17th Annual F^3 Lake Half Marathon & 5k
- Date Sat 31st January 2026
- Time 10:00AM EST
- Location Chicago, Illinois
- Price $42.59 - $59.55
- Races 2 races
- Distances 5km, Half Marathon
Event summary
Get ready to lace up your running shoes for the 17th Annual F^3 Lake Half Marathon & 5k, taking place on Saturday, January 31, 2026, in the vibrant city of Chicago, Cook County. This exhilarating winter running event has become a beloved tradition, attracting thousands of enthusiastic participants each year. Gather at the cozy United Club in Soldier Field, where you'll prepare to tackle a scenic lakefront course that includes splits every 5 kilometers. The half marathon kicks off at 10 a.m., followed by the 5k at 10:30 a.m., both featuring self-seeded waves to ensure a smooth start for all runners.
This event is perfect for those gearing up for a spring marathon or anyone committed to staying active in the new year. With a history of selling out from 2016 to 2020 and again in 2023 and beyond, registration is highly sought after! All participants will receive a stylish hoodie and a finisher's medal to commemorate their achievement. Once you've crossed the finish line, celebrate your accomplishment at the afterparty at WEATHERMARK TAVERN, located at 1503 S. Michigan Ave. Don’t miss this fantastic opportunity to embrace winter running and enjoy
This event is perfect for those gearing up for a spring marathon or anyone committed to staying active in the new year. With a history of selling out from 2016 to 2020 and again in 2023 and beyond, registration is highly sought after! All participants will receive a stylish hoodie and a finisher's medal to commemorate their achievement. Once you've crossed the finish line, celebrate your accomplishment at the afterparty at WEATHERMARK TAVERN, located at 1503 S. Michigan Ave. Don’t miss this fantastic opportunity to embrace winter running and enjoy
Organiser's Description
The 17th 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 a.m. and consists of self-seeded waves in quick succession. The 5k is scheduled for 10:30 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
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 a.m. and consists of self-seeded waves in quick succession. The 5k is scheduled for 10:30 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
Races
-
Half Marathon
Incl. $4.55 Fee & Where Will You Pick Up Your Packet?
Sat 31st January 2026 (10:00AM EST)
$59.55
OPENS SOONWinter 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 CES. (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! -
5k
Incl. $3.59 Fee & Where Will You Pick Up Your Packet?
Sat 31st January 2026 (10:30AM EST)
$42.59
OPENS SOONWinter 5k on a plowed & salted path. Finisher Medals! Hoody! Post-race party at Weathermark Tavern! Gather in the United Club!
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