Chicago Marathon 2025
Chicago · October 12, 2025 · 54,296 finishers
- Where the field cracked
- 30 km
- Negative splits
- 11.2%
- Median finish
- 4:12:56
- Finishers
- 54,296
Largest drop in pace between two mats.
Share of the field that ran the second half faster.
Fade, by finish time
Fade tracks ability, so a single field-wide median would compare you against people running a different race. Each band below is the median for runners who finished near your time.
| Band | Median fade |
|---|---|
| <3:00 | 2.5% |
| 3:00-3:30 | 4.4% |
| 3:30-4:00 | 5.6% |
| 4:00-4:30 | 9.5% |
| 4:30-5:00 | 12.1% |
| >5:00 | 16.5% |
Race conditions
- Temp.
- 10.6°C – 18.0°C
- Humidity at peak
- 58%
- Wind
- 6 km/h – 12 km/h
Temperature ran from 10.6°C to 18.0°C. At its hottest, the air was at 58% humidity.
Hour by hour
| Hour | Temp. | Humidity | Wind |
|---|---|---|---|
| 07:00 | 10.6°C | 90% | 8 km/h |
| 08:00 | 10.7°C | 87% | 7 km/h |
| 09:00 | 11.8°C | 80% | 6 km/h |
| 10:00 | 13.1°C | 75% | 6 km/h |
| 11:00 | 14.5°C | 69% | 7 km/h |
| 12:00 | 15.8°C | 66% | 8 km/h |
| 13:00 | 17.2°C | 63% | 10 km/h |
| 14:00 | 17.9°C | 59% | 9 km/h |
| 15:00 | 18.0°C | 58% | 10 km/h |
| 16:00 | 17.9°C | 59% | 11 km/h |
| 17:00 | 17.2°C | 64% | 12 km/h |
| 18:00 | 16.6°C | 72% | 9 km/h |
| 19:00 | 16.8°C | 72% | 11 km/h |
Hourly data from open-meteo. Peak wind 12 km/h. Times in the race's own zone.