The World's Premier
Speed Course.
Home to 5 World Records and the 2026 USATF 50 Mile Road Championships.
Your Race Starts Here
Register
Secure your spot for the 2026 edition. 100 Mile, 100km, 50 Mile & Marathon distances available.
Register Now →Volunteer
Join our elite team of 200+ volunteers. Aid stations, timing, and course marshaling roles.
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Real-time GPS tracking for all runners. Follow your athlete mile-by-mile on race day.
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"The fastest course in ultrarunning. Period."
— UltraRunning MagazineWhere Records Come to Fall
The crushed limestone surface and consistent 2% grade have produced some of the fastest times in ultrarunning history.
Crushed Limestone.
Zero Excuses.
The Tunnel Hill State Trail is a converted rail corridor running through the Shawnee National Forest in Southern Illinois. The surface is flat, fast crushed limestone with a maximum grade of just 2%.
- Out-and-back through the Shawnee National Forest
- Consistent 2% grade — no hills, no altitude
- Aid stations every ~5 miles with full nutrition
- Iconic Tunnel #1 — a 543-foot limestone passage
