Tunnel Hill 100 & 50 Mile Runs

Vienna, United States • 8 Nov 2025

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.

Race information

UTMB 50K UTMB 100K
100 mi
100 Mile
100 km
100 Km
50 mi
50 Mile
42 km
Marathon
Visit the organization's website for the most recent information.
Trail runs nearby

Run by moonlight to support Unity Christian cross country with 6k and 2k on an all grass course lit by a Super Moon and 200 solar lights. Enjoy unique awards, soup and sandwiches and be sure to wear lights for a fun glowing night run.

Run the scenic trails of Camp Ondessonk in Ozark Illinois with 5K and 10K options perfect for all abilities. Expect forest singletrack, friendly vibes and event shirts for early registrants.

Run Under The Stars Paducah invites runners to chase distance in a chip timed 10 hour endurance event on a lighted half mile oval at Carson Park, with distances from half marathon to ultra. A family friendly RUTS Kids Run welcomes ages 1 to..

Run the 1st Annual Sundown Showdown 5K cross country in Carterville IL on July 17, 2026. Team or individual runners will tackle a grassy course and compete for awards for top finishers and male, female, and mixed teams.

Tackle Shawnee Hills Trail Races at Camp Ondessonk in Ozark IL on Aug 22 and 23 2026. Choose from 100 mile to half marathon on hilly single track with creek crossings, night options and full aid.

Join The Last Boyscout at scenic Ferne Clyffe State Park, a Last Man Standing where you must run a 4.167 mile loop each hour to stay in. Enjoy runnable trails with two big climbs and optional night loops under headlamps.