Illinois · Half Marathon · 5K
F^3 Lake Half Marathon & 5K
F^3 Lake Half Marathon & 5K is a half marathon and 5K event held in Chicago, Illinois. Its next confirmed date is Saturday, January 30, 2027. About 4,500 runners take part across all distances.
- Race day
- January 30, 2027
- Location
- Chicago, IL
- Field size
- ~4,500 runners
Race details
- Date
- Saturday, January 30, 2027
- Location
- Chicago, Illinois
- Distances
- Half Marathon, 5K
- Field size
- About 4,500 runners
- Course
- Flat
- Registration
- runsignup.com
- Official website
- f3running.com
Registration, course & weather
- Registration status
- Open
- Start time
- 10:01 AM CST
- Course profile
- Out-and-back course; Road surface; USATF certified
- Typical race-day weather
- about 20°F at the start, 88% humidity, 10 mph wind (based on the 2026 race day, measured near the city center rather than the exact start line; Open-Meteo, checked October 2, 2026)
About the F^3 Lake Half Marathon & 5K
Chicago's original winter half marathon (plus 5K), staging out of Soldier Field's United Club before a flat, windy lakefront course. It draws several thousand cold-weather runners and regularly sells out.
Rankings and notes
- Rankings and awards
- USATF-certified; Chicago's original winter half marathon; routinely sells out
More half marathons in Illinois
Coming up next, by confirmed date.
-
Springfield Marathon & Harvest Wind Half Marathon & 10KNew Berlin, ILMarathonHalf Marathon10K ~1,403 runners
More races in Chicago
More upcoming races in Illinois
Keep exploring
- All races in Illinois
- 5Ks in Illinois 190 upcoming races
- 10Ks in Illinois 68 upcoming races
- Half Marathons in Illinois 37 upcoming races
- Marathons in Illinois 12 upcoming races
- Running in Chicago 48 upcoming races
- 5Ks in the United States 6,417 upcoming races
- Half Marathons in the United States 1,828 upcoming races
- Winter Half Marathons
- January Half Marathons
- January races in Illinois
- Half Marathons in Missouri 43 upcoming races
- Half Marathons in Wisconsin 39 upcoming races
- Half Marathons in Indiana 24 upcoming races
- Half Marathons in Iowa 22 upcoming races
Guides from the RaceRove blog
- 8 min read How to Choose the Best Half Marathon for a PR, Racecation or 50-State Challenge The best half marathon depends on what you want from it. How to choose a course for a personal record, a race worth travelling for, or an efficient stop on a 50-state challenge.
- 7 min read How to Find a 5K, 10K, Half Marathon or Marathon Near You A practical way to find running races near you: pick a distance, decide how far you'll travel, read the listing properly and confirm the details before you register.
- 9 min read How to Run a Race in All 50 States How to plan a 50-state running challenge: set your own rules, group states into trips, build a calendar around the seasons, budget for it and keep track of every finish.
- Blog All guides Planning advice for finding, choosing and travelling to races.
F^3 Lake Half Marathon & 5K: common questions
- When is the F^3 Lake Half Marathon & 5K?
- The next confirmed date is Saturday, January 30, 2027.
- Where is the F^3 Lake Half Marathon & 5K held?
- In Chicago, Illinois.
- What distances does the F^3 Lake Half Marathon & 5K offer?
- Half Marathon and 5K.
- How many people run the F^3 Lake Half Marathon & 5K?
- About 4,500 runners across all of its distances. That figure is an estimate of the field size, not an entry cap.
- How do I register for the F^3 Lake Half Marathon & 5K?
- Registration is handled by the organiser at runsignup.com. Entry fees, caps and deadlines are set there.
- Is registration open for the F^3 Lake Half Marathon & 5K?
- Yes — registration is open. Listed fee for the longest distance, $70 (from runsignup.com, checked October 2, 2026).
- What time does the F^3 Lake Half Marathon & 5K start?
- 10:01 AM CST.
- What is the course like at the F^3 Lake Half Marathon & 5K?
- Out-and-back course; Road surface; USATF certified.
- What is race-day weather usually like at the F^3 Lake Half Marathon & 5K?
- about 20°F at the start, 88% humidity, 10 mph wind (based on the 2026 race day, measured near the city center rather than the exact start line; Open-Meteo, checked October 2, 2026).
Plan this race in RaceRove
Save it to your plan, compare it with other races, check typical race-day weather and track your 50-state progress in the interactive app.