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

2026 - F^3 Lake Half Marathon & 5k

Chicago, Illinois, United States View on map
Jan 31, 2026 (America/Chicago local time)
Running

2026 distances

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 CES. (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 31, 2026 Half-Marathon 10:00 AM
$125.00
Closed

5k

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

Jan 31, 2026 5K 10:30 AM
$80.00
Closed

Race-day weather

Conditions on January 31, 2026 — historical Open-Meteo data.

Temp (°C)
Minimum temperature (recorded on race day) -11.9° / Maximum temperature (recorded on race day) -3.7°
Feels Like (°C)
Minimum feels like — heat index / wind chill (recorded on race day) -21.0° / Maximum feels like — heat index / wind chill (recorded on race day) -10.5°
Peak wind (km/h)
Strongest wind of the day (recorded on race day)
23.6
Precip (mm)
Precipitation over the day (recorded on race day)
3.0mm
Humidity
Mean relative humidity (recorded on race day)
82.0%
Sunrise
Sunrise at the start line on January 31, 2026 (CST)
Sunset
Sunset at the start line on January 31, 2026 (CST)
Daylight
Hours between sunrise and sunset on race day
10h 00m

The sun rises at 7:03 AM and sets at 5:04 PM local time (CST) in Chicago on January 31, 2026 — 10h 00m 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, 150 Chicago events

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