteer support throughout the route. All running occurs on city streets, with no sections on trails, country roads, or dirt paths.

Notable facts include:
– The marathon is part of the World Marathon Majors series.
– Historically, it has been one of the top two largest marathons in the U.S.
– Weather during the event is usually within the ideal range for endurance running.
– Entry is managed by a lottery system or through charity fundraising commitments.

The overall difficulty of the Chicago Marathon is rated as *low to moderate* relative to other world major marathons, due mostly to its flat profile and effective race support.

Generic Marathon Time This represents the time you would expect to run a "generic" marathon in. This is a marathon with around 250 m (800 ft) of elevation gain and a temperature around 10°C (50°F). For best results, use our Race Predictor.

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Chicago Marathon Time


Statistics

Elevation
Elevation Gain 75 m 246 ft
Elevation Low 176 m 577 ft
Elevation High 193 m 633 ft
Weather
Expected Temperature (Low) 11°C 51°F
Expected Temperature (High) 18°C 64°F
Chance of Rain 0%

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The Chicago Marathon is a large annual road race held in the city of Chicago, Illinois, typically occurring on the first or second Sunday of October. The event hosts approximately 40,000 runners, making it one of the largest marathons globally.

The course forms a loop through downtown Chicago and many neighborhoods, covering a standard marathon distance of 42.195 kilometers (26.22 miles). The route is characterized by minimal elevation changes, with a total elevation gain of about 243 feet (74 meters). The maximum elevation reaches approximately 612 feet (186 meters), and the minimum sits at 580 feet (176 meters). The course is consistently flat, without notable hills or steep inclines, distinguishing it from other major marathons known for challenging elevation profiles.

As a result of its flat terrain and optimal typical weather conditions, the Chicago Marathon is considered one of the fastest major marathons in the United States. It regularly yields a high percentage of runners qualifying for the Boston Marathon, with 14% qualifying in the previous year. The event’s organization is well managed, featuring multiple corrals at the start, frequent hydration and energy stops, and a strictly controlled bag drop system for participants.

The race environment includes long, straight segments and passes parks and city landmarks. Despite its large size, runners generally do not experience crowding that impedes pace, and the marathon is noted for strong spectator and volunteer support throughout the route. All running occurs on city streets, with no sections on trails, country roads, or dirt paths.

Notable facts include:
– The marathon is part of the World Marathon Majors series.
– Historically, it has been one of the top two largest marathons in the U.S.
– Weather during the event is usually within the ideal range for endurance running.
– Entry is managed by a lottery system or through charity fundraising commitments.

The overall difficulty of the Chicago Marathon is rated as *low to moderate* relative to other world major marathons, due mostly to its flat profile and effective race support.

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