18th Annual F^3 Lake Half Marathon & 5k

Saturday, January 30, 2027

10:01 AM CST

Chicago, Illinois

$59.55–$86.05 · 2 races

5km, Half Marathon

Event summary

Get ready for an exhilarating experience at the 18th Annual F^3 Lake Half Marathon & 5k, taking place on Saturday, January 30, 2027, in the heart of Chicago, Cook County. This iconic winter event is known as Chicago's Original Winter Half Marathon, attracting thousands of enthusiastic runners each year. Participants will gather at Soldier Field's United Club, where the atmosphere is warm and welcoming before they brave the elements along a scenic lakefront course, complete with splits every 5 km.

Whether you're gearing up for a spring marathon or simply looking to maintain your fitness goals, the F^3 Lake Half Marathon & 5k offers the perfect opportunity. Runners can look forward to receiving stylish hoodies and medals, adding to the excitement of the day. The half marathon kicks off at 10:01 a.m. with self-seeded waves, while the 5k follows shortly after at 10:29 a.m. With courses closing at 1:30 p.m., participants are encouraged to enjoy the post-race festivities at WEATHERMARK TAVERN, located at 1503 S. Michigan Ave. Don't miss out on this fantastic winter running tradition – register early, as spots have sold

Races

Half Marathon

Incl. $6.05 Fee & Where will you pick up your packet?

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!

10:01 AM CST

$86.05

Register
5k

Incl. $4.55 Fee & Where will you pick up your packet?

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

10:29 AM CST

$59.55

Register

Organiser's description

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