Race Discovery
F^3 Lake Half Marathon & 5k
F^3 Lake Half Marathon & 5k logo

F^3 Lake Half Marathon & 5k

Chicago, Illinois, United States View on map
Jan 30, 2027 (America/Chicago local time)
Running

About this race

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

Pick your distance

Running

Half Marathon

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!

Jan 30, 2027 Half-Marathon 10:01 AM
$90.00
Open

5k

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

Jan 30, 2027 5K 10:29 AM
$59.00
Open

Typical race-day weather

Based on 4 years of Open-Meteo archive data for this event's race dates in Chicago, plus the 3 days either side.

Temp (°C)
Minimum temperature (race-week average) -8.3° / Maximum temperature (race-week average) -0.9°
Feels Like (°C)
Minimum feels like — heat index / wind chill (race-week average) -15.8° / Maximum feels like — heat index / wind chill (race-week average) -6.5°
Peak wind (km/h)
Strongest wind of the day (race-week average)
21.5
Precip (mm)
Precipitation over the day (race-week average)
1.8mm
Humidity
Mean relative humidity (race-week average)
74.9%
Sunrise
Sunrise at the start line on January 30, 2027 (CST)
Sunset
Sunset at the start line on January 30, 2027 (CST)
Daylight
Hours between sunrise and sunset on race day
9h 58m

The sun rises at 7:04 AM and sets at 5:02 PM local time (CST) in Chicago on January 30, 2027 — 9h 58m of daylight.

Course

No course map published yet.

The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.

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Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.

  • Entries, prices, waves and inclusions — the event's official registration page
  • Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
  • Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
  • Comparisons and counts — Race Discovery calendar, 149 Chicago events

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