Tunnel Hill 50M
Race Day Weather
Comfortable temps, warming through the race, moderate wind
Mild 51°F temps at gun time mean comfortable early miles without overheating risk. Temperatures rising to 63°F through the course will gradually increase perceived effort in the second half. Moderate winds around 15mph may affect pacing on open sections of the course.
Pace Calculator
Enter a finish time to see what race day does to it.
Get forecast alerts for Tunnel Hill 50M
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
Get your personalized Tunnel Hill 50M race plan
A mile-by-mile breakdown of where your time goes, weather-adjusted splits, fueling timeline with aid stations, packing checklist, carb tracker, spectator guide, all built around your goal and race-day conditions.
Race Info
The Tunnel Hill 50 Mile follows the Tunnel Hill State Trail out of Vienna, Illinois, running out-and-back to a southern turnaround at the Cache River State Natural Area's Wetlands Center and a northern turnaround beyond the community of Tunnel Hill, crossing the trail's namesake railroad tunnel twice. The route holds a grade under 2 percent over its converted rail-line profile. USATF and World Athletics certified, it has produced multiple 50-mile world records, including Anne Flower's 5:18:57 in 2025 and Charlie Lawrence's 4:48:21 in 2023.
