Tunnel Hill 100 & 50 Mile Runs
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Event overview
Tunnel Hill 100 takes place in Vienna, Illinois on November 8, 2025. The event offers multiple race distances:
- 100 miles
- 100 km
- 50 miles
- Marathon
The 2025 edition includes the USATF 50 Mile Road Championships. Championship competitors must be USATF members and U.S. citizens to be eligible for awards. Championship athletes are subject to U.S. Anti-Doping Agency testing. The event is USATF sanctioned and carries IAU certification and IAU Golden Label recognition for the 100 mile and 50 mile races.
Course, rules and race support
All races start and finish at Vienna City Park. The 50 mile course runs south to the Wetlands Center at 13.1094 miles, then north 25 miles to a northern turnaround and back 11.8906 miles to Vienna for a certified 50-mile loop; the 100 mile is two repeats. The 100km finish is at a certified turnaround past the first southern aid station. All main distances have a 30-hour time limit; 100 milers must begin their second 50 in under 15 hours.
Aid stations provide water, Tailwind, fresh fruit, sandwiches, hot foods later in the day, and minimal single-use cups; runners are advised to bring personal bottles. Registered pacers are allowed under stated rules and must wear a bib. Shoes must meet IAU rules (sole height not greater than 40 mm and no more than one carbon plate). Littering can result in disqualification. Visit the organization's website for the most recent information.