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F^3 Lake Half Marathon & 5k
F^3 Lake Half Marathon & 5k logo

F^3 Lake Half Marathon & 5k

Chicago, Illinois, United States
Jan 30, 2027
Running

About this race

The 18th Annual F^3 Lake Half Marathon & 5k is Chicago's Original Winter Half Marathon. Each year, thousands of runners flock to this community-built event, gathering in the warmth of Soldier Field's United Club before tackling wind & weather along a lakefront course that features splits every 5km. A must for anyone preparing for a spring marathon or just resolving to stay fit throughout the new year. F^3 sold out in 2016-2020 and 2023-present.

Every registrant will once again receive one of our great hoodies and a medal! We will return to the warm confines of Soldier Field's United Club! The UC opens at 8 a.m. Gear check is available. The half marathon starts at 10:01 a.m. and consists of self-seeded waves in quick succession. The 5k is scheduled for 10:29 a.m. Courses close at 1:30 p.m.

After the race, head to Weathermark Tavern for the afterparty! 1503 S. Michigan Ave. Free participant photos are always uploaded to flashframe.io

Pick your distance

Running

Half Marathon

Winter Half Marathon on a plowed & salted path. Finisher Medals. Hoody. Splits at 5km, 10km, 10M. Prize Money to top 5 Open Women & Men. Prize Money to top 3 Masters Women & Men. Pace groups provided by Fleet Feet Training. (1:30, 1:40, 1:50, 2:00, 2:10, 2:20, 2:30, 2:45, 3:00) Six aid stops along the route. (2.5, 3.6, 6, 8.1, 10.5, 11.6) Gather in the United Club! Post-race party at Weathermark Tavern!

Jan 30, 2027 Half-Marathon 10:01 AM
$70.00
Open

5k

Winter 5k on a plowed & salted path. Finisher Medals! Hoody! Post-race party at Weathermark Tavern! Gather in the United Club!

Jan 30, 2027 5K 10:29 AM
$49.00
Open

Typical race-day weather

Based on 4 years of historical conditions on this event's race dates in Chicago.

Temp (°C)
Minimum temperature (race-day average) -7.3° / Maximum temperature (race-day average) 0.2°
Feels Like (°C)
Minimum feels like — heat index / wind chill (race-day average) -14.7° / Maximum feels like — heat index / wind chill (race-day average) -5.2°
Wind (km/h)
Average wind speed (race-day average)
21.5
Precip (mm)
Average precipitation (race-day average)
5.0mm
Humidity
Average relative humidity (race-day average)
77.4%

About Chicago

F^3 Lake Half Marathon & 5k takes place in Chicago, Illinois, United States. The local timezone is America/Chicago.

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Race information has been sourced from the event's official website and other publicly available resources. For the most up-to-date details, please refer to the official website directly. If you notice any incorrect or missing information, don't hesitate to reach out to us by email.

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