Tunnel Hill 100 & 50 Mile Runs

Event Overview

The Tunnel Hill 100 & 50 Mile Runs take place on the Tunnel Hill State Trail in Vienna, Illinois. The event includes distances of 100 miles, 100 km, 50 miles (which is also the 2026 USATF 50 Mile Road Championships), and a marathon. The course is a certified, point-to-point route on a crushed limestone trail with minimal elevation change.

Course Details

The race starts and finishes at Vienna City Park. All distances share the same start time. The course runs south to a turnaround at the Wetlands Center and north to a separate northern turnaround. Runners pass through a historic 600-foot tunnel. The 100-mile race consists of two 50-mile loops. The 100 km race follows the 50-mile course plus an additional southern out-and-back section. The marathon is an out-and-back to the southern turnaround. The course is sanctioned by USATF and holds IAU Golden Labels for the 100-mile and 50-mile events.

Event Features

The time limit for the 100-mile, 100 km, and 50-mile distances is 30 hours. Pacers are allowed for 100-mile runners in the final 24 miles or after dark. Aid stations provide water, hydration drink, and food. Drop bags are available at specified locations. The event is a Western States 100 qualifier and a UTMB index race.

Awards and Records

Prize money is awarded for top finishers and course records. The event has been the site of multiple world and American records. All finishers receive a custom belt buckle (for 100-mile, 100 km, and 50-mile distances) or a medal (for the marathon). Entrants receive event swag like a hoodie and running cap. Visit the organization's website for the most recent information.