17th Annual F^3 Lake Half Marathon & 5k

🏃‍♂️ Event Overview

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.

🎽 Participant Information

• Hoodies and Medals: Every registrant will once again receive one of our great hoodies and a medal!
• Location: We will return to the warm confines of Soldier Field's United Club!
• Gear Check: Available for participants.
• Event Times: 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 Party

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

📅 Event Details

• Date: 2026-01-31
• Location: 1410 Special Olympics Drive, Chicago, IL
• Website: F^3 Lake Half Marathon & 5k