Tunnel Hill 100 & 50 Mile Runs

Vienna, United States • 8 Nov 2025

Tunnel Hill 100 & 50 Mile Runs take place in Vienna, Illinois along the Tunnel Hill State Trail. The event offers 100-mile and 50-mile distances on a crushed limestone trail, with wetlands, trestles, and a historic tunnel; the 100-mile course repeats the 50-mile loop four times, the 50-mile loop twice. It is USATF-sanctioned and IAU-certified, with 2024 UTMB index status and a Western States qualifier for 2026.

The 30-hour time limit applies to both distances; aid stations are spaced about every 3–5 miles and runners should carry fluids. Pacers are allowed under USATF rules, with restrictions for record attempts. Notable records include Herron’s 100-mile world mark and Olsen’s 50-mile record. Visit the organization's website for the most recent information.

Race information

100 mi
100 Mile
50 mi
50 Mile
Visit the organization's website for the most recent information.
Trail runs nearby

The Last Boyscout is a challenging Last Man Standing race held at Ferne Clyffe State Park in Goreville, Illinois. Participants run a 4.167-mile loop featuring single track trails, jeep roads, and paved sections, with about 600 feet of elevation gain per loop. The race tests endurance and resilience,..

Located at the SIU Touch of Nature Outdoor Education Center in Makanda, Illinois, the Rocky Ledges 5K/10K Trail Run/Walk offers two trail distances: 5K and 10K. The course unfolds through wooded and natural terrain, delivering a scenic, nature-rich atmosphere that welcomes individuals and teams of a..

Arrowhead Endurance Run takes place at Arrowhead Lake Campground in Johnston City, Illinois (about 15 minutes north of Marion). The course features a single certified 2.07-mile loop around the lake, mostly gravel with a short concrete section at the boat ramp, offering less than 50 feet of elevation..

Shawnee Hills Trail Races take place at Camp Ondessonk in Ozark, Illinois, inside Shawnee National Forest. The event offers 100 Mile, 100K, 50K, Half Marathon, and a Night 50K, with pacers permitted for the 100-mile and 100K distances only. The course is a figure-eight loop, about 80% single-track d..