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18th Annual F^3 Lake Half Marathon & 5k
Saturday, January 30, 2027 · Chicago, IL
The race in 60 seconds
It is one of 16 races on the Illinois calendar that January. At $38, entry sits above the $30 median for an Illinois half marathon.
What race day usually feels like
Based on the last three years, race week in January typically sees lows near 23°F and highs around 37°F: cold start, dress in layers you can shed. Weather normals computed from Chicago-area conditions for race week, not the nearest big city.
Pacing the Half Marathon
Overall average pace for the Half Marathon, aid and rest stops included. Find your band before the start and let the first miles feel too easy.
| Finish time | Average pace | Feels like |
|---|---|---|
| 1:32 | 7:00 /mi | Front of the field |
| 2:04 | 9:30 /mi | Strong, steady effort |
| 2:37 | 12:00 /mi | Comfortable and conversational |
| 3:16 | 15:00 /mi | Every finish counts |
Common questions
When is 18th Annual F^3 Lake Half Marathon & 5k?
18th Annual F^3 Lake Half Marathon & 5k is scheduled for Saturday, January 30, 2027.
Where is 18th Annual F^3 Lake Half Marathon & 5k held?
18th Annual F^3 Lake Half Marathon & 5k is held in Chicago, Illinois. It is about 36 miles from Aurora.
What distances does 18th Annual F^3 Lake Half Marathon & 5k offer?
The listed distances are Half Marathon, 5K.
How much does 18th Annual F^3 Lake Half Marathon & 5k cost?
Entry is listed from $38. Check the official race page for the current price, which usually rises closer to race day.
How do I register for 18th Annual F^3 Lake Half Marathon & 5k?
Registration is handled on the official race page, linked at the top of this listing. Entry can close early if the race sells out.
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See every race on the Illinois calendar, all Chicago races, Illinois Half Marathons, Illinois 5Ks, or use the Race Finder for maps and filters.
Register for 18th Annual F^3 Lake Half Marathon & 5k →on RunSignUp · entry from $38
Listing data refreshed nightly from the registration platform. Photos via Wikimedia Commons (CC BY 2.0, CC BY-SA 2.0). Last template review July 2026. Spot an error? Tell us and we'll fix it fast.