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

Sat, Jan 30, 2027, 10:01 AM CST

Location: Chicago, IL; 1410 Special Olympics Drive, 60614
Type: RUN

Official registration Past results (if available)

Vibe analysis coming soon

Course feel, difficulty, and community fit are being added to this listing. Check back, and always confirm details on the official registration page.

Distances & registration

2 options

Registration for all distances is through the official signup link above.

5K
Sat, Jan 30, 10:29 AM CST · From $41.53
Opens Jan 29, 2026, 7:00 PM CST · Closes May 16, 2026, 7:59 PM CDT
13.1 Miles
Sat, Jan 30, 10:01 AM CST · From $61.67
Opens Jan 30, 2026, 7:00 PM CST · Closes May 17, 2026, 7:59 PM CDT

Vibe Check

Steady Effort

longer distance

Based on terrain, weather, and distance data.

The course

From the organizer

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

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