Boulder Field 100

The Boulder Field 100 is a challenging trail running event held at Hickory Run State Park in Jim Thorpe, Pennsylvania. It offers three distances: a 100K ultra run, a 50K ultra run/mega hike, and an 18-mile run/hike. The course features a figure-8 shaped 50K loop, with 100K participants running the loop twice.

Runners encounter about 4,000 feet of elevation gain per 50K, a rugged boulder field crossing, and a demanding one-mile section known as the Shades of Death Trail. The terrain is mostly single-track and multi-use trails, with minimal gravel road. Time limits are 16 hours for the 100K and 14 hours for the 50K, making the shorter race accessible to hikers. Visit the organization's website for the most recent information.