18th Annual F^3 Lake Half Marathon & 5k - 5k
Also in this race
These events were grouped as one card in discovery—pick another distance or date without going back.
External Event
Distance
3.1 mi
Pace
All paces
Terrain
Road
Difficulty
All Levels
About this run
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
Typical conditions
For events around January 2027 in Chicago, IL, United States: Typical mid-winter / cooler season in this region — dress in layers and check the official page for weather-related changes.
How to prepare
Most runners can prepare for a 5K with a few weeks of easy runs and one short faster session per week. Focus on consistency, not volume, and rest the day before race day.
Beginner's guide to your first 5KGetting there
This event is listed in Chicago, IL, United States. Confirm the exact start venue, parking, and transit options on the official registration page.
Registration is handled by the official event organizer
Know a local group? Host a community run in Chicago
Also in this race
- Jan 30, 2027 · 4:01 PM
- Jan 30, 2027 · 4:29 PM (this one)
