The Blue 2 Blue Challenge

West Rock, United States • 4 May 2025

The Blue 2 Blue Challenge is a demanding 50K trail race held in New Haven, Connecticut, known as the state's hardest 50K, covering approximately 33 miles of technical terrain. The out-and-back course starts at West Rock Playground and features rugged trails including the Regicides and Quinnipiac Blue-Blazed Trails, with about 6,350 feet of climbing. Runners navigate rocky, challenging paths, summiting Mt.

Sanford and passing notable landmarks like Roaring Brook Park. The race has a strict 10-hour cutoff, no pacers or crews allowed, and multiple aid stations along the route. It requires prior trail 50K experience, emphasizing a tough, graduate-level challenge for seasoned runners. Visit the organization's website for the most recent information.

Race information

50 km
6350 m+
50k
Visit the organization's website for the most recent information.
Trail runs nearby

The Spring Fling 600 is an annual trail running event hosted by the CT Trailmixers at YMCA Camp Sloper in Southington, Connecticut. The event features two main races: the 600-minute race where participants run as many loops as possible on a roughly three-mile trail course within 10 hours, and a 6-mi..

The Run Ragged Last Person Standing event, hosted by the CT Trailmixers, is an exciting endurance race set in the rugged terrain of Ragged Mountain, Berlin, CT. Participants will tackle a challenging 3.11-mile loop, with one hour to complete each lap. The race continues until only one runner remains..

The 16th Annual Farmington River Run 5K Trail Race is scheduled for May 18, 2025, at Winding Trails in Farmington, Connecticut. This scenic race takes place on a designated 5K trail within a 300-acre area surrounding Walton Pond. Participants can compete for awards in various categories, including o..

The Mine Hill Half Marathon, held in Roxbury, Connecticut, is known as the toughest road half marathon in the state. Starting and finishing at the scenic Mine Hill Distillery, the challenging 13.1-mile course features a mix of paved and dirt roads with significant elevation changes, including a stee..

The Flanders Field & Forest 5K is an annual trail run and walk held at Flanders’ Van Vleck Farm & Nature Sanctuary in Woodbury. Covering 3.1 miles of scenic trails, the event welcomes participants of all ages and fitness levels. It is officially timed and features divisions for different age groups,..

The Ansonia Six Hour Trail Run is a challenging endurance event held at the Ansonia Nature Center in Ansonia, Connecticut. Participants run counter-clockwise loops of approximately 1.9 miles on moderately technical singletrack trails featuring about 170 feet of elevation gain per loop. The course of..