Tunnel Hill 100
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Tunnel Hill 100
Tunnel Hill 100 is an out and back ultramarathon on the Tunnel Hill State Trail in Vienna, Illinois, running through the Shawnee National Forest. The trail is a converted rail corridor with a flat, fast crushed limestone surface and an overall 2% grade. The course includes an iconic 543 foot limestone Tunnel #1 and multiple turnaround points.
Distances offered:
- 100 Mile
- 100 km
- 50 Mile
- Marathon
Aid stations are located about every 5 miles and provide full nutrition including hot food overnight. No cups are provided on course, so runners must carry their own bottle or container. Some aid stops are unmanned water only and crew access varies by station. Drop bags are accepted at the start area and may be placed for locations identified as Karnak, Vienna, or Tunnel Hill; recommended bag size is roughly shoebox sized.
Pacers are permitted under event rules with a required pacer bib and fee; a single pacer is allowed at a time. The race enforces course rules such as no bicycles, strollers, dogs, or trekking poles in early miles, and requires bib visibility. Tunnel Hill hosted multiple world records and served as the 2026 USATF 50 Mile Championships. Prize money and bonuses are available for top placing and for new course or world records. Cutoff and race logistics are published in the race booklet and race details. Visit the organization's website for the most recent information.
