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

Jan 30, 2027Chicago, IL, United States

Also in this race

These events were grouped as one card in discovery—pick another distance or date without going back.

Viewing13.1 mi · Jan 30, 2027

Switch to3.1 mi · Jan 30, 2027

External Event

Distance

13.1 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

Half marathon prep usually includes a weekly long run that builds toward 16–20 km, plus easy runs for recovery. Confirm packet pickup and start procedures on the official registration page.

Plan longer races for 2026